OWNER’SMANUALALLISON3000 MH4000 MH

ATD 5376 Op Manual 200302 2/6/03 1:54 PM Page 1

Owner’sManual

3000MH, MHR, MHP, MHPR4000MH, MHR, MHP, MHPR

October 2002

OM3349EN

Printed in the USA Copyright © 2002 General Motors Corp.

Division of General Motors CorporationP.O. Box 894 Indianapolis, Indiana 46206-0894www.allisontransmission.com

2

NOTES

TABLE OF CONTENTS

INTRODUCTIONKEEPING THAT ALLISON ADVANTAGE . . . . . . . . . . . . . . . . . . . . . . . . 7

A BRIEF DESCRIPTION OF THE ALLISON 3000MH, 4000MH SERIESTRANSMISSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

WTEC III ELECTRONIC CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . 10

TORQUE CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

PLANETARY GEARS AND CLUTCHES . . . . . . . . . . . . . . . . . . . . . . . . 14

COOLER CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

RETARDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

SHIFT SELECTORSDESCRIPTION OF AVAILABLE TYPES . . . . . . . . . . . . . . . . . . . . . . . . . 15

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

LEVER SHIFT SELECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

PUSHBUTTON SHIFT SELECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

DRIVING TIPSCHECK TRANS LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

DIAGNOSTIC CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

ACCELERATOR CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DOWNSHIFT AND DIRECTION CHANGE INHIBITOR FEATURE . . . . . . . 23

USING THE ENGINE TO SLOW THE VEHICLE. . . . . . . . . . . . . . . . . . . 24

USING THE HYDRAULIC RETARDER . . . . . . . . . . . . . . . . . . . . . . . . . 25

RANGE PRESELECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

ADAPTING SHIFTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

COLD WEATHER STARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

DRIVING ON SNOW OR ICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

ROCKING OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

HIGH FLUID TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

PARKING BRAKE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

TOWING OR PUSHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

CRUISE CONTROL OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

TURNING OFF THE VEHICLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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POWER TAKEOFF OPERATIONENGINE-DRIVEN POWER TAKEOFF (PTO) . . . . . . . . . . . . . . . . . . . . . 34

CARE AND MAINTENANCEPERIODIC INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

PREVENT MAJOR PROBLEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

IMPORTANCE OF PROPER FLUID LEVEL. . . . . . . . . . . . . . . . . . . . . . 36

FLUID LEVEL CHECK USING THE PUSHBUTTON OR LEVER SHIFTSELECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

MANUAL FLUID CHECK PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . 38

COLD CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

HOT CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

RECOMMENDED AUTOMATIC TRANSMISSION FLUID AND VISCOSITYGRADE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

KEEPING FLUID CLEAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

FLUID AND INTERNAL FILTER CHANGE INTERVALRECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

TRANSMISSION FLUID CONTAMINATION . . . . . . . . . . . . . . . . . . . . . 46

TRANSMISSION FLUID AND FILTER CHANGE PROCEDURE. . . . . . . . . 47

DIAGNOSISDIAGNOSTIC CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

DIAGNOSTIC CODE DISPLAY PROCEDURE. . . . . . . . . . . . . . . . . . . . . 51

DIAGNOSTIC CODE LISTINGS AND PROCEDURES. . . . . . . . . . . . . . . . 53

ABBREVIATIONS AND DEFINITIONSABBREVIATIONS AND DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . 64

CUSTOMER SERVICEOWNER ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

SERVICE LITERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

ALLISON TRANSMISSION DISTRIBUTORS . . . . . . . . . . . . . . . . . . . . . 69

ALLISON TRANSMISSION REGIONAL OFFICES. . . . . . . . . . . . . . . . . . 72

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TRADEMARK USAGEThe following trademarks are the property of the companies indicated:

• DEXRON® is a registered trademark of the General Motors Corporation.

• TranSynd™ is a trademark of Castrol Ltd.

• Allison DOC™ is a trademark of General Motors Corp.

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WARNINGS, CAUTIONS, NOTESIT IS YOUR RESPONSIBILITY to be completely familiar with the warningsand cautions described in this handbook. It is, however, important to understandthat these warnings and cautions are not exhaustive. Allison Transmission couldnot possibly know, evaluate, and advise the service trade of all conceivable waysin which service might be done or of the possible hazardous consequences of eachway. The vehicle manufacturer is responsible for providing information related tothe operation of vehicle systems (including appropriate warnings, cautions, andnotes). Consequently, Allison Transmission has not undertaken any such broadevaluation. Accordingly,ANYONE WHO USES A SERVICE PROCEDUREOR TOOL WHICH IS NOT RECOMMENDED BY ALLISONTRANSMISSION OR THE VEHICLE MANUFACTURER MUST first bethoroughly satisfied that neither personal safety nor equipment safety will bejeopardized by the service methods selected.

Proper service and repair is important to the safe, reliable operation of theequipment. The service procedures recommended by Allison Transmission (or thevehicle manufacturer) and described in this handbook are effective methods forperforming service operations. Some of these service operations require the use oftools specially designed for the purpose. The special tools should be used whenand as recommended.

Three types of headings are used in this manual to attract your attention. Thesewarnings and cautions advise of specific methods or actions that can result inpersonal injury, damage to the equipment, or cause the equipment to becomeunsafe.

WARNING: A warning is used when an operating procedure, practice,etc., if not correctly followed, could result in personal injury or loss oflife.

CAUTION: A caution is used when an operating procedure, practice,etc., if not strictly observed, could result in damage to or destruction ofequipment.

NOTE: A note is used when an operating procedure, practice, etc., isessential to highlight.

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KEEPING THAT ALLISON ADVANTAGE

HILL

SPEEDZONE

R R

STOP

Y I E L D

V01724

Allison MH Series transmissionsprovide many advantages for the driver whomust “stop and go” or change speeds frequently. Driving is easier, safer, and moreefficient.

The MH Series transmissionsare rugged and designed to provide long,trouble-free service. This handbook will help you gain maximum benefits fromyour ALLISON -equipped vehicle.

INTRODUCTIONM H S E R I E S

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OUTPUTSPEED

SENSOR

NAMEPLATE

INPUTSPEEDSENSOR

ASSEMBLY PADS

MAIN-PRESSURE TAPNOTE: Inch Series Threads

BREATHER

FEEDTHROUGH HARNESSCONNECTOR

COOLER PORTSNOTE: Inch Series Threads

V06341

ASSEMBLY PADS(BOTH SIDES)

BREATHER

MAIN-PRESSURE TAPNOTE: Inch Series Threads

FEEDTHROUGH HARNESSCONNECTORTORQUE CONVERTER

WITH LOCKUP CLUTCHAND TORSIONAL DAMPER

FILL TUBE AND DIPSTICK(Available on both sides)

Figure 1. Typical 3000MH Series Transmission

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TURBINE SPEEDSENSOR

MOUNTINGPAD

INPUT SPEEDSENSOR

NAMEPLATE

FILL TUBE AND DIPSTICKOUTPUT SPEED

SENSOR

FEEDTHROUGHHARNESS

CONNECTOR

V06342

COOLER PORTS

MAIN-PRESSURE TAP

MOUNTING PAD(BOTH SIDES)

COOLER PORTS

FEEDTHROUGHHARNESSCONNECTOR

BREATHER

BREATHER

Figure 2. Typical 4000MH Series Transmission

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A BRIEF DESCRIPTION OF THE ALLISON 3000MH,4000MH SERIES TRANSMISSIONSIncluded in the Allison On-Highway Transmission family are the 3000MH and4000MH Series transmissions. The transmissions described in this handbookinclude the WTEC III control system, a torque converter with lockup clutch andtorsional damper, and three planetary gear sets. These transmissions may alsocontain an integral retarder (the R in the model name) or power takeoff (PTO, theP in the model name).

WTEC III ELECTRONIC CONTROL SYSTEMThe WTEC III control system is standard on all 3000MH and 4000MH Series.The system consists of five major components connected by OEM-furnishedwiring harnesses—Electronic Control Unit (ECU), engine throttle position sensor(or direct electronic communication), three speed sensors, remote shift selector,and control module (which contains solenoid valves and a pressure switch). Thethrottle position sensor (or engine-to-transmission communication link), speedsensors, pressure switch, and shift selector transmit information to the ECU. TheECU processes this information and then sends signals to actuate specificsolenoids located on the control module in the transmission. These solenoidscontrol both oncoming and offgoing clutch pressures to provide closed-loop shiftcontrol by matching rpm during a shift to a previously established desired profilethat is programmed into the ECU.

A feature of WTEC III controls is “autodetect.” Autodetect is active within thefirst several engine starts, depending upon the component or sensor being detected.These engine start cycles begin from when the transmission is installed duringvehicle manufacture. Autodetect searches for the presence of the followingtransmission components or data inputs:

Retarder Present, Not PresentOil Level Sensor (OLS) Present, Not PresentThrottle Analog, J 1587, J 1939

Engine Coolant Temperature Analog, J 1939, J 1587

Seek help from your nearest Allison Transmission service outlet when any of theabove items are present, but are not responding properly.

Another feature of the 3000MH and 4000MH Series transmission is its ability toadapt or “learn” as it operates. Each shift is measured electronically, stored andused by the ECU to adapt or “learn” the optimum conditions for future shifts.

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NOTE: If the shift quality of low mileage vehicles, or vehicles withnew or recalibrated ECUs is unacceptable, follow the procedureexplained in the ADAPTING SHIFTS paragraph.

NOTE: Allison WTEC III electronic control systems are designed andmanufactured to comply with all FCC and other guidelines regardingradio frequency interference/electromagnetic interference (RFI/EMI) fortransportation electronics. Manufacturers, assemblers, and installers ofradio-telephone or other two-way communication radios have the soleresponsibility to correctly install and integrate those devices into Allison3000MH and 4000MH Series transmission-equipped vehicles tocustomer satisfaction.

The ECU is programmed to provide the most suitable operating characteristics fora specific application. This handbook does not attempt to describe all of thepossible combinations. The information contained herein describes only theoperating characteristics most frequently requested by the vehicle manufacturer.

TORQUE CONVERTERThe torque converter consists of three elements—pump, turbine, and stator. Thepump is the input element and is driven directly by the engine. The turbine is theoutput element and is hydraulically driven by the pump. The stator is the reaction(torque multiplying) element. When the pump turns faster than the turbine, thetorque converter is multiplying torque. When the turbine approaches the speed ofthe pump, the stator starts to rotate with the pump and turbine. When this occurs,torque multiplication stops and the torque converter functions as a fluid coupling.

The lockup clutch is located inside the torque converter and consists of threeelements—piston, clutch plate/damper, and backplate. The piston and backplateare driven by the engine. The clutch plate/damper, located between the piston andthe backplate, is splined to the converter turbine. The lockup clutch is engagedand released in response to electronic signals from the ECU. Lockup clutchengagement provides a direct drive from the engine to the transmission gearing.This eliminates converter slippage and provides maximum fuel economy andvehicle speed. The torsional damper absorbs engine torsional vibrations to preventtheir transmission through the powertrain.

The lockup clutch releases at lower speeds or when the ECU detects conditionsrequiring it to be released.

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OIL

LEV

EL S

ENSO

R

P2 M

ODU

LE

P1 M

ODU

LE

CONV

ERTE

R M

ODU

LE• T

URBI

NE• P

UMP

• LO

CKUP

CLU

TCH/

DAM

PER

• STA

TOR

CONV

ERTE

R H

OUS

ING

MO

DULE

• CO

NVER

TER

HO

USIN

GRO

TATI

NG C

LUTC

H M

ODU

LE• C

1 C

LUTC

H• C

2 C

LUTC

H• T

URBI

NE S

HAFT

CONT

ROL

MO

DULE

• ELE

CTRO

-HYD

RAUL

IC C

ONT

ROLS

MAI

N S

HAFT

MO

DULE

• MAI

N S

HAFT

• P2

SUN

• P3

SUN

MAI

N HO

USIN

G M

ODU

LE• M

AIN

HO

USIN

G• C

3 CL

UTCH

• C4

CLUT

CH• C

5 CL

UTCH

FRO

NT S

UPPO

RT/O

IL P

UMP

MO

DULE

• FRO

NT S

UPPO

RT• O

IL P

UMP

REAR

CO

VER

MO

DULE

• OUT

PUT

SHA

FT• P

3• C

5 P

ISTO

N

V033

48.0

2

Figure 3. Typical 3000MH Series Transmission Cross Section

12

ROTA

TING

CLU

TCH

MO

DULE

C

1 C

LUTC

H

C2

CLU

TCH

T

URBI

NE S

HAFT

CONT

ROL

MO

DULE

E

LECT

RO-H

YDRA

ULIC

CO

NTRO

LS

P1 M

ODU

LE

P2 M

ODU

LE

MAI

N H

OUS

ING

MO

DULE

M

AIN

HO

USIN

G

C3

CLU

TCH

C

4 C

LUTC

H

C5

CLU

TCH

MAI

N S

HAFT

MO

DULE

M

AIN

SHA

FT

P2

SUN

P

3 S

UN

REAR

CO

VER

MO

DULE

O

UTPU

T S

HAFT

P

3 M

ODU

LE

C5

PIS

TON

V063

43

CONV

ERTE

R M

ODU

LETU

RBIN

EPU

MP

STAT

OR

LOCK

UPCL

UTCH

/DAM

PER

CONV

ERTE

R H

OUS

ING

MO

DULE

CONV

ERTE

R H

OUS

ING

FRO

NT S

UPPO

RT/O

IL P

UMP

MO

DULE

FRO

NT S

UPPO

RT

OIL

PUM

P

Figure 4. Typical 4000MH Series Transmission Cross Section

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PLANETARY GEARS AND CLUTCHESA series of three helical planetary gear sets and shafts provides the mechanicalgear ratios and direction of travel for the vehicle. The planetary gear sets arecontrolled by five multiplate clutches that work in pairs to produce six forwardspeeds and one reverse speed. The clutches are applied and released hydraulicallyin response to electronic signals from the ECU to the appropriate solenoids.

COOLER CIRCUITThe transmission fluid is cooled by an integral (transmission-mounted) or remotemounted oil cooler. Connections to the cooling circuit are located at the front orrear of the transmission to facilitate installation of remote cooler lines. On shallowsump models, only rear ports are available. On retarder models, only rear coolerports may be used. The integral cooler is located on the lower rear portion of thetransmission, replacing the remote cooler manifold. Integral cooler oil ports areinternal requiring only coolant to be routed to and from the cooler.

RETARDERThe self-contained retarder is at the output of the transmission and consists of avaned rotor which rotates in a vaned cavity. The rotor is splined to and driven bythe output shaft. An external accumulator holds transmission fluid until theretarder is activated. When the retarder is activated, the fluid in the accumulator ispressurized by the vehicle air system and directed into the retarder cavity. Theinteraction of the fluid with the rotating and stationary vanes causes the retarderrotor and output shaft to reduce speed, slowing the vehicle or limiting speed on adownhill grade. Refer to USING THE HYDRAULIC RETARDER for additionalinformation.

When the retarder is deactivated, the retarder cavity is evacuated and theaccumulator is recharged with fluid.

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DESCRIPTION OF AVAILABLE TYPES

INTRODUCTIONVehicle manufacturers may choose different types of shift selectors for theirvehicles. The shift selector in your Allison-equipped vehicle will be similar to thelever style or the pushbutton style shown above.

With an Allison-equipped vehicle, it is not necessary to select the right moment toupshift or downshift during changing road and traffic conditions. The Allison MH

1

2

3

4

5

D

N

RMODE

R

N

D

5

4

3

2

1MODE

21 3 D N RR

N

D

MODE

RND

1

2

3

4

5

D

N

RMODE

R

N

D

MODE

V07343

SIX-SPEED,LEFT-HAND

LEVER SELECTOR

SIX-SPEED,RIGHT-HAND

LEVER SELECTOR

HOLD OVERRIDE BUTTON

DISPLAY MODE/DIAGNOSTIC BUTTON

MODE ID

DIGITAL DISPLAY

MODE BUTTON

MODE INDICATOR(LED)

MODE ID

MODEINDICATOR (LED)

Push simultaneouslyto enter diagnostic

mode and fluid level check

NOTE: Number displayed is highest forward range available in selected position.Visually check to confirm range selected. If display is flashing – shift is inhibited.

✽

DIGITAL DISPLAY

STRIPPUSHBUTTON

SHIFTSELECTORS

PUSHBUTTONSELECTORS

✽

HOLD OVERRIDE BUTTON

DISPLAY MODE/DIAGNOSTIC BUTTON

DIGITAL DISPLAY

MODE BUTTONMODE ID

MODE INDICATOR(LED)

✽

CONTOUREDVERSION

Figure 5. Typical WTEC III Shift Selectors

SHIFT SELECTORSM H S E R I E S

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Series does it for you. However, knowledge of the shift selector positions, rangesavailable, and when to select them, will make vehicle control even easier. Selectlower ranges when descending long grades (with and without retarder) to reducewear on service brakes. Be sure to read the RANGE SELECTION table forrelated information.

LEVER SHIFT SELECTOR

General Description.The lever shift selector is an electro-mechanical control.The typical lever positions provided areR (Reverse),N (Neutral),D (Drive) andsome number of lower forward range positions. The MH Series transmissions canbe programmed to have four, five, or six forward ranges. The shift selectorpositions provided should agree with the programming of the transmissionelectronic control unit. The lever selector contains a hold override button, aMODE button, a digital display, and a display mode button.

Hold Override Button. The lever shift selector has three locked positions toprevent accidentally selectingR (Reverse)),N (Neutral), orD (Drive). SelectR,N, or D by pressing the hold override button and moving the lever to the desiredposition. OnceD (Drive) is selected, lower forward range positions may beselected without pressing the hold override button.

MODE Button. The MODE button may allow the driver to enable a secondaryshift schedule or other special function that has been previously programmed intothe electronic control unit at the request of the OEM. For example, the OEM for amotor home may have provided a secondary shift schedule for improved fueleconomy. The name of the special function (ECONOMY) should appear on theMODE ID label adjacent to theMODE button. Pressing theMODE buttonactivates the ECONOMY shift schedule and illuminates the MODE INDICATOR(LED). Other special functions which may be activated by theMODE button areD1 selection or PTO enable. TheMODE button is also used to view diagnosticcode information. Refer to the DIAGNOSIS section for further explanation. Afterviewing the first diagnostic code which appears in the digital display, press theMODE button to view the 2nd diagnostic code logged. Repeat this procedure toview the 3rd, 4th, and 5th code positions. The code displayed is active when theMODE INDICATOR (LED) is illuminated.

NOTE: Visually check the digital display whenever the lever is movedto be sure that the range selected is shown (i.e., ifN (Neutral) isselected,N should appear in the digital display).

Digital Display. During normal operation, whenD (Drive) is selected, the digitaldisplay shows the highest forward range attainable for the shift schedule in use.Abnormal operation is also indicated by the digital display. When all segments of

16

the digital display are illuminated for more than 12 seconds, the ECU did notcomplete initialization. When the digital display is blank, there is no power to theselector. When the display shows a “\/\” (cateye), a selector-related fault code hasbeen logged. Conditions which illuminate the CHECK TRANS light will disablethe shift selector and the digital display will show the range actually attained. SeeCHECK TRANS LIGHT paragraph for more information. The transmission willnot shift into range if a CHECK TRANS code is active. When the display showsthat eitherR or D has been requested and the display is flashing, the requestedrange has not been achieved due to an inhibit function. Some inhibit functions arevehicle related and will not result in diagnostic codes. Some examples arementioned in the Range Selection section which follows. Check for active codes ifno other inhibit function has been located. Refer to the DIAGNOSIS section forinformation on accessing codes using the shift selector. OnceD (Drive) isattained, the transmission will shift into the lowest range programmed for theD (Drive) position, usually first.

Display Mode/Diagnostic Button.Allows access to optional fluid level checkinformation and diagnostic code information. Press the display mode/diagnosticbutton once to obtain transmission fluid level information (when oil level sensor ispresent) and a second time to obtain diagnostic code information.

PUSHBUTTON SHIFT SELECTOR

General Description.The pushbutton shift selector hasR, N, D, ↓ , ↑ , a MODEbutton, and a digital display.

R Pushbutton. Press this button to select Reverse.

N Pushbutton. Press this button to select Neutral.

D Pushbutton. Press this button to select Drive. The highest forward rangeavailable will appear in the digital display window. The transmission will start outin the lowest available forward range and advance automatically to the highestrange.

↓ , ↑ (Arrow) Buttons. When a lower range is desired, afterD (Drive) has beenpressed, press the↓ (Down) arrow button until the desired range is shown in thedisplay window. Likewise, if the transmission is held in a low range by the↓(Down) arrow, press the↑ (Up) arrow to request the next higher range.Continuous pressing of either the↑ (Up) or ↓ (Down) arrow buttons will requestthe highest or lowest range available. Access fluid level data and diagnostic codeswith the pushbutton selector by pressing the↑ (Up) and↓ (Down) arrow buttonsat the same time. Refer to CHECK TRANS LIGHT, or DIAGNOSIS section for

17

further information. Fluid level information is displayed (if optional oil levelsensor is present) after the first simultaneous press. Press both buttons again toobtain diagnostic data.

MODE Button and Digital Display. Same function as described inMODEButton paragraph andDigital Display paragraph for the lever shift selector.

RANGE SELECTION — PUSHBUTTON AND LEVER SHIFTSELECTORS WITH DIGITAL DISPLAY

WARNING: If you leave the vehicle and the engine is running,the vehicle can move unexpectedly and you or others could beinjured. If you must leave the engine running, do not leave thevehicle until you have completed all of the following procedures:

• Put the transmission inN (Neutral)• Ensure that the engine is at low idle (500–800 rpm)• Apply the parking brake and emergency brake and make sure

they are properly engaged• Chock the wheels and take any other steps necessary to keep

the vehicle from moving.

WARNING: R (Reverse) may not be obtained due to anactive inhibitor. Always apply the service brakes whenselectingR (Reverse) to prevent unexpected vehiclemovement and because a service brake inhibit can be present.Always be sure that “R” is not flashing wheneverR (Reverse)is selected. Check for active diagnostic codes ifR (Reverse) isnot attained.

CAUTION: Do not idle inR (Reverse) for more thanfive minutes. Extended idling inR (Reverse) can causetransmission overheating and damage. Always selectN (Neutral)whenever time at idle exceeds five minutes.

NOTE: Visually check the digital display window whenever abutton is pushed or the lever is moved to be sure that the rangeselected is shown (i.e., if theN (Neutral) button is pressed,Nshould appear in the digital display). A flashing display indicatesthat the range selected was not attained due to an active inhibit.

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RANGE SELECTION — PUSHBUTTON AND LEVER SHIFTSELECTORS WITH DIGITAL DISPLAY

R Completely stop the vehicle and let the engine return to idle beforeshifting from a forward range toReverse or fromReverse to aforward range. The LED window on theReverse pushbutton willilluminate andReverse will be attained.

WARNING: When starting the engine, make sure the servicebrakes are applied. Failure to apply the service brakes can resultin unexpected vehicle movement.

WARNING: To help avoid injury or property damage caused byunexpected vehicle movement, do not make shifts to or fromN (Neutral) without manually or automatically applying anappropriate vehicle brake.

WARNING: DO NOT allow the vehicle to “coast” inN (Neutral). There is no engine braking inN (Neutral). Youcould lose control of the vehicle, causing property damage orpersonal injury. Coasting in neutral can cause severe transmissiondamage.

N UseNeutral when you start the engine, to check vehicle accessories,and for extended periods of engine idle operation (longer than fiveminutes). For vehicles equipped with the pushbutton selector,Neutral is automatically set by the ECU during startup. For vehiclesequipped with the lever selector, the vehicle will not start untilNeutral has been manually selected. If the vehicle starts in anyrange other thanNeutral, seek service immediately.Neutral is alsoused during stationary operation of the power takeoff (if yourvehicle is equipped with a PTO). The digital display will showNwhenNeutral is selected. Be sure to selectN (Neutral)) beforeturning off the vehicle engine.

19

RANGE SELECTION — PUSHBUTTON AND LEVER SHIFTSELECTORS WITH DIGITAL DISPLAY

WARNING: Even thoughD (Drive) is selected, it may not beattained due to an active inhibitor. Always apply the servicebrakes when selectingD (Drive) to prevent unexpected vehiclemovement and because a service brake inhibit can be present.Always be sure that “D” is not flashing wheneverD (Drive) isselected. Check for active diagnostic codes ifD (Drive) is notattained.

CAUTION: Do not idle inD (Drive) or any forward range formore than five minutes. Extended idling inD (Drive) can causetransmission overheating and damage. Always selectN (Neutral)whenever time at idle exceeds five minutes.

NOTE: Turn off the vehicle HIGH IDLE switch, if present, beforeshifting from N (Neutral) toD (Drive) or R (Reverse).D (Drive) orR (Reverse) will not be attained unless the shift is made with theengine at idle. Also, be aware of other interlocks that would preventobtainingD (Drive) or R (Reverse). Examples are “wheelchair liftnot stored” and “service brakes not applied” (service brake interlockpresent).

D* The transmission will initially attain first range whenDrive isselected. As speed increases, the transmission automatically upshiftsthrough each range. As the vehicle slows, the transmissionautomatically downshifts. The light on theDrive pushbutton willilluminate and the appropriate range ofDrive will be attained.

WARNING: To avoid loss of control, use a combination ofdownshifting, braking, and other retarding devices. Downshiftingto a lower transmission range increases engine braking and canhelp you maintain control. The transmission has a feature toprevent automatic upshifting above the lower range selected.However, during downhill operation, if engine governed speed isexceeded in the lower range, the transmission will upshift to thenext higher range to prevent engine damage. This will reduceengine braking and could cause a loss of control. Apply thevehicle brakes or other retarding device to prevent exceedingengine governed speed in the lower range selected.

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RANGE SELECTION — PUSHBUTTON AND LEVER SHIFTSELECTORS WITH DIGITAL DISPLAY

6*5*4*32

Occasionally, road conditions, load, or traffic conditions make itdesirable to restrict automatic shifting to a lower range. Lowerranges provide greater engine braking for going down grades (thelower the range, the greater the braking effect).The pushbutton selector arrow buttons select individual forwardranges. Push the↑ (Up) or ↓ (Down) arrow to the desired range.The digital display shows your choice of range. Even though alower range is selected, the transmission may not downshift untilvehicle speed is reduced (this prevents excessive engine speed in thelower range).

1 Use this range when pulling through mud and deep snow, whenmaneuvering in tight spaces, or while driving up or down steepgrades. First range provides the vehicle with its maximum drivingtorque and maximum engine braking effect. For vehicles equippedwith the pushbutton selector, push the↓ (Down) arrow until firstrange appears in the select window.

* Actual ranges available depend on programming by vehicle manufacturer.

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CHECK TRANS LIGHTThe electronic control system is programmed to inform the operator of a problemwith the transmission system and automatically takes action to protect theoperator, vehicle, and transmission. When the Electronic Control Unit (ECU)detects a problem condition, the ECU restricts shifting, turns on the CHECKTRANS light on the instrument panel, and registers a diagnostic code.

NOTE: For some problems, diagnostic codes may be registered withoutthe ECU activating the CHECK TRANS light. Consult your AllisonTransmission authorized service outlet whenever there is atransmission-related concern. They have the equipment to check fordiagnostic codes and to correct problems which arise.

Each time the engine is started, the CHECK TRANS light illuminates, then turnsoff after a few seconds. This momentary lighting is to show that the status lightcircuits are working properly. If the CHECK TRANS light does not illuminateduring ignition, or if the light remains on after ignition, check the systemimmediately.

Continued illumination of the CHECK TRANS light during vehicle operation(other than start-up) indicates that the ECU has signaled a diagnostic code.Illumination of the CHECK TRANS light is accompanied by a flashing displayfrom the shift selector. The shift selector display will show the actual rangeattained and the transmission will not respond to shift selector requests.

The indications from the shift selector inform the operator that the transmission isnot performing as designed and is operating with reduced capabilities. Beforeturning the ignition off, the transmission may be operated for a short time in theselected range in order to “limp home” for service assistance. Service should beperformed immediately in order to minimize the potential for damage to thetransmission.

When the CHECK TRANS light comes on and the ignition switch is turned off,the transmission will remain inN (Neutral) until the condition causing theCHECK TRANS light is corrected.

M H S E R I E S

DRIVING TIPS

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Generally, while the CHECK TRANS light is on, upshifts and downshifts will berestricted and direction changes will not occur. Lever and pushbutton shiftselectors do not respond to any operator shift requests while the CHECK TRANSlight is illuminated. The lockup clutch is disengaged when transmission shifting isrestricted or during any critical transmission malfunction.

DIAGNOSTIC CODESSee detailed information in the DIAGNOSIS section.

ACCELERATOR CONTROL

WARNING: To avoid injury or property damage caused by suddenmovement of the vehicle, do not make shifts fromN (Neutral) to aforward range orR (Reverse) when the throttle is open. The vehicle willlurch forward or rearward and the transmission can be damaged. Avoidthis condition by making shifts fromN (Neutral) to a forward range orR (Reverse) only when the throttle is closed and service brakes areapplied.

The position of the accelerator pedal influences the timing at which automaticshifting occurs. When the pedal is fully depressed, upshifts will occurautomatically at high engine speeds. A partially depressed position of the pedalwill cause the upshifts to occur at lower engine speeds. An electronic throttleposition signal tells the ECU how much the operator has depressed the pedal.Excessive throttle position affects directional change shifts (shifts fromN (Neutral) toD (Drive) or R (Reverse)).

DOWNSHIFT AND DIRECTION CHANGE INHIBITORFEATURE

NOTE: Turn off the vehicle HIGH IDLE switch, if present, beforeshifting from N (Neutral) toD (Drive) or R (Reverse). The shift fromN (Neutral) toD (Drive) or R (Reverse) is inhibited when engine speedis above idle.

There is no speed limitation on upshifting, but there is on downshifting and forshifts which cause a direction change such asD (Drive) to R (Reverse) orR (Reverse) toD (Drive).

Manual range downshifts will not occur until a calibration value of output speed isreached. When a range downshift is manually selected and the transmission outputspeed is above the calibration value, the transmission will stay in the range it wasin even though a lower range was requested. Apply the vehicle service brakes or

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some retarding device to reduce the transmission output speed to the calibrationvalue and then the shift to the lower range will occur.

Directional shifts,D (Drive) to R (Reverse) orR (Reverse) toD (Drive), will notoccur if selected when throttle position, engine speed, or transmission outputspeed is above the calibration limit for a calibration time period. The currentcalibration time period for engine speed is 0.5 seconds and for throttle positionand output speed is three seconds.

Shifts fromN (Neutral) toD (Drive) or R (Reverse) are also inhibited when theECU has been programmed (by input/output function) to detect that auxiliaryequipment is in operation and the shift should not be allowed.

When a directional shift is inhibited, the ECU will put the transmission inN (Neutral) and the digital display, if present, will flash the letter of the rangeselected (D or R). ReselectD (Drive) or R (Reverse) when engine throttle, enginespeed, and transmission output speed are below the calibration value. With apushbutton selector, just depress the desired pushbutton again. With a leverselector, move the lever toN (Neutral) and then to the desired range.

When a direction change shift is requested and the engine throttle, engine speed,and transmission output speed drop below the calibration value during thecalibration time interval, the shift toD (Drive) or R (Reverse) will occur. Forexample, if the transmission output speed was just above the calibration limitwhenR (Reverse) was selected, but dropped below the limit during the nextthree seconds, the shift toR (Reverse) would occur (assuming that engine was atidle and throttle was closed).

USING THE ENGINE TO SLOW THE VEHICLE

WARNING: To avoid loss of control, use a combination ofdownshifting, braking, and other retarding devices. Downshifting to alower transmission range increases engine braking and can help youmaintain control. The transmission has a feature to prevent automaticupshifting above the lower range selected. However, during downhilloperation, if engine governed speed is exceeded in the lower range, thetransmission will upshift to the next higher range to prevent enginedamage. This will reduce engine braking and could cause a loss ofcontrol. Apply the vehicle brakes or other retarding device to preventexceeding engine governed speed in the lower range selected.

To use the engine as a braking force, select the next lower range. If the vehicle isexceeding the maximum speed for this range, use the service brakes and/orretarder to slow the vehicle. When a lower speed is reached, the ECU willautomatically down-shift the transmission.

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Engine braking provides good speed control for going down grades. When thevehicle is heavily loaded, or the grade is steep, it may be desirable to preselect alower range before reaching the grade. If engine-governed speed is exceeded, thetransmission will upshift automatically to the next range.

USING THE HYDRAULIC RETARDER

WARNING: To avoid injury and/or property damage caused by loss ofvehicle control, DO NOT USE THE RETARDER DURINGINCLEMENT WEATHER OR WHEN ROAD SURFACES ARESLIPPERY. De-energize the retarder at the retarder enable switch.

WARNING: To avoid injury or property damage caused by loss ofvehicle control, be ready to apply vehicle brakes or other retardingdevice if the transmission retarder does not apply. If a retarder is presentbut is not detected by “autodetect”, the retarder will not function. Besure to check for proper retarder function periodically. Whenever theretarder does not apply, seek service help immediately.

NOTE: On vehicles which have the primary retarder control based uponclosed throttle position, brake pedal position, or brake apply pressure,always manually disable the retarder controls during inclement weatheror slippery road conditions.

Regardless of the type of Allison retarder controls on your vehicle, the followingsafety features are common to each configuration:

• The retarder can be disabled when inclement weather or slippery roadconditions are present.

• Vehicle brake lights should always be on when the retarder is applied(periodically verify that they are working).

• Anti-lock brake systems send a signal to the transmission ECU to indicatethat the brake system is activated.

NOTE: The retarder is automatically disabled (and the lockup clutch isdisengaged) whenever the vehicle ABS (anti-lock brake system) isactive. However, in case the ABS system malfunctions, it isrecommended that the retarder enable switch, if present, be disabled.

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A hydraulic retarder is available on all of the models covered in this manual. Theretarder is activated and controlled in various ways. The control depends upon thevehicle type and particular duty cycle. Both manual and automatic controls areavailable. Automatic controls are applied by the ECU. Some types of controls andthe amount of retarder application are shown in theTypes of Retarder Controltable.

The presence of a retarder must be “autodetected” as part of the WTEC III controlsystem.

NOTE: If your transmission has a retarder but it is not functioning, itmay not have been “autodetected” during vehicle manufacture. Goimmediately to your nearest Allison Transmission service outlet to have“autodetect” reset or the retarder enabled.

NOTE: When reduced retarder performance is observed, be sure thatthe transmission fluid level is within the operating band on the dipstick.Low fluid level is a common cause for retarder performance complaints.

NOTE: The retarder requires about one second to reach full capacity.Be sure to anticipate this delay when using the retarder. Anticipationwill prevent unnecessary service brake applications duringnon-emergency stops.

Types of Retarder Control

Type Description Amount of ApplicationManual Separate apply

pedalZero to Full apply

Hand lever* Six levels based on lever positionAutomatic Auto “Full On” * “Full On” when closed throttle sensedBrake PressureApply **

Single pressureswitch

Off or “Full On” (based on brakepressure)

Three pressureswitches

1/3,2/3, or “Full On” (based on brake

pressure)Pedal Position ** Special brake

pedal

1/3,2/3, or “Full On” (based on pedal

position)

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Types of Retarder Control (cont’d)

Type Description Amount of ApplicationCombinations ofthe above systems**

Auto “half-on”plus pressureswitch *

Half capacity at closed throttle or“Full On” with brake pressure

Auto “1/3 on” plustwo pressureswitches *

1/3 capacity at closed throttle or2/3and “Full On” with brake pressure

Hand lever pluspressure switch *

6 levels of modulation with lever, or“Full On” with brake pressure

Foot pedal pluspressure switch

Full modulation with separate pedal,or “Full On” with brake pressure

Hand lever plusinterface forspecial pedal *

6 levels of modulation with lever, or 3levels of modulation based on pedalposition

* These control systems may apply the retarder at high speed on grades whenthe vehicle has road speed limiting and the retarder is enabled.** For retarder apply systems integrated with the service brake system, theretarder is most effective when applied with light brake pedal pressure for1–2 seconds to allow the retarder to fully charge. Added pedal pressure can beapplied when more aggressive braking is desired.

Contact your vehicle manufacturer to understand how the retarder controls havebeen integrated into your vehicle.

CAUTION: Prevent retarder-equipped transmission damage byfollowing these guidelines:

• OBSERVE TRANSMISSION AND ENGINE TEMPERATURELIMITS AT ALL TIMES.

• Select the lowest possible transmission range to increase thecooling system capacity and total retardation available.

• In the event of OVERHEATING, DECREASE THE USE OF THERETARDER; USE THE SERVICE BRAKES TO SLOW THEVEHICLE.

• OBSERVE THE RETARDER/SUMP “OVERTEMP” LIGHT tomake sure it responds properly to retarder temperature.

NOTE: Transmission oil level must be set correctly for highest retardereffectiveness. As much as 2 liters (2 quarts) too high or too low canreduce retarder effectiveness and increase transmission temperature.

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RANGE PRESELECTIONRange preselection means selecting a lower range to match driving conditions youencounter or expect to encounter. Learning to take advantage of preselected shiftswill give you better control on slick or icy roads and on downgrades.

Downshifting to a lower range increases engine braking. The selection of a lowerrange often prevents cycling between that range and the next higher range on aseries of short up-and-down hills.

NOTE: Preselecting during normal operation may result in reduced fueleconomy.

ADAPTING SHIFTSWhen poor shift quality is due to the installation of a new or recalibrated ECU,use the following procedure to restore good shift quality by completing aprescribed number of shifts in a relatively short time instead of over several daysof operation.

NOTE: Shift concerns may indicate the transmission has never had theshifts fully adapted.

Adaptive does not function below 100 degrees Fahrenheit transmission sumptemperature. Normal running hot sump temperature is recommended before thisprocedure is followed.

Check transmission sump level and assure it is set to “Hot Full” at normal runninghot sump temperature before this procedure is followed.

All segments of this procedure are to be repeated aminimum of 5 times or untilshift quality variation is indistinguishable from shift to shift.

1. From Neutral, with parking brake set and service brakes applied via footpedal, select the following sequence: Drive, Neutral, Reverse, Neutral,Drive, Reverse, Drive, Neutral. Allow each shift to fully complete beforeselecting the next shift.

2. Release all brakes and perform this sequence: Wide Open Throttle (WOT)1–2; once shift is complete, release the throttle to closed and decelerate tojust prior to the Closed Throttle (CT) 2–1 and perform a Step Thru (ST)2–1 by going to WOT.

3. Continue the process initiated in Step 2 for each Upshift and Downshiftcombination available. Example: Wide Open Throttle (WOT) 2–3; onceshift is complete, release the throttle to closed and decelerate to just prior

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to the Closed Throttle (CT) 3–2 and perform a Step Thru (ST) 3–2 bygoing to WOT. Repeat for the WOT 3–4/ST 4–3, WOT 4–5/ST 5–4, WOT5–6/ST 6–5.

4. From a Stop, release vehicle brakes and perform a set of Part Throttle(PT—50 to 60 percent) Upshifts to the highest attainable range for thevehicle. Release the throttle to closed and use light vehicle brakes todecelerate to a stop.

NOTE: If the vehicle is equipped with an output retarder or enginebrake system, these systems should be turned off for this segment.

5. From a Stop, release vehicle brakes and perform Part Throttle (PT—50 to60 percent) Upshifts to the 3rd range. Release the throttle to closed and,using moderate to heavy vehicle brakes (NOT panic or wheel lock),decelerate to a stop.

NOTE: Braking should be aggressive but not to the level that wouldcause passenger complaints. If the vehicle is equipped with an outputretarder or engine brake system, these systems should be turned off forthis segment.

6. From a Stop, release vehicle brakes and perform a set of Wide OpenThrottle Upshifts to the highest attainable range for the vehicle. Releasethe throttle to Closed and Preselect Down to 1st Range using the shiftselector. Use light vehicle brakes to decelerate to a stop.

7. If the vehicle is equipped with a retarder or engine brake, turn that systemon for this segment. From a Stop, release vehicle brakes and perform a setof Wide Open Throttle Upshifts to the highest attainable range for thevehicle. Release the throttle to Closed and, using Light vehicle brakes andthe retarder or engine brake, decelerate vehicle to a stop.

NOTE: Allison Transmission does not recommend using the vehiclebrakes to “force” Powered Downshifts (PD, downshifts with the throttleapplied). If grades are available, these should be used to adapt in WOTand PT Powered Downshifts.

8. Approach the grade in the highest safely attainable range and hold thethrottle steady at WOT and allow the vehicle to perform the PoweredDownshifts as required to ascend the grade.

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9. Approach the grade in the highest safely attainable range and hold thethrottle steady at Part Throttle (PT—50 to 60 percent) and allow thevehicle to perform the Powered Downshifts as required to ascend thegrade.

COLD WEATHER STARTSAll 3000MH and 4000MH transmissions are programmed to restrict full operationuntil specific temperatures are reached. Refer to the following chart fortemperature restrictions.

Sump Oil TemperatureCHECK

TRANS Light Operation–32°C (–25°F) to –7°C (19°F) OFF Neutral, Reverse, Second–7°C (19°F) * OFF Full operation in all ranges* When sump temperature is below 10°C (50°F), and transmission fluid is C4(not DEXRON® or TranSynd™), follow this procedure when makingdirectional change shifts:(1) To shift from forward to reverse; selectN (Neutral)and thenR (Reverse)(2) To shift from reverse to forward; selectN (Neutral) and thenD (Drive), orother forward range. Failure to follow this procedure may cause illumination ofthe CHECK TRANS light and then transmission operation will be restricted toN (Neutral).

Transmission operation at cold ambient temperatures may require preheating orthe use of a lower viscosity transmission fluid. Refer to RECOMMENDEDAUTOMATIC TRANSMISSION FLUID AND VISCOSITY GRADE.

DRIVING ON SNOW OR ICE

WARNING: To avoid injury and/or property damage caused by loss ofvehicle control, DO NOT USE THE RETARDER DURINGINCLEMENT WEATHER OR WHEN ROAD SURFACES ARESLIPPERY. De-energize the retarder at the retarder enable switch.

NOTE: The retarder is automatically disabled whenever the vehicle’sABS (antilock brake system) is active. However, in case the ABSsystem malfunctions, it is recommended that the retarder enable switch,if present, be disabled.

Here is where all of your ability as a skilled driver comes into focus regardless ofwhat transmission you have. If possible, reduce your speed and select a lower

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range before you lose traction. Select the range that will not exceed the speed youexpect to maintain. Accelerate or decelerate very gradually to prevent losingtraction. It is very important to slow gradually when a lower range is selected. Itis important that you reach the lower range selected before attempting toaccelerate. This will avoid an unexpected downshift during acceleration.

ROCKING OUT

WARNING: To avoid injury or property damage caused by suddenmovement of the vehicle, do not make shifts fromN (Neutral) to aforward range orR (Reverse) when the throttle is open. The vehicle willlurch forward or rearward and the transmission can be damaged. Avoidthis condition by making shifts fromN (Neutral) to a forward range orR (Reverse) only when the throttle is closed and service brakes areapplied.

CAUTION: If the wheels are stuck and not turning, do not apply fullpower for more than 30 seconds in eitherD (Drive) or R (Reverse). Fullpower for more than 30 seconds under these conditions will cause thetransmission to overheat. If the transmission overheats, shift toN (Neutral) and operate the engine at 1200–1500 rpm until it cools(2–3 minutes).

Use the following procedure if the vehicle is stuck in deep sand, snow, or mud torock it out.

1. Shift toD (Drive) and apply steady, light throttle (never full throttle).When the vehicle has rocked forward as far as it will go, apply and holdthe vehicle service brakes.

2. Allow the engine to return to idle; then selectR (Reverse).

3. Release the brakes and apply a steady, light throttle and allow the vehicleto rock in R (Reverse) as far as it will go.

4. Apply and hold the service brakes and allow the engine to return to idle.

Repeat this procedure inD (Drive) andR (Reverse) if each directional shiftcontinues to move the vehicle a greater distance. Never makeN (Neutral) toD (Drive) or directional shift changes when the engine rpm is above idle.

HIGH FLUID TEMPERATUREThe transmission is considered to be overheated when any of the followingtemperatures are exceeded:

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Sump fluid 121°C (250°F)Fluid to cooler 149°C (300°F)

Retarder out fluid 165°C (330°F)

If the sump fluid temperature reaches 128°C (262°F) the ECU will inhibitoperation in the higher ranges

If the transmission overheats during normal operations, check the fluid level in thetransmission. Refer to the Fluid Check Procedures as described in the CARE ANDMAINTENANCE Section.

If the engine temperature gauge indicates a high temperature, the transmission isprobably overheated. Stop the vehicle and check the cooling system. If it appearsto be functioning properly, run the engine at 1200–1500 rpm with the transmissionin N (Neutral). This should reduce the transmission and engine temperatures tonormal operating levels in 2 or 3 minutes. If temperatures do not decrease, reducethe engine rpm.

CAUTION: The engine should never be operated for more than30 seconds at full throttle with the transmission in range and the outputstalled. Prolonged operation of this type will cause the transmission fluidtemperature to become excessively high and will cause severe overheatdamage to the transmission.

If the engine temperature indicates a high temperature, an engine or radiatorproblem is indicated. If high temperature in either the engine or transmissionpersists, stop the engine and have the overheating condition investigated bymaintenance personnel.

PARKING BRAKE

WARNING: If you leave the vehicle and the engine is running, thevehicle can move unexpectedly and you or others could be injured. Ifyou must leave the engine running, do not leave the vehicle until youhave completed all of the following procedures:

• Put the transmission inN (Neutral)• Ensure that the engine is at low idle (500–800 rpm)• Apply the parking brake and emergency brake and make sure they

are properly engaged• Chock the wheels and take any other steps necessary to keep the

vehicle from moving.

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SelectN (Neutral) and be sure that the parking brake is applied to secure thevehicle when it is not attended. Always make sure the vehicle’s parking brakesystem has been maintained per the manufacturer’s specifications.

TOWING OR PUSHING

CAUTION: Failure to lift the driving wheels off the road, disconnectthe driveline, or remove the axle shafts before pushing or towing cancause serious transmission damage.

The engine cannot be started by pushing or towing. Before pushing or towing avehicle, disconnect the driveline, lift the drive wheels off the road, or remove theaxle shafts from the drive wheels. When the axle shafts are removed, be sure tocover the wheel openings to prevent loss of lubricant and entry of dust and dirt.An auxiliary air supply will usually be required to actuate the vehicle brakesystem.

CRUISE CONTROL OPERATIONOperating an Allison WTEC III equipped vehicle on cruise control may cause thetransmission to shift cycle if the cruise control is set close to a scheduled shiftpoint. One of the following actions may eliminate shift cycling:

• Select a different shift schedule by pushing theMODE button on the shiftselector.

• Select a lower range by pushing the↓ (Down) arrow or moving the leveron the shift selector.

• Change the cruise control speed setting away from the shift point.

The engine brake on some vehicles equipped with an Allison WTEC IIItransmission may be controlled by the transmission ECU. With this configuration,the transmission will automatically select a lower range when the engine brake isapplied or the throttle is near idle position.

Operating a vehicle in cruise control with engine brake turned-on, controlled bythe transmission ECU, may cause unwanted application of the engine brake whenthe cruise control decelerates for downhill grades. Operator may choose to turn offcruise control to eliminate the unwanted condition.

TURNING OFF THE VEHICLEAlways selectN (Neutral) prior to turning off the vehicle engine.

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ENGINE-DRIVEN POWER TAKEOFF (PTO)

CAUTION: Do not exceed the engagement and operational speed limitsimposed on the driven equipment during the operation of the PTO.Exceeding the speed limits produces high hydraulic pressure in the PTOthat can damage the PTO components. Consult the vehiclemanufacturer’s literature for these speed limits.

If a PTO is present, it will be mounted on either left side, right side, or top for a3000MH Series transmission depending upon the converter housing configuration.The PTO is located on the left side or top for a 4000MH Series transmission. ThePTO drive gear is engine-driven and therefore provides direct engine power. ThePTO can be operated when the vehicle is either moving or stopped.

The PTO gear is in constant mesh with the drive gear in the converter housing.PTOs are either constant drive (output always powered) or clutched drive. Theoutput of a clutched drive PTO is powered when the PTO clutch is pressurized.

Be sure that the limits for PTO engagement speed and operational speed are notexceeded. Consult the vehicle manufacturer’s literature for these speed limits.Also, all MH Series equipped vehicles with PTO enable have engagement andoperational speed limits programmed into the ECU to help protect PTOequipment. Some speed limits have default values which are programmed out ofthe operating range and will need to be set for your particular PTO duty cycle.Consult your vehicle manufacturer to see if your transmission has beenprogrammed and what operational limits have been established.

When the programmed engagement speed is exceeded, the PTO will not engage.The PTO engagement must be retried after the speed has been reduced. Whenoperational speeds (either engine or transmission output) are exceeded, the PTOwill deactivate and the PTO engagement process must be repeated.

M H S E R I E S

POWER TAKEOFFOPERATION

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PERIODIC INSPECTIONSThe Allison 3000MH and 4000MH Series transmissions require minimummaintenance. Careful attention to the fluid level and the connections for theelectronic and hydraulic circuits is most important.

Do the following periodic inspection:

• Keep the transmission clean for easier inspection.

• Make periodic checks for loose bolts and fluid leaks around fittings, lines,and transmission openings.

• Check the condition of the electrical wiring harnesses regularly.

• Check the engine cooling system occasionally for evidence of transmissionfluid that would indicate a faulty oil cooler.

• Report any abnormal condition to your maintenance personnel.

PREVENT MAJOR PROBLEMSHelp the WTEC III control system oversee the operation of the transmission.Minor problems can be kept from becoming major problems if you notify anAllison Transmission distributor or dealer when one of these conditions occur:

• Shifting feels odd

• Transmission leaks fluid

• Unusual transmission-related sounds

NOTE: Changes in sound caused by normal engine thermostatic fancycling, while climbing a long grade with a heavy load, may bemistaken for transmission-related sounds.

• CHECK TRANS light comes on frequently

CARE AND MAINTENANCEM H S E R I E S

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IMPORTANCE OF PROPER FLUID LEVELBecause the transmission fluid cools, lubricates, and transmits hydraulic power, itis important that the proper fluid level be maintained at all times. If the fluid levelis too low, the converter and clutches do not receive an adequate supply of fluid.If fluid level is too high, the fluid can aerate. Aerated fluid can cause thetransmission to shift erratically or overheat.

The MH Series has an electronic oil level (OLS) sensor that allows the operator toobtain an indication of fluid level from the shift selector. However, no oil levelsensor diagnostics take place unless the OLS is “autodetected” by the WTEC IIIcontrol system. Frequently check for the presence of oil level diagnostics if thetransmission is known to contain an OLS. If an OLS is not detected during thefirst 49 engine starts, the WTEC III system concludes that no OLS is present. Ifan OLS is known to be present, but has not been detected, then troubleshooting ofthe OLS circuit is required.

NOTE: To correctly check the transmission fluid level using thedipstick, the transmission fluid must be at operating temperature. The oillevel sensor method of checking the fluid level compensates fortransmission fluid temperature between 60–104°C (140–220°F). Anytemperature below 60°C (140°F) or above 104°C (220°F) will result inan Invalid for Display condition.

FLUID LEVEL CHECK USING THE PUSHBUTTON ORLEVER SHIFT SELECTORThe transmission is equipped with the electronic oil level sensor in order to readfluid level information.

• Park the vehicle on a level surface, shift toN (Neutral), and apply theparking brake.

NOTE: The pushbutton and lever selectors display one character at onetime.

• Pushbutton shift selector—If equipped with an oil level sensor,simultaneously press the↑ (Up) and↓ (Down) arrow buttons.

• Lever shift selector—If equipped with an oil level sensor, press the displaymode button one time.

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NOTE: The fluid level check may be delayed until the followingconditions are met:— The fluid temperature is above 60°C (140°F) and below

104°C (220°F).— The transmission is inN (Neutral).— The vehicle has been stationary for approximately two minutes to

allow the fluid to settle.— The engine is at idle.— The transmission output shaft is stopped.

The indication of a delayed fluid level check is a “—” in the display windowfollowed by a numerical countdown display. The countdown, starting at 8,indicates the time remaining in the two minute settling period.

• Correct Fluid Level—“o,L” is displayed (“o,L” represents “Fluid (Oil)Level Check Mode”), followed by “o,K.” The “o,K” display indicates thefluid is within the correct fluid level zone. The sensor display and thetransmission dipstick may not agree exactly because the oil level sensorcompensates for fluid temperature.

NOTE: Fluid level diagnostic displays occur one character at a time.

• Low Fluid Level—“o,L” is displayed (“o,L” represents “Fluid (Oil) LevelCheck Mode”), followed by “Lo” (“Lo” represents “Low Oil Level”) andthe number of quarts the transmission fluid is low. Example: “2” indicates 2additional quarts of fluid will bring the fluid level within the middle of the“oK” zone.

• High Fluid Level—“o,L” is displayed (“o,L” represents “Fluid (Oil) LevelCheck Mode”), followed by “HI” (“HI” represents “High Oil Level”) andthe number of quarts the transmission is overfilled. Example: “1” indicates1 quart of fluid above the full transmission level.

• Invalid for Display —“o,L” is displayed (“o,L” represents “Fluid (Oil)Level Check Mode”), followed by “—” and a numerical display. Thenumerical display is a fault code and indicates conditions are not proper toreceive the fluid level information, or that there is a system malfunction.The fault codes that may be encountered are shown in theOil Level FaultCodestable.

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Oil Level Fault Codes

Display Cause of Codeo,L, —, 0, X Settling time too shorto,L, —, 5, 0 Engine speed (rpm) too lowo,L, —, 5, 9 Engine speed (rpm) too higho,L, —, 6, 5 Neutral must be selectedo,L, —, 7, 0 Sump fluid temperature too lowo,L, —, 7,9 Sump fluid temperature too higho,L, —, 8, 9 Output shaft rotationo,L, —, 9, 5 Sensor failure *

* Report sensor failure display to a distributor or dealer in your area (check thetelephone directory for the nearest Allison Transmission distributor or dealer).

CAUTION: A low or high fluid level can cause overheating andirregular shift patterns. Incorrect fluid level can damage thetransmission.

NOTE: To exit the fluid level display mode, press any range button onthe pushbutton shift selector, or press the display mode (diagnostic)button twice on the lever shift selector.

MANUAL FLUID CHECK PROCEDURE

WARNING: If you leave the vehicle and the engine is running, thevehicle can move unexpectedly and you or others could be injured. Ifyou must leave the engine running, do not leave the vehicle until youhave completed all of the following procedures:

• Put the transmission inN (Neutral)• Ensure that the engine is at low idle (500–800 rpm)• Apply the parking brake and emergency brake and make sure they

are properly engaged• Chock the wheels and take any other steps necessary to keep the

vehicle from moving.

Clean around the end of the fill tube before removing the dipstick. This will aid inpreventing dirt or foreign matter from entering the hydraulic system, which cancause valves to stick, undue wear of transmission parts, or clogged passages.Check the fluid level by the following procedure and report any abnormal level toyour maintenance personnel.

38

COLD CHECKThe Cold Check determines if the transmission has enough fluid to be operatedsafely until a Hot Check can be made.

CAUTION: DO NOT start the engine until the presence of sufficienttransmission fluid has been confirmed. Remove the transmission fluiddipstick and be sure the static fluid level is near the HOT FULL mark.

A cold check may be made after initial start-up and the presence of transmissionfluid has been confirmed (the sump fluid temperature is then typically16–49°C (60–120°F).

• If the engine has been shut down for an extended time, park the vehicle ona level surface and apply the parking brake.

• Start and run the engine at idle (500–800 rpm) inN (Neutral) for aboutone minute. Shift toD (Drive) and then toR (Reverse) to clear thehydraulic circuits of air. Shift toN (Neutral) and leave engine at idle.

• After wiping the dipstick clean, check the fluid level. If the fluid on thedipstick is within the COLD RUN band, the level is satisfactory. If the fluidlevel is not within this band, add or drain fluid as necessary to bring thelevel within the COLD RUN band.

• Perform a Hot Check at the first opportunity after normal operatingtemperature (71–93°C; 160–200°F) is reached.

HOT CHECK

CAUTION: When performing the Hot Check procedure, the fluid mustbe hot to ensure an accurate check and help prevent transmissiondamage. The fluid level rises as temperature increases. During operation,an overfull transmission can become overheated, leading to transmissiondamage.

CAUTION: Obtain an accurate fluid level check by ensuring thefollowing conditions are imposed:

• Engine is idling (500–800 rpm) inN (Neutral)• Transmission fluid is at the proper temperature• The vehicle is on a level surface

Because the fluid level rises as temperature increases, the fluid must be hot toensure an accurate check.

39

• Be sure fluid has reached normal operating temperature(71–93°C; 160–200°F). If a transmission temperature gauge is not present,check fluid level when the engine water temperature gauge has stabilizedand the transmission has been operated under load for at least one hour.

• Park the vehicle on a level surface and shift toN (Neutral). Apply theparking brake and allow the engine to idle (500–800 rpm).

• After wiping the dipstick clean, check the fluid level. The safe operatinglevel is anywhere within the HOT RUN band on the dipstick.

• If the level is not within this band, add or drain fluid as necessary to bringthe level within the HOT RUN band.

• Be sure that fluid level checks are consistent. Check level more than onceand if readings are not consistent, check to be sure that the transmissionbreather is clean and not clogged. If readings are still not consistent, contactyour nearest Allison distributor or dealer.

RECOMMENDED AUTOMATIC TRANSMISSION FLUID ANDVISCOSITY GRADETranSynd™ is a full synthetic transmission fluid developed by AllisonTransmission and Castrol Ltd. This fluid meets Allison specifications for SevereDuty and Extended Drain Intervals. TranSynd™ is fully qualified to the GMDEXRON®-III and Allison C-4 specifications and is available through Allisondistributors and dealerships.

Hydraulic fluids (oils) used in the transmission are important influences ontransmission performance, reliability, and durability. TranSynd™ andDEXRON®-III fluids are recommended for on-highway applications. Allison TypeC-4 fluids may also be used.

Some DEXRON®-III fluids are also qualified as Type C-4 fluids. To ensure thefluid is qualified for use in Allison transmissions check for the DEXRON®-IIIlicense numbers and/or C-4 approval numbers on the container or consult thelubricant manufacturer. Consult your Allison Transmission dealer or distributorbefore using other fluid types.

CAUTION: Disregarding minimum fluid temperature limits can resultin transmission malfunction or reduced transmission life.

When choosing the optimum viscosity grade of fluid, duty cycle, preheatcapabilities, and/or geographical location must be taken into consideration.Minimum Operating Temperature For Transmission Fluid table lists theminimum fluid temperatures at which the transmission may be safely operated

40

without preheating. Preheat with auxiliary heating equipment or by running theequipment or vehicle with the transmission in neutral for a minimum of20 minutes before attempting range operation.

Minimum Operating Temperature For Transmission Fluid

Viscosity Grade

Ambient Temperature Below Which Preheat IsRequired

Celsius FahrenheitSAE 0W-20* orTranSynd™

–30 –22

DEXRON®-III –27 –17SAE 10W –20 –4SAE 15W-40 –15 5SAE 30 0 32SAE 40 10 50

(Ref. 13-TR-90)* “Arctic” as defined by MIL-L-46167B

KEEPING FLUID CLEAN

CAUTION: Containers or fillers that have been used for antifreezesolution or engine coolant must NEVER be used for transmission fluid.Antifreeze and coolant solutions contain ethylene glycol which, if putinto the transmission, can cause the clutch plates and some seals to fail.

It is absolutely necessary that transmission fluid be clean. The fluid must behandled in clean containers to prevent foreign material from entering thetransmission.

FLUID AND INTERNAL FILTER CHANGE INTERVALRECOMMENDATIONS

CAUTION: Transmission fluid and filter change frequency isdetermined by the severity of transmission service. To help avoidtransmission damage, more frequent changes can be necessary thanrecommended in the general guidelines when operating conditions createhigh levels of contamination or overheating.

The 3000MH and 4000MH Transmission Fluid and Filter Change tables are givenonly as a general guide for fluid and filter change interval.

41

Refer to3000MH Transmission Fluid and Filter Change table for fluid andfilter change intervals for the 3000MH. Refer to4000MH Transmission Fluidand Filter Changefor the same information for the 4000MH.

NOTE: Both the 3000MH and 4000MH require an initial main filterelementonly change at 8000 km (5000 miles). A fluid change is notrequired at that time.

42

3000MH Transmission Fluid and Filter Change

SEVERE VOCATION GENERAL VOCATION

Fluid

Filters

Fluid

Filters

Main Internal Lube/Auxiliary Main InternalLube/

AuxiliarySchedule 1. Non-TranSynd™/Non-TES 295 Fluid

20 000 km(12,000 Miles)

6 Months500 Hours

20 000 km(12,000 Miles)

6 Months500 Hours

Overhaul 20 000 km(12,000 Miles)

6 Months500 Hours

40 000 km(25,000 Miles)

12 Months1000 Hours

40 000 km(25,000 Miles)

12 Months1000 Hours

Overhaul 40 000 km(25,000 Miles)

12 Months1000 Hours

The recommendations in Schedule 2 are based upon the transmission containing 100 percent of TranSynd™ fluid.3000MH Filter change intervals in Schedule 2 are only valid with the use of Allison Transmission Gold series filters.Flushing Machines are not recommended or recognized due to variation and inconsistencies with ensuring removal of 100percent of the used fluid.

Schedule 2. TranSynd™/TES 295 Fluid)120 000 km

(75,000 Miles)36 Months3000 Hours

120 000 km(75,000 Miles)

36 Months3000 Hours

Overhaul 120 000 km(75,000 Miles)

36 Months3000 Hours

240 000 km(150,000 Miles)

48 Months4000 Hours

120 000 km(75,000 Miles)

36 Months3000 Hours

Overhaul 120 000 km(75,000 Miles)

36 Months3000 Hours

NOTE: Change fluid/filters after recommended mileage, months, or hours have elapsed, whichever occurs first.Severe Vocation:Motor homes with retarders, on/off-highway.General Vocation: Motor homes without retarders.Local conditions, severity of operation or duty cycle may require more or less frequent fluid change intervals thatdiffer from the published recommended fluid change intervals of Allison Transmission.Transmission protection and fluidchange intervals can be optimized by the use of fluid analysis.Filters must be changed at or before recommendedintervals.

43

4000MH Transmission Fluid and Filter Change

SEVERE VOCATION GENERAL VOCATION

Fluid

Filters

Fluid

Filters

Main InternalLube/

Auxiliary Main InternalLube/

AuxiliarySchedule 1. Non-TranSynd™/Non-TES 295 Fluid

20 000 km(12,000 Miles)

6 Months500 Hours

20 000 km(12,000 Miles)6 Months 500

Hours

Overhaul 20 000 km(12,000 Miles)6 Months 500

Hours

40 000 km(25,000 Miles)

12 Months 1000Hours

40 000 km(25,000 Miles)

12 Months1000 Hours

Overhaul 40 000 km(25,000 Miles)

12 Months1000 Hours

NOTE: The following recommendations in Schedule 2 are based upon the transmission containing 100 percent ofTranSynd™ fluid.4000MH Filter change intervals in Schedule 2 and 3 are only valid with the use of Allison Transmission Gold series filters.Flushing Machines are not recommended or recognized due to variation and inconsistencies with ensuring removal of 100percent of the used fluid.

4 inch Control Module (3.5 inch approximately)—Requires filter kit P/N 29540494Schedule 2. TranSynd™/TES 295 Fluid

120 000 km(75,000 Miles)

36 Months3000 Hours

120 000 km(75,000 Miles)

36 Months3000 Hours

Overhaul 120 000 km(75,000 Miles)

36 Months3000 Hours

240 000 km(150,000 Miles)48 Months 4000

Hours

120 000 km(75,000 Miles)

36 Months3000 Hours

Overhaul 120 000 km(75,000 Miles)

36 Months3000 Hours

44

4000MH Transmission Fluid and Filter Change (cont’d)

SEVERE VOCATION GENERAL VOCATION

Fluid

Filters

Fluid

Filters

Main InternalLube/

Auxiliary Main InternalLube/

Auxiliary2 inch Control Module (1.75 inch approximately)—Requires filter kit P/N 29540493

Schedule 3. TranSynd™/TES 295 Fluid80 000 km

(50,000 Miles)24 Months2000 Hours

80 000 km(50,000 Miles)

24 Months2000 Hours

Overhaul 80 000 km(50,000 Miles)

24 Months2000 Hours

240 000 km(150,000 Miles)48 Months 4000

Hours

80 000 km(50,000 Miles)

24 Months2000 Hours

Overhaul 80 000 km(50,000 Miles)

24 Months2000 Hours

NOTE: Change fluid/filters after recommended mileage, months, or hours have elapsed, whichever occurs first.Severe Vocation:Motor homes with retarders, on/off-highway.General Vocation: Motor homes without retarders.Local conditions, severity of operation or duty cycle may require more or less frequent fluid change intervals thatdiffer from the published recommended fluid change intervals of Allison Transmission.Transmission protection and fluidchange intervals can be optimized by the use of fluid analysis.Filters must be changed at or before recommendedintervals.

45

Fluid Analysis.

CAUTION: Transmission fluid and filter change frequency isdetermined by the severity of transmission service. To help avoidtransmission damage, more frequent changes can be necessary thanrecommended in the general guidelines when operating conditions createhigh levels of contamination or overheating.

Transmission protection and fluid change intervals can be optimized by monitoringfluid oxidation according to the tests and limits shown in theFluid OxidationMeasurement Limits table. Consult your local telephone directory for fluidanalysis firms. To ensure consistent and accurate fluid analysis, use only one fluidanalysis firm. Refer to Technician’s Guide for Automatic Transmission Fluid,GN2055EN, for additional information.

Fluid Oxidation Measurement Limits

Test LimitViscosity ±25% change from new fluidTotal Acid Number +3.0* change from new fluid maximumSolids 2% by volume* mg of KOH to neutralize a g offluid.

TRANSMISSION FLUID CONTAMINATION

Fluid Examination. At each fluid change, examine the drained fluid for evidenceof dirt or water. A normal amount of condensation will appear in the fluid duringoperation.

Water. Obvious water contamination of the transmission fluid or transmissionfluid in the cooler (heat exchanger) water indicates a leak between the water andfluid areas of the cooler. Inspect and pressure test the cooler to confirm the leak.Replace leaking coolers.

NOTE: Cooler water can also be contaminated by engine oil; be sure tolocate the correct source of cooler water contamination.

Engine Coolant.Engine coolant in the transmission hydraulic system requiresimmediate action to prevent malfunction and possible serious damage. Anauthorized Allison service outlet must completely disassemble, inspect, and cleanthe transmission. All traces of the coolant, and varnish deposits resulting from

46

engine coolant contamination must be removed. Friction clutch platescontaminated with engine coolant (ethylene glycol) must be replaced.

Metal. Metal particles in the fluid (except for the minute particles normallytrapped in the oil filter) indicate internal transmission damage. If these particlesare found in the sump, the transmission must be disassembled and closelyinspected to find their source. Metal contamination requires complete transmissiondisassembly. Clean all internal and external hydraulic circuits, cooler, and all otherareas where the particles could lodge.

CAUTION: After flushing the cooler, be sure to check cooler circuitrestriction. If circuit pressure drop is above specification, the cooler hasexcessive trapped particles and must be replaced. Excessive pressuredrop impedes transmission cooling which can cause overheating andtransmission damage.

TRANSMISSION FLUID AND FILTER CHANGEPROCEDURE

Drain Fluid.

NOTE: Do not drain the transmission fluid if only filters are beingreplaced.

1. Drain the fluid when the transmission is at operating temperature of71–93°C (160–200°F). Hot fluid flows quicker and drains more completely.

2. Remove the drain plug from the control module and allow the fluid todrain into a suitable container.

3. Examine the fluid as described in the TRANSMISSION FLUIDCONTAMINATION paragraph.

Replace Filters. Refer to Figure 6.

1. Remove 12 bolts 1, two filter covers 2, two gaskets 3, two O-rings 4, twoO-rings 5 and two filters 6 from the bottom of the control module.

2. When reinstalling parts, lubricate and install new O-rings 4 and 5 on eachcover 2. Lubricate O-ring inside filter 6 and push filter onto each cover 2.Install new gasket 3 on each cover 2 and align holes in gasket with holesin cover.

47

CAUTION: Do not use the bolts to draw the filter covers to the controlmodule. Do not use an impact wrench to tighten the bolts. Using animpact wrench to tighten the bolts can strip threads and cause expensiveparts replacement. Use a torque wrench to tighten the bolts.

3. Install filter and cover assemblies into the filter compartment. Align eachfilter/cover assembly with the holes in the channel plate/sump. Push thecover assemblies in by hand to seat the seals.

4. Install six bolts into each cover and tighten to 51–61 N•m (38–45 lb ft).

5. Replace the drain plug O-ring. Install the plug and tighten to 25–32 N•m(18–24 lb ft).

DRAINPLUG

FILTERCOVER

V03532.02

DRAINPLUG

6

HD/B 500/4000MH MD/B 300/B 400/3000MH

5

4

21

3

MAIN

MAINMAIN

LUBE

LUBE LUBE

Figure 6. Location of Filters for Service

48

Refill Transmission. The amount of refill fluid is less than the amount used forthe initial fill. Fluid remains in the external circuits and transmission cavities afterdraining the transmission. After refill, check the fluid level. Refer to FLUIDLEVEL CHECK USING THE PUSHBUTTON OR LEVER SHIFT SELECTORparagraph.

Transmission Fluid Capacity

Initial Fill * Refill*Transmission Sump Liters Quarts Liters Quarts

3000MH 4 inch 27 29 18 193000MH 2 inch 25 26 11 124000MH 4 inch 45 48 37 394000MH 2 inch 38 40 30 31

* Approximate quantity, does not include external lines and cooler hose.

49

DIAGNOSTIC CODESContinued illumination of the CHECK TRANS light during vehicle operation (notstart-up) indicates the ECU has signaled a diagnostic code. Poor performance mayactivate a code without illuminating the CHECK TRANS light. Up to fivediagnostic codes can be recorded. Diagnostic codes can be read and cleared bytwo methods: by using the shift selectors shown below or using the AllisonDOC™ Diagnostic Tool for the PC or PDA. Use of the Allison DOC™Diagnostic Tool for the PC or PDA is described in the instruction manualfurnished with each tool. Basic information on code reading, code clearing andtroubleshooting is covered in this DIAGNOSIS section. More detailed informationis available in the Troubleshooting Manual shown in the SERVICE LITERATUREparagraph.

Diagnostic codes are numerical indications relating to a malfunction intransmission operation. Each code consists of a two-digit main code and atwo-digit subcode. These codes are logged in a list in the ECU memory with the

1

2

3

4

5

D

N

RMODE

R

N

D

MODE

SHIFTSELECTORS ALLISON DOC™

PDA

PC

V07952.00.00

Figure 7. Shift Selector/Allison DOC™ Diagnostic Tool

M H S E R I E S

DIAGNOSIS

50

most severe or otherwise most recent code listed first. A maximum of five codes(numbered d1–d5) may be listed in memory at one time. As codes are added, theoldest nonactive code is dropped from the list. If all codes are active, the codewith the lowest priority that is not included on the severity list is dropped fromthe list. Access to the diagnostic codes and code information is through thepushbutton and lever shift selectors or the diagnostic data reader.

The ECU separately stores the active and historical (nonactive) codes. An activecode is any code that is current in the ECU decision-making process. Historicalcodes are codes that are retained in the ECU’s memory and will not necessarilyaffect the ECU decision-making process. Historical codes are useful indetermining if a problem is isolated, is intermittent, or results from a previousmalfunction.

DIAGNOSTIC CODE DISPLAY PROCEDUREDiagnostic codes can be read and cleared by two methods:

• With the pushbutton or lever shift selector

• With the Allison DOC™ diagnostic tool for the PC or PDA. The use of theAllison DOC™ diagnostic tool is described in the instruction manualfurnished with each tool.

Diagnostic codes are displayed as follows:

The code list position is the first item displayed, followed by the main code andthe subcode. Each item is displayed for about one second. The display cyclescontinuously until the next code list position is accessed by pressing the MODEbutton. The following list represents the display cycle using code 25 11 as anexample:

1. Code list position—d, 1

2. Main code—2, 5

3. Subcode—1, 1

4. Cycle repeats—d, 1

To view the second, third, fourth, and fifth positions (d2, d3, d4, d5), momentarilypress the MODE button. Momentarily press the MODE button after the fifthposition is displayed to restart the sequence of code list positions.

If a listed code is active, the LED indicator next to the MODE button isilluminated. Any code position which does not have a diagnostic code logged willdisplay “ - ” for both the main and subcodes.

51

Pushbutton Shift Selector.

• Bring the vehicle to a stop at a safe location.

• Apply the parking brake.

To Display Stored Codes:

1. Simultaneously press the↑ (Up) and↓ (Down) arrow buttons once toaccess the diagnostic display mode—press the buttons twice if atransmission oil level sensor is installed.

2. Observe the digital display for codes (codes will appear one digit at atime).

3. Press the MODE button to see the next code—repeat for subsequent codes.

NOTE: Be sure to record all codes displayed before they are cleared.This is essential for troubleshooting.

To Clear Active Indicators and Resume Vehicle Operation:

1. Press and hold the MODE button for approximately three seconds until themode indicator (LED) flashes.

2. Release the MODE button and active indicators such as the CHECKTRANS light will not be illuminated. Some codes are self-clearing andothers require ignition cycles to clear.

NOTE: If the condition that caused the code is still present, the codewill again become active.

To Exit The Diagnostic Mode:

1. Press the↑ (Up) and↓ (Down) arrow buttons at the same time.

2. PressN (Neutral).

Lever Shift Selector.

• Bring the vehicle to a stop at a safe location.

• Apply the parking brake.

To Display Stored Codes:

1. Press the DISPLAY MODE button once to access the diagnostic displaymode—press the button twice if a transmission oil level sensor is installed.

52

2. Observe the digital display for codes (codes will appear one digit at atime).

3. Press the MODE button to see the next code—repeat for subsequent codes.

NOTE: Be sure to record all codes displayed before they are cleared.This is essential for troubleshooting.

To Clear Active Indicators and Resume Vehicle Operation:

1. Press and hold the MODE button for approximately three seconds until themode indicator (LED) flashes.

2. Begin operating as normal—have the transmission checked at the earliestopportunity by an Allison Transmission distributor or dealer.

NOTE: If the condition that caused the code is still present, the codewill again become active.

To Exit The Diagnostic Mode:

1. Press the DISPLAY MODE (Diagnostics) button.

2. Move the selector lever to any position other than the one where thediagnostic mode was entered.

DIAGNOSTIC CODE LISTINGS AND PROCEDURESThe following table presents information about the diagnostic codes which mayoccur during the operation of the transmission. For additional information, refer toTS2973EN Troubleshooting Manual for WTEC III Controls.

53

Code Listings And Procedures

CODES QUICK CHECKSMAINCODE

SUBCODE

13 12 Check:

a. Battery direct ground and power connections aretight and clean.

b. Vehicle batteries are charged.

c. Vehicle charging system is not over- orunder-charging.

d. VIM fuse is good.

e. VIM connections are tight, clean, and undamaged.

f. Vehicle manufacturer supplied wiring is correct.

g. ECU connectors are tight, clean, and undamaged.

ECU Input VoltageLow

13 13

ECU Input VoltageMedium Low

13 23

ECU Input VoltageHigh

14 12, 23 Check:

a. Is transmission equipped with oil level sensor?

b. Engine speed sensor, output speed sensor,temperature sensor, and oil level sensor areworking correctly.

c. Wiring harness has no opens, shorts to ground, orshorts to battery.

Oil Level Sensor

21 12, 23 Check:

a. TPS connector is properly connected.

b. End of TPS cable is pulled out properly.

c. Engine fuel lever is in idle position.

d. Engine fuel lever provides proper amount ofstroke on TPS cable.

e. Wiring harness to TPS has no opens, shortsbetween wires, or shorts to ground.

f. TPS for proper operation and resistance readings.

Throttle PositionSensor

54

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

22 14, 15, 16 Check:

a. Speed sensors and connectors are tight, clean, andundamaged.

b. Wiring harness to sensors has no opens, shortsbetween wires, or shorts to ground.

Speed Sensors

23 12, 13, 14,15, 16

Check:

a. ECU connectors are tight, clean, and undamaged.

b. Shift selector connector is tight, clean, andundamaged.

c. Wiring harness has no opens, shorts betweenwires, or shorts to ground.

d. Shift selector(s) for proper operation.

Shift Selectors

24 12 Check:

a. Air temperature is below –32°C (–25°F)

• If yes, this is a correct response fortemperature.

• If no, check that main transmission connector istight, clean, and undamaged.

b. ECU connectors are tight, clean, and undamaged.

Sump FluidTemperature Cold

24 23 Verify the overheat situation. Check:

a. Correct dipstick is installed.

b. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

• If fluid level is incorrect—correct fluid level.

• If fluid level is correct—check for cause ofoverheating.

c. Check if ECU and transmission connectors aretight, clean, and undamaged.

Sump FluidTemperature Hot

55

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

25 00, 11, 22,33, 44, 55,

66, 77

Check:

a. Speed sensor connector is tight, clean, andundamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

d. Wiring harness to sensor has no opens, shortsbetween wires, or shorts to ground.

Output SpeedSensor

26 00, 11 Check:

a. TPS for proper operation, related harness foropens and shorts.

b. Serial connection to engine is tight, clean, andundamaged.

c. SCI wiring harness has no opens or shorts.

Throttle/EngineCoolant Source NotDetected

32 00, 33, 55,77

Check:

a. Correct dipstick is installed.

b. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

c. Main transmission connector is tight, clean, andundamaged.

d. ECU connectors are tight, clean, and undamaged.

e. Wiring harness has no opens, shorts betweenwires, or shorts to ground.

C3 Pressure SwitchOpen

33 12, 23 Check:

a. Main transmission connector is tight, clean, andundamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Wiring harness has no opens, shorts betweenwires, or shorts to ground.

Sump OilTemperature SensorFailure

56

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

34 12, 13, 14,15, 16, 17

a. Recalibrate ECU, if possible.

b. Replace ECU if not possible to recalibrate.EEPROM35 00, 16 Check:

a. ECU connectors are tight, clean, and undamaged.

b. VIM connectors are tight, clean, and undamaged.

c. Vehicle manufacturer supplied wiring has correctpower and ground connections.

d. Power connections are battery direct.

e. Ground connections are battery direct.

f. Ignition switch connections are correct.

Power InterruptionReal Time WriteInterruption

36 00, 01, 02a. If able, recalibrate ECU; if not, replace ECU.

b. Check that ECU is compatible with TransID level(36 01).

c. Troubleshoot TransID wire and circuit for short tobattery (36 02).

Hardware/SoftwareNot Compatible

42 12, 13, 14,15, 16, 2122, 23, 24,

26

Check:

a. Main transmission connector is tight, clean, andundamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Wiring harness is not pulled too tight, and there isno damage, chafing, or screws through harness.

d. Wiring harness has no opens, shorts betweenwires, or shorts to ground.

e. Unauthorized repairs have not been made.

f. Change harness (optional).

Short to Battery inSolenoid Circuit

57

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

44 12, 13, 14,15, 16, 21,22, 23, 24,

26

Check:

a. Main transmission connector is tight, clean, andundamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Wiring harness has no opens, shorts betweenwires, or shorts to ground.

Solenoid CircuitShort to Ground

45 12, 13, 14,15, 16, 21,22, 23, 24,

26

Check: a. b. c.

a. Main transmission connector is tight, clean, andundamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Wiring harness has no opens or shorts.

Solenoid CircuitOpen

46 21, 26, 27 Check:

a. Main transmission connector is tight, clean, andundamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Wiring harness has no opens, shorts betweenwires, or shorts to ground.

d. Replace ECU.

SolenoidOvercurrent

51 01, 10, 12,21, 23, 24,35, 42, 43,45, 46, 53,

64, 65,XY*

Check:

a. Output and turbine speed sensor connectors aretight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

c. Correct dipstick is installed.

d. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

Offgoing Ratio Test(During Shift)

58

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

52 01, 08, 32,34, 54, 56,71, 72, 78,

79, 99,XY*

Check:

a. Output and turbine speed sensor connectors aretight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

c. Main wiring harness to transmission has no shortsbetween wires or shorts to ground.

d. Correct dipstick is installed.

e. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

Offgoing C3Pressure Switch Test(During Shift)

53 08, 09, 18,19, 28, 29,38, 39, 48,49, 58, 59,68, 69, 78,99, XY*

Check:

a. Turbine and engine speed sensor connectors aretight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

c. Correct dipstick is installed.

d. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

Offgoing Speed Test(During Shift)

54 01, 07, 10,12, 17, 21,23, 24, 27,32, 34, 35,42, 43, 45,46, 53, 54,56, 64, 65,70, 71, 72,80, 81, 82,83, 85, 86,87, 92, 93,

95, 96,XY*

Check:

a. Turbine and output speed sensor connectors aretight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

c. Correct dipstick is installed.

d. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

e. EEPROM calibration is correct for thetransmission.

Oncoming RatioTest (After Shift)

59

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

55 07, 17, 27,87, 97,XY*

Check:

a. Correct dipstick is installed.

b. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

c. Output and turbine speed sensor connectors aretight, clean, and undamaged.

d. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

e. Transmission connector is tight, clean, andundamaged.

f. ECU connectors are tight, clean, and undamaged.

g. C3 pressure switch wiring has no opens, shortsbetween wires, or shorts to ground.

Oncoming C3Pressure Switch Test(After Shift)

56 00, 11, 22,33, 44, 55,

66, 77

Check:

a. Turbine and output speed sensor connectors aretight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

c. Transmission connector is tight, clean, andundamaged.

d. ECU connectors are tight, clean, and undamaged.

e. Correct dipstick is installed.

f. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

Range VerificationRatio Test

60

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

57 11, 22, 44,66, 88, 99

Check:

a. Correct dipstick is installed.

b. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

c. Output and turbine speed sensor connectors aretight, clean, and undamaged.

d. Speed sensor wiring harness has no opens, shortsbetween wires, or shorts to ground.

e. Transmission connector is tight, clean, andundamaged.

f. ECU connectors are tight, clean, and undamaged.

g. C3 pressure switch wiring has no opens, shortsbetween wires, or shorts to ground.

Range VerificationC3 Pressure SwitchTest

61 00 Check:

a. Fluid level is correct. Refer to CARE ANDMAINTENANCE section.

b. Retarder apply system is not allowing retarder andthrottle to be applied at the same time.

c. Fluid cooler is adequately sized for load.

Retarder OverTemperature

61

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

62 12, 23, 32,33

Check:

a. Retarder temperature measured with diagnostictool is consistent with code: or determine if codeis active using shift selector.

b. Sensor connector is tight, clean and undamaged.

c. ECU connectors are tight, clean, and undamaged.

d. Temperature sensor circuit has no opens, shortsbetween wires, or shorts to ground.

e. Serial connection to engine computer is tight,clean, and undamaged.

f. SCI wiring harness has no opens or shorts.

RetarderTemperature Sensor,Engine CoolantSensor

63 00, 26, 40,41, 47

Check input wiring, switches, and connectors todetermine why input states are different.

Input Function Fault64 12, 23 Use diagnostic tool to read retarder counts and identify

problem wires. Check wiring for short to battery, groundwire open, or short to ground.

Retarder ModulationRequest DeviceFault

66 00, 11, 22 Check: a. b. c.

a. Serial connection to engine computer is tight,clean, and undamaged.

b. SCI wiring harness has no opens, shorts, or shortsto ground.

c. If diagnostic tool is not available, also be sure thattransmission ECU connections are tight, clean, andundamaged.

d. Problem with CAN link or engine controls.

SerialCommunicationsInterface Fault

69 27, 28, 29,33, 34, 35,36, 39, 41,

42, 43

a. Clear diagnostic code and retry vehicle start.

b. If code recurs, reprogram or replace ECU.

ECU Malfunction

62

Code Listings And Procedures (cont’d)

CODES QUICK CHECKSMAINCODE

SUBCODE

70 12, 13, 14 Reset ECUSoftware Problem* Additional codes could be logged for other shifts where X indicates rangeshifted from and Y indicates range shifted to.

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ABBREVIATIONS AND DEFINITIONS

ABS Anti-lock BrakeSystem—OEM-provided means to detect andprevent wheel stoppage to enhance vehicle handling. Retarder andengine brakes will not apply when ABS is active.

C3PS C3 PressureS witch—Pressure switch to signal the presence orabsence of pressure in the C3 clutch-apply circuit.

CT ClosedThrottle

DNA DoesNot Adapt—Adaptive shift control is disabled.

DNS DO NOT SHIFT—Refers to the DO NOT SHIFT diagnosticresponse during which the CHECK TRANS light is illuminatedand the transmission will not shift and will not respond to theShift Selector.

ECU ElectronicControl Unit (also commonly referred to as the“computer”)

EEPROM ElectronicallyErasableProgrammableReadOnly Memory

J1587 Engine/transmission serial data communications link.

J1939 High-speed vehicle serial data communications link.

LED L ight-Emitting Diode—Electronic device used for illumination.

NNC NeutralNo Clutches—Neutral commanded with no clutchesapplied.

OEM Original EquipmentManufacturer—Maker of vehicle orequipment.

OLS Oil Level Sensor—Electronic device (optional) on control modulefor indicating transmission fluid level.

PC PersonalComputer—Needed to run a version of Allison DOC™diagnostic tool.

M H S E R I E S

ABBREVIATIONS ANDDEFINITIONS

64

PD PoweredDownshift—A downshift forced by applying brakes withthe throttle applied. Allison Transmission does not recommendthis procedure.

PDA PersonalDigital Assistant—Used to run a version of AllisonDOC™ diagnostic tool.

PT Part Throttle

PTO Power Takeoff

SCI Serial CommunicationInterface—Used to transmit data andmessages between the diagnostic tool and the ECU and othersystems such as electronically-controlled engines.

ST Step Thru—A downshift forced by applying WOT, just prior to aCT downshift.

TID TransID—A feature which allows the ECU to know thetransmission configuration and provide the correspondingcalibration required.

TPS Throttle Position Sensor—Potentiometer for signaling theposition of the engine fuel control lever.

V Version—Abbreviation used in describing ECU software levels.

VIM Vehicle InterfaceModule—A watertight box containing relaysand fuses—interfaces the transmission electronic control systemwith components on the vehicle.

WOT Wide OpenThrottle

WT World Transmission

WTEC III World TransmissionElectronicControls, Third Generation

65

OWNER ASSISTANCEThe satisfaction and goodwill of the owners of Allison transmissions are ofprimary concern to Allison Transmission Division (ATD), its distributors, and theirdealers.

As an owner of an Allison transmission, you have service locations throughout theworld that are eager to meet your parts and service needs with:

• Expert service by trained personnel

• Emergency service 24 hours a day in many areas

• Complete parts support

• Sales teams to help determine your transmission requirements

• Product information and literature

Normally, any situation that arises in connection with the sale, operation, orservice of your transmission will be handled by the distributor or dealer in yourarea (check the telephone directory for the Allison Transmission service outletnearest you).

Refer to Worldwide Sales and Service Directory (SA2229EN) for the currentlisting of Allison Transmission authorized distributor and service dealers. Thisdirectory is available from SGI, Inc.

We recognize, however, that despite the best intentions of everyone concerned,misunderstandings may occur. To further assure your complete satisfaction, wehave developed the following three-step procedure to be followed in the event aproblem has not been handled satisfactorily.

Step One—Discuss the problem with a member of management from thedistributorship or dealership. Frequently, complaints are the result of abreakdown in communication and can quickly be resolved by a member ofmanagement. If you have already discussed the problem with the Sales or ServiceManager, contact the General Manager. All ATD dealers are associated with anATD distributor. If the problem originates with a dealer, explain the matter to a

M H S E R I E S

CUSTOMER SERVICE

66

management member of the distributorship with whom the dealer has his serviceagreement. The dealer will provide his ATD distributor’s name, address, andtelephone number on request.

Step Two—When it appears the problem cannot be resolved readily at thedistributor level without additional assistance,contact the Allison TransmissionRegional Office responsible for the local distributor.You will be assisted by amember of the Regional Service Manager’s staff, depending on the nature of yourproblem.

For prompt assistance, please have the following information available.

• Name and location of authorized distributor or dealer

• Type and make of equipment

• Transmission model number, serial number, and assembly number (ifequipped with electronic controls, also provide the TCM assembly number)

• Transmission delivery date and accumulated miles and/or hours of operation

• Nature of problem

• Chronological summary of unit’s history

Step Three—If you contacted a regional office and you are still not satisfied,present the entire matter to the Home Office by writing to the followingaddress or calling the phone number below:

Allison TransmissionManager, Warranty Administration – PF9P.O. Box 894Indianapolis, IN 46206-0894800–524–2303

The inclusion of all pertinent information will assist the Home Office inexpediting the matter. If an additional review by the Home Office of all the factsinvolved indicates that some further action can be taken, the Regional Office willbe advised.

When contacting the Regional or Home Office, please keep in mind thatultimately the problem will likely be resolved at the distributorship or dealershiputilizing their facilities, equipment, and personnel. Therefore, it is suggested theabove steps be followed in sequence when experiencing a problem.

Your purchase of an Allison Transmission product is greatly appreciated, and it isour sincere desire to assure complete satisfaction.

67

SERVICE LITERATUREAdditional service literature is available. This service literature provides fullyillustrated instructions for the operation, maintenance, service, overhaul, and partssupport of your transmission. To ensure that you get maximum performance andservice life from your unit, you may order publications from:

SGI, Inc.Attn: Allison Literature Fulfillment Desk8350 Allison AvenueIndianapolis, IN 46268TOLL FREE: 888–666–5799INTERNATIONAL: 317–471–4995

3000MH / 4000MH Series Service Literature

Transmission Model 3000MH 4000MHAutomatic Transmission Fluid Technician’s Guide GN2055EN GN2055EN*Mechanic’s Tips MT3004EN MT3004ENParts Catalog PC2150EN PC2456ENParts Catalog CD-ROM CD2150EN CD2456ENPrinciples of Operation PO2454EN PO2454ENRetail Literature Catalog GN2798EN GN2798ENService Manual SM2148EN SM2457ENTroubleshooting Manual TS2973EN TS2973ENWorldwide Sales & Service Directory SA2229EN SA2229EN* Also Available On The Internet Atwww.allisontransmission.com

M H S E R I E S

68

ALLISON TRANSMISSION DISTRIBUTORS

EASTERN REGION

Atlantic Detroit Diesel-Allison, LLC180 Route 17 SouthLodi, NJ 07644201-489-5800

Penn Detroit Diesel-Allison, Inc.8330 State RoadPhiladelphia, PA 19136-2986215-335-0500

Covington Detroit Diesel-Allison8015 Piedmont Triad ParkwayGreensboro, NC 27409336-292-9240

Western Branch Diesel, Inc.3504 Shipwright StreetPortsmouth, VA 23703757-673-7000

Johnson & Towers, Inc.2021 Briggs Road MountLaurel, NJ 08054856-234-6990

Williams Detroit Diesel-AllisonSoutheast, Inc.2849 Moreland Avenue, S.EAtlanta, GA 30315-0037404-366-1070

New England Detroit Diesel-Allison, Inc.90 Bay State RoadWakefield, MA 01880-1095781-246-1810

69

CENTRAL REGION

Caribe Detroit Diesel-AllisonDivision of GT CorporationCeramic Ind. Park, Campo Rico Ave.,Block CCarolina, Puerto Rico 00982787-750-5000

Inland Detroit Diesel-Allison, Inc.210 Alexandra WayCarol Stream, IL 60188630-871-1111

Central Detroit Diesel-Allison, Inc.9200 Liberty DriveLiberty, MO 64068816-781-8070

Inland Diesel, Inc.13015 West Custer AvenueButler, WI 53007-0916262-781-7100

Clarke Detroit Diesel-Allison, Inc.3133 East Kemper RoadCincinnati, OH 45241513-771-2200

Interstate Detroit Diesel2501 East 80th StreetMinneapolis, MN 55425952-854-5511

Florida Detroit Diesel-Allison, Inc.5105 Bowden RoadJacksonville, FL 32216904-737-7330

Williams Detroit Diesel-AllisonMidwest, Inc.1176 Industrial ParkwayNorth Brunswick, OH 44212-2342330-225-7751

SOUTHWESTERN REGION

Detroit Diesel-Allison De Mexico S.A.de C.V.Av. Santa Rosa No. 58Col. Ampliacion NorteTlalnepantla, Estado de MexicoC.P. 54160(525)6-333-1800

Stewart & Stevenson Services, Inc.2707 North Loop WestHouston, TX 77008713-868-7700

Stewart & Stevenson Power, Inc.5840 Dahlia StreetCommerce City, CO 80022303-287-7441

United Engines, LLC5555 West Reno AvenueOklahoma City, OK 73127405-947-3321

70

WESTERN REGION

Pacific Detroit Diesel-Allison Company7215 South 228th StreetKent, WA 98032253-854-0505

Valley Detroit Diesel-Allison, Inc.425 South Hacienda BoulevardCity of Industry, CA 91745-1123626-333-1243

Smith Detroit Diesel-Allison, Inc.250 West 3900 SouthSalt Lake City, UT 84107801-415-5000

Williams Detroit Diesel-AllisonSouthwest, Inc.2602 S. 19th AvenuePhoenix, AZ 85009602-257-0561

Stewart & Stevenson1755 Adams AvenueSan Leandro, CA 94577-1001510-635-8991

CANADIAN REGION

Detroit Diesel-AllisonBritish Columbia Ltd.9300 192nd StreetSurrey, British Columbia V4N 3R8604-888-1211

Midwest Detroit Diesel-Allison Ltd.1460 Waverley StreetWinnipeg, Manitoba R3T OP6204-452-8244

Detroit Diesel-Allison Canada EastDiv. of Integrated Power Systems Corp2997 Rue WattSte. Foy, Quebec G1X 3W1418-651-5371

Waterous Detroit Diesel-Allison (Div.of Integrated Power Systems Corp)10025 51st AvenueEdmonton, Alberta T6E OA8780-437-3550

Harper Detroit Diesel Ltd.10 Diesel DriveToronto, Ontario M8W 2T8416-259-3281

71

ALLISON TRANSMISSION REGIONAL OFFICES

EASTERN REGIONP. O. Box 400Columbus, NJ 08022-0400609-298-2541

WESTERN REGION39465 Paseo Padre Parkway Suite 3500Fremont, CA 94538510-498-5208

CENTRAL REGIONP. O. Box 894, Speed Code PF06Indianapolis, IN 46206-0894317-242-2327

CANADIAN REGIONP. O. Box 5160 Station ALondon, Ontario N6A 4N5519-452-5256

SOUTHWESTERN REGIONAv. Ejercito Nacional No. 843Colonia GranadaMexico, D.F. C.P. 11520525-901-3057Texas Office: 936-321-4248936-321-4278

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OM3349EN 200210 Printed in U.S.A. 200302

ATD 5376 Op Manual 200302 2/6/03 1:55 PM Page 2