TM 9-816 ( 4- to 5-Ton 4x4 Tractor Truck (Autocar Model U-7.pdf

8/12/2019 TM 9-816 ( 4- to 5-Ton 4x4 Tractor Truck (Autocar Model U-7.pdf

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W R D E P R TM E N T TE C HNIC L M N U L

3

4 -td\ 5-T o n4 x4 T ra ct or T ru c k

A uto c ar M ode l U 7144T

W R DE P RTM E NT 21 M RCH 1 944


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WAR DEPARTMENT TECHNICAL MANUAL

TM 9 816

4- to 5-Ton

4x4 Tractor Truck

(Autocar Model U-7144T)

WAR DEPARTMENT 21 MARCH 1944


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WA R DEPARTMEN T Washington 25, D. C., 21 March 1944

TM 9-816, 4- to 5-ton x Tra ctor Tr uck Autocar M odel U-7144T), is publis hed for the inform ation a nd guidanc e of a ll concerne d.

A.G. 300.7O.O .M. 46 (1 3 Dec 43) 461/ TM-9) Rar . Ars. (3-27- 44)BY ORDER OF T HE SECRETAR Y OF W AR:

G. C. MAR SHALL,Chief of Staff .

OF F ICIA LJ. A . ULIO,

M ajor G enera l,The Adju tant Gen eral.

DIS T RIBUT ION: X .

Fo r explanation of symbols, se e F M 21-6.)


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*TM 9-816

CONTENTS

PART ONE VEHICLE OPERATING INSTRUCTIONS

Paragraphs Pages

SECTION I. Introduction ............................ 1 5

II. Description and tabulated data 23 5 8

III. Driving controls and operation 4 6 9-15

IV. Operation under unusualconditions ............................ 7- 10 15- 23

V. First echelon preventive maintenance services .................. 11- 15 23- 35

VI. Lubrication ........................ 16- 17 35- 45

VII. Tools and equipment stowageon the vehicle ....................... 18 46-49

PART TWO VEHICLE MAINTENANCE INSTRUCTIONS

SECTION VIII. Vehicle modification records.. 19 5 0

IX. New vehicle run-in test ........... 20- 21 50- 5 5

X. Second echelon preventivemaintenance ........................ 22 55- 85

XI. Organization tools andequipment ......................... 23 85

XII. Trouble shooting .................... 24- 45 85-107

XIII. Engine data, maintenance, andadjustment in vehicle. ........ 46 5 5 107 119

XIV. Engine removal andinstallation .......................... 56- 5 7 119-130

XV. Clutch ...................................... 58- 60 130-134

XVI. Fuel system ............................ 61- 66 134-143

XVII. Intake and exhaust system...... 67- 71 143-147

jVThis manual supersedes pertinent information in TB ORD-20, 24 Jan 44 and OFSTB 800-21,30 Nov 43. This manual includes pertinent information from TM 10-1569, 6 Mar 42. Togetherwith TM 9-1816 and TM 9-1832A, this manual supersedesTM 10-1569.


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TM 9-816

4- TO 5-TON x TRACTOR TRUCK AUTOC ARMODEL U-7144T)

CONTENTS-Con t'dParagraphs Pages

XVIII. Cooling system ........................ 72-78 148-157

XIX. Ignition system ........................ 79-85 157-165

XX. Starting and generating

systems ................................ 86-92 165-174XXI. Transmission ......................... 93- 95 175-179

XXII. Transfer case .......................... 96- 99 179-181

XXIII. Propeller shafts and universaljoints .................................. 100-103 181-184

XXIV. Front axle ............................. 104-107 185-187

XXV. Rear axle ............................... 108-110 187-189

XXVI. Service brake system ........... 111-127 189-212

XXVII. Propeller shaft brake system 128-132 212-215

XXVIII. Wheels, hubs, wheel bearings,and tires .............................. 133-135 216-219

XXIX. Springs and shock absorbers 136-138 220-225

XXX. Steering gear .......................... 139-143 225-228

XXXI. Body and frame...................... 144-152 228-235

XXXII. Battery and lighting system.... 153-168 235-249

XXXIII. Instruments ............................ 169-176 250-255

XXXIV. Fifth wheel .............................. 177-179 25 6

XXXV. Radio noise suppression ........ 180-184 257-261

XXXVI. Shipment and temporarystorage ................................ 185-187 261-265

REFERENCES.......................................................................... 266-267

INDEX..................................................................................... 268-280

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TM 9-8 161-2

PART ON E EHICLE OPERATING INSTR UCTIONS

Section I

INTR ODUCTION

1. S COPE.*a. T his Technical M anual is p ublished for the information and

guidance of the using arm personnel charged with the operatio n, maintenance, and minor repair of th e materiel.

b . In addition to a description of the 4- to 5-ton 4x4 TractorTruck (Autocar Model U -7144T), thi s ma nual contains tec hnica linformation required for the id en tification, use, and care of the mater iel. The manual is divided into two parts. P a rt one, section I throu ghsection VII, gives operating instruc tions . Part two, section V IIIthrough section XXXVI, .gives vehicle maintenance instructio ns tous ing arm personnel charged with the re sponsibility of doing maintenanc e work withi n their juris diction.

c. In all ca ses whe re the nature of the repair, modifications, oradjustm ent is beyond the scope or facilit ies of the uni t, the res ponsibleordnance service sh ould be inform ed so tha t trained p ersonnel withsuitable too ls and equipment ma y be provided, or proper instructionsissued.

Section II

DESCRIPTION A N D TABUL ATED DATA

2. D ESCRIPTION (figs. and 2).a. The 4- to 5-ton 4x4 Tract or Truck (Autocar Mod el U- 7144T)

is a cab-o ver-engine vehicle. Power is furnis hed by an RXC modelHercules engine. Wh e n necessary power can be transmit ted to thefront wheels th rough a centr ally lo cated transfer case. Hub constructio n allo ws the wheels to b e mo unted dually at both front an d rear.A s upport bracket behind the cab carr ies two spare tires. A largerectangular tank attached to th e frame midway bet ween the whee lson the left side carrie s fuel. A battery box and two a ir reservoir

tanks are located in a similar positi on on the right side.b. T his tractor truck is man ufactured in both open and closed cab-

type vehicles.

*To provide operating instructions with the materiel, this T echnical Manual h asbeen published in advance of complete te chnical rev iew. Any errors or omissionswill be corre cted by cha nges or, if extensive, by an early revision.


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TM 9 8162-3

4 TO 5-TON x TR ACTO R TRUCK AUTOCA R MODEL U -7144T)

CO WL VENTILATOR

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TO O L BO X

RESERVO IR TA N K S

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BR USH TOWI NG RA PDGU RD HOO K 779 56

Figure Tr u c k Righ t Front

3 D T

a Veh icl e Specifi cations

M odel .... ............... .............. ............... ............... ............... ...... U-7 144T

Wheel bas e ..... . .............. ............... ............... ............... ........... 1 34i/ in .Length, over-a ll ............... ............... . .............. ............... .......... 203 V a in .Widt h , ove r-a ll ........... ............... ............... ............... ............... . 95y le in .Height, o ver -all .. .............. ............... ............... ............... ......... 112 in .

T ire:Size ......... .............. .. ............. .. ............. ............... ............... ... 9 x 2 Typ e ... .............. ............... ............... ............... .......... 10-ply lug tre adT read (ce n ter to ce nter)

F ront .... . .............. ............... ............... ............... ............... . 73 in.Re ar (i nsid e) ........ ............... ............... ............... ............. S9 /4 in .Rear (ou tside) ................ ............... ............... ............... ... 84Vi in .

W eight of v ehi cle:Emp ty ......... ..............: ............... .............. ......:........ . ........... 11 660 IbL oaded .. .. ............. .. ............. . ............. .. ............. .. ............. .. .. 21 010 Ib

Grou nd cleara nce :F ron t ........ .. ............. .. ............. .. ............. . ............. .. ............. .. 11 in.Rear ............... ............... .............. ............... . .............. ............ 12 i in .

Pin tle he ight ..... ............... ............... .............. .. ............. ............... . 38 in .G rade of fuel........ . ............. .. ............. .. ............. .. .......... 68 octan e (min )


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TM 9 -8 1 6 3

DESCRIPTION A ND TABULATED D T

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TM 9-816

4- TO 5-TON x T RACTOR TRUCK A U T O C A R M O D E L U-7144T)

b. Performance.

Speeds allowable:

Without front wheels driving:First gear ............................................................................ 5 mphSecond gear ........................................................................ 9 mphThird gear ........................................................................ 18 mphFourth gear ...................................................................... 33 mphFifth gear .......................................................................... 41 mph

With front wheels driving:

First gear ............................................................................ 5 mphSecond gear ........................................................................ 9 mphThird gear ........................................................................ 10 mphFourth gear ...................................................................... 10 mphFifth gear .......................................................................... 10 mph

Minimum turning radius................................................................ 30 ft

Towing facilities:

Front ................................................................................ Two hooks

Rear .................................................................................. One pintle

Maximum drawbar pull............................................ 450 Ib (4th gear)

Maximum governed engine speed........................................ 2,300 rpm

Miles per gallon............................................................................ 3 to 5

Cruising range ........................................................................ 180 miles

c. Capacities.

Transmission capacity:

Summer ...................................................................................... 7 qtWinter ........................................................................................ 9 qt

Transfer case capacity.................................................................... 2 qt

Front axle capacity.......................................................................... 8 qt

Rear axle capacity ........................................................................ 10 qt

Fuel capacity .............................................................................. 60 gal

Cooling system capacity .............................................................. 40 qt

Crankcase capacity ...................................................................... 12 qt

Oil bath air cleaner capacity............................................................ 3 pt

Steering gear capacity ................................................................ IVi pt

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TM 9 -816

S e ct ion III

D RIVIN G CONT R OLS AN D O PERA TION

4. C O N T R O L S

a Transfer Case Shif t Lever fig. 3). This lev er is loc ated in the cab bet ween th e main tran sm ission ge arshift leve r and the f rontaxl e declutchin g lever, and is used to engage th e hig h a nd low speedgears in the trans fer case. N OTE: Th e low spee d g ear cann ot beengaged unless th e fron t ax le d ecl utch leve r is in th e IN p ositio nfig. 3).

h Front Axle Declu tch L ever fig. 3 ). T his lev er is lo cated at

rig ht of t ransfe r case shift leve r. It en gages and d iseng ages the frontaxle d rive. Pla ci ng it in the IN pos iti on automat ical ly carrie s thetransfer case shi ft lev er to the L OW range p osition. D eclutch lev erca n be operated independen tly only whe n the transf er case shif t le veris in the HIGH range.

c Main Tran smission G earshift Le ver fig. 3 ) . This lev er isloca ted a t the left of trans fer ca se shift leve r, and is us ed to sh ift a llgears in the main trans m ission.

d Prop ell er Sha ft Br ake L ever fig. 3) . Thi s lever, loca ted n extto the ope rator, c o ntrols the prope ller sh aft brake a t the re ar of thetra ns fer case.

e. Service B rake Pedal fig. 3). Th is pedal is lo cat ed on th e rightside of the steering column, a nd operate s th e service brake to s topvehicle.

f. Cl u tch Pedal fig. 3). Th e clut ch pe dal, lo cated at the lef tside of the steerin g co lumn, is u sed to eng age and dise ngage the cl utch .W he n properly adjusted, th e clutch has approxima tely IVz inc hes offre e tra vel befo re it starts to re lea se.

g Cranki n g Motor S witch fig. 19). This swi tch is loc ated onthe lo or board in fron t of the operator's se at, an d is used to com pl eteelect ric circuit b etwe en batt e ry and cra nki ng motor .

h. F oot Dimm er Switch fig. 3). Th is swi tch is loc ated on the floor board a t the lef t o f the clut ch pedal, a nd is used to raise and lower the headlight b eam .

i V isco sity Ga ge fig. 3). Th is gag eis

lo cated onth e

left side of the instrum ent panel, a nd indicates th e vis cosi ty of the en gine o il

in terms of thin, ide al, or he av y.

j. Amm eter fig. 3) . This gag e is loc ated on the left side of the instrum en t panel. It indicate s generator o utput in a mpere s var yingwith engi ne speed fro m 0-30.


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TM 9 81 64

DRI V ING CONTROLS N D O PERATION

O

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TM 9-816

4 TO 5-TON 4x4 TRACTOR TRUCK AUTOCAR MODEL U-7144T

k. Auxi liary Ammeter (fig. 3). This gage is located on the leftside of the instrument p anel to the right of the am meter. It indicatesthe charge or discharge operation of the auxilia ry 6-volt b attery.

1 Air Pressure Gage (fig. 3). This gage, located a t the centerof the instrument pan el, shows the am ount of air pressur e available in th e service brake system.

m . Tachometer (fig. 3). The tachometer is locate d at the centerof the instrum ent panel. The b lack hand shows engine speed in re v olutions pe r minute. The inst rument is equipped with a key th at isused to reset the red hand w hich registers the highest revolution s perminut e the engine has been operate d.

n. Speed ometer (fig. 3). This gage is loca ted a t the center of theinstrument panel. It indicates road speed and records total milesa nd trip miles.

o. Oil Pressure Gage (fig. 3). Th is gage is located at the centerof the instrument p anel at the right side, and indicate s oil pr essure.

p. Temperature Gage (fig. 3). This gage is located on the rightside of the in strument panel, and indicate s temperature of fluid in the

engine cooling system.q. Fuel Gage (fig. 3). T his gage is locat ed on the righ t side of

the instrum ent panel. It shows the quantity of fuel in the fuel tank,wh en ignition switch is tur ned on.

r. Wind shield Wiper Regulator Valves (fig. 3). These twovalves are located on the left side of the instrum ent panel, and th e irfunction is to control the speed of th e two w iper arms

s Headligh t and Blackout Light Switch (fig. 3). This switchis located on the instrume nt panel behind the steering column. Itcontrols all lights and ope rates in four positions

t. Choke Contr ol. This co ntrol is located at the cent er of theinstrum ent pane l. It is used to red uce the amount of air admitted to the carburetor, thu s giving various deg rees of a riche r fuel mixture.

u. Ignit ion Switch (fig. 3). This switch is located at the centerof the instr ument pa nel, and controls the engin e electrical supply.

v. Throttle Control (fig. 3). This c ontrol is located at the centerof th e instrument panel to the right of the ignition switch. It servesas a hand throttle to increase or reduc e engine speed.

w. Instrument Lightin g Switch (fig. 3). This swit ch is loca tedon the right side of the instrument pan el. It is a rhe ostat type switchwhich controls instrumen t pan el lights when the headlight and b lackout light switch is in third po sition.

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TM 9-81 65 6

4- TO 5-TON 4x4 TRACTOR TRUCK AUTOCAR MODEL U-7144T)

press clutch pe dal again , an d place gearshift lever in secon d position (fig. 4 ). R elease c lutch and increase engine speed. C AUTION: Donot exc eed 2 400 revolutions per m inute

a s indicated by tachometer(fig. 3). Repea t this oper ation, passing through a ll the gears consecutively u ntil the highest gear is reached at which the engine pullswithout laboring. To shift to a lower gear, use the same pro c edureas fo r shi fting to a higher gear, with the follo wing exc eption: Whengearshift lever is in neutral position and clutch is momentarily engaged,acceler a te engine to approximate speed req uired to propel vehicle atthe same speed in the lo w er gear. Then dis engage clut ch an d quicklyshift to lower gear.

d. Stoppin g th e Vehicle. C lose th rottle by removing foo t from the accelerator pedal. App ly brake carefully by de pressing servicebrake pedal. When the vehicle is nearly stopped, diseng age clutc h,a nd mov e m ai n transmission g earshift lever in ne u tral positio n. Whentruc k sto ps, apply propeller shaft brake; then release clutch and servicebra ke pedals.

e . Stopping t he Engine. To stop engine, turn ignition switch toOFF position, making sure switc h is completely open to avoid run

nin g down battery.

6. TOWING OF VEHICLE.

a. Towing To Star t Vehicle. Attach towing ca ble to towingho oks, also attach air line from towin g tru ck to air line of truck to betowed , if possible. P lace front axle decl utch lever (fig. 3) in OUTposition (fig. 4), a nd move transfe r case shift lever to HIGH position (fig. 4). Sh ift m ain transmi ssion gearshift lev er to the No. 5 or

OVERDRIVE po si tion (fig. 4). Pull out choke an d throttle intosa me position as for startin g, and tu rn ignition switch to ON position. Release pro peller shaft brake lever and depre ss clutc h p edal.Engage clutch by rele a sing clutch pedal slowly when tow ing speed isreac hed. When engine starts, disenga ge clutch, and adjust controlsuntil engine runs sm oothly. If n ecessary to stop vehicle before enginestarts a nd air is not ava ilable from towing vehicle, use prop ell er shaftbrake with extreme care.

b. Towing Disabled Vehicle. Check tires fo r proper inflation tomake towing easier (par . 135). Attach towing cable to tow ing hooks.Connect air supply from to wing vehicle, if any, to tr ailer conn e ctionsbehind front bu mper of vehicle to be towe d. Move the front axledeclutch lev er to the OUT position (fig. 4 ), and pl ace main tra nsmission gearshif t leve r in ne utral position (fig. 4) . Push propellersha ft b rake lever all the way do wn to the released position. If a irsupply is not connected, this bra ke pro vides the only possible meansfo r s topping. CA U TION: Be careful in using prop eller sha ft brake

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TM 9 8166 7

OP ERATION UNDER UNUSUAL COND ITIONS

because it is extremely se vere. If necessary to hois t fro nt en d of truckattach lifting tackle to bumpe r, using care to avoid crushin g air tubing.

Use necessary bl ocking between tow truck and bum per to preven tvehicle from running into tow truck. If n ecessary to hoist rear oftruck, wrap chain aoun d the entir e frame immediately in fr ont of rea rspring re ar bracket, making sure to get chain between spr ing a nd frameso tha t frame will c arry the load. A ttach nec essary blo cking betweentow truck a nd rear frame rail to prevent collision. Straighten fr ontwheels , and clamp the steering wheel to p revent turning.

ec t ionIV

OPER ATION UNDER UNUSUAL ON ITION S

7 CO LD W EATHE R OPERATION a Purpose. Operation of a uto motive equipment at sub-zer o

temperatures presents problems that demand sp ecial precautions andextra caref ul servicing from both operat ion and maintenance personnel,if poor performance and total func tional failure are to be avoided.

b Gasoline. Winter grade of gasoline is designed to reduce coldweathe r starting difficulties; therefore the w inter grade fuel should beu sed in cold weath er operation.

c. Storage and Handlin g of Gasoline. D ue to condensat ion ofmoi sture from the air, water will accum ulate in tanks, drums, and containers. At low temperatures, this water will for m ice crystals thatwill clog fuel lines and car buretor jets unless the following pre cautionsare taken:

1) Strain the fuel through filter paper, or any other type of

s trainer that will prevent the passage of wate r. CAUTION: Gasolineflowing over a surface ge nerates static electricity that will r esult in aspark unless means are pro vided to ground the electrici ty. Alwaysprovide a metal lic conta ct between the co ntainer a nd the tank toassure an e ffective gr ound.

2) Ke ep tank full, if possible. The more fu el there is in the tank,the smalle r the volum e of air will be fr om which mois ture can becondensed.

3) A dd V z pint of denatured al cohol, Grade 3, to the fuel tank

e ach time it is filled. This will reduce the ha zard of ice formation inthe fuel.

4) Be sure that all contain e rs are thoroughly clean and free fro mrust before s torin g fuel in them.

5) If possible, aft er fi lling or mov ing a containe r, all ow the fuelto settle bef ore filling fuel tank from it.

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TM 9 8167

4 TO 5-TON x TRACTOR TRUCK AUTOCAR MODEL U-7144T)

6) Keep all openings of containers tight to prevent snow, ice,dirt, and other foreign matter from entering.

7) Wipe a ll snow or ice from dispensing e quipm ent and fromaround fuel tank filler cap before removing cap to refuel vehicle.

d . Lubri cation

1) TR ANSMISSIONA N D DIFFERENTIAL. a) Univers al gear lu bricant, SA E 80, wh ere specified on figures

5 and 6 or War Dep artment Lubrication Gu ide No. 502, is suitab le fortemperatures as low as 2 F . If consisten t temperature below 0 Fis anticipa ted, drain the gear cases while warm, and refill with Grade75 universal gear lubrica nt, which is suitable for operatio n at all tem peratures below 0 F . If Grade 75 universal ge ar lubr icant is notavailable, SAE 80 universal gear lu bricant diluted wi th the fuel used b y the engine, in the pro portion of one par t fu el to six part s universalge ar lub ricant, m ay be used. Dilute m ake-up oil in the same proportionbefore it is added to gear cases.

b) After engine h as been warmed up, engage clutch and maintainengine speed at fast idle for 5 minutes, or until gears can be engaged.Put trans mis sion in low (first) gear, and dri ve vehicle for 100 yards,be ing careful not to stall the engine. This will heat gear lubricants tothe point where normal op eration can be expected.

2) CHASSISPOINTS. Lub ricat e chassis points with general purpose grease, No. 0.

3) STEERINGG E A R HOUSING. Drain housing, if possible, or usesu ction gun to remove as much lubricant as possible. R efill with universal gear lubricant, Gra de 75, or, if not available, S A E 80 universalgear lubricant diluted with fuel used in the engine, in the pr oportion

of one part fuel to six parts S AE 80 universal gea r lubr icant. Dilutemake-up oil in the same pro portion before it is added to the housing.

4) OILC ANPOINTS. For oilcan points where engine oil is prescribed f or above 0 F, use light lubricating preservativ e oil.

(5) P R E C A UT I O N Sa) Keep crank case oil fluid by one of the following me thods,

lis ted in order of prefer ence:1 Kee p vehicle in a heated enclosure when not in use.

2 After stopping engine, d rain crankcas e oil while still hot. P lacewarning tag in a co nspicuous place in the cab to ind icate crankcaseis empty. Store oil in a warm place if possible; otherwise, heat oilb efore reinstalling.

3 C over entire cab and engine sectio n wi th tarpaulin. Place firepots under tarpaulin about 3 h our s before en gine is to be started . APrimus, Van Prag, or other type blowtorch, and ord in ary kero sene

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OPERATION U N D E R UNUSUAL CONDITIONS

lanterns may be used. CAUTION: Be careful in applying flamedirectly to oil pan.

4 . Do not move the vehicle from a warm place into subzero temperature, unless necessary.

5 . Park vehicle without setting propeller shaft brake to avoidbrake freezing. Block wheels to prevent rolling of vehicle, and keepa blowtorch handy to thaw frozen propeller shaft or service brakes.

6. Inspect vehicle frequently for broken screws, bolts, or othermetal parts, and for loosened nuts.

7. Dilute crankcase oil with gasoline, or with Diesel fuel in anemergency. Turn engine over several times to mix oil and diluent.After 4 or more hours of operation, redilute oil if vehicle is to be leftstanding unprotected for 3 or more hours. Use diluent for bothoriginal dilution and redilution as follows:

Temperature Diluent Quantity

0 F to -20 F Gasoline l/2 qt to each 4% qtof engine oil

0 F to -20 F Diesel fuel Vz qt to each 3 V qtof engine oil

Below-20 F Gasoline 1 qt to each 5 qtof engine oil

Below -20 F Diesel fuel 1 qt to each 4 qtof engine oil

NOTE: Presence of diluent increases engine oil consumption. Checkoil level frequently.

e. Protection of Cooling Systems.

(1) USE ANTIFREEZECOMPOUND. Protect the system with anti

freeze compound (ethylene-glycol type) for operation below +32 F.The following instructions apply to use of new antifreeze compound.

(2) CLEAN COOLING SYSTEM.Before adding antifreeze compound, clean the cooling system, and completely free it from rust.If the cooling system has been cleaned recently, it may be necessaryonly to drain, refill with clean water, and again drain. Otherwiseclean the system with cleaning compound.

(3) RE PA I RLEAKS. Inspect all hose and replace if deteriorated.Inspect all hose clamps, plugs, and pet cocks, and tighten if necessary.Repair all radiator leaks before adding antifreeze compound. Correctall leakage of exhaust gas or air into the cooling system.

(4) ADD ANTIFREEZECOMPOUND. When the cooling system isclean and tight, fill the system with water to about one-third capacity.Then add antifreeze compound, using the proportion of antifreezecompound to the cooling system capacity indicated below. Protect

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the system to at least 10 F below the lowest temperature expectedto be experienced during the winter season.

ANTIFREEZECOMPOUND CHARTF OR 40-QUART CAPACITY OOLING SYSTEM)

Antifreeze CompoundTemperature Ethylene-glycol Type)

+30 F 5qt+20 F 7V qt+ 10 F 10 qt

OF 12V qt-10 F 15 qt-20 F 17 y qt-30 F 20 qt-40 F 22V qt-50 F 22V 2 qt-60 F 25 qt-70 F 25 qt

(5) WA R M THE ENGINE. After adding antifreeze compound, fillwith water to slightly below the filler neck; then start and warm theengine to normal operating temperature.

(6) TEST STRENGTHO F SOLUTION. Stop the engine and checkthe solution with a hydrometer, adding antifreeze compound if required.

(7) INSPECT WEEKLY. In service, inspect the coolant weeklyfor strength and color If rusty, drain and clean cooling systemthoroughly, and add new solution of the required strength.

(8) PRECAUTIONS. a) Antifreeze compound is the only antifreeze material author

ized for ordnance materiel. b) It is essential that antifreeze solutions be kept clean. Use

only containers and water that are free from dirt, rust, and oil. c) Use an accurate hydrometer. To test a hydrometer, use one

part antifreeze compound to two parts water. This solution willproduce a hydrometer reading of 0 F.

d) Do not spill antifreeze compound on painted surfaces.

f. Electrical Systems.

(1) GENERATOR AND CRANKING M O TO R Check the brushes,commutators, and bearings. See that the commutators are clean. Thelarge surges of current which occur when starting a cold engine require good contact between brushes and commutators.

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( 2 ) WIRING. Check, clean, and tighten all connections, especiallythe battery terminals. Be sure that no short circuits are present.

(3) COIL. Check coil for proper functioning by noting qualityof spark.

(4) DISTRIBUTOR. Clean thoroughly, and clean or replace points.Check the points frequently. In cold weather, slightly pitted pointsmay prevent engine from starting.

(5) SPARK PLUGS. Clean and adjust spark plugs or replace, ifnecessary. If it is difficult to make the engine fire, reduce the gap to0.005 inch less than that recommended for normal operation (par.83 e (2) ). This will make ignition more effective at reduced voltages

likely to prevail.(6) TIMING. Check the timing carefully. Be sure that the spark

is not unduly advanced nor retarded.

( 7 ) BATTERY. a) The efficiency of batteries decreases sharply with decreasing

temperatures, and becomes practically nil at 40 F. Do not try tostart the engme with the battery when it has been chilled to temperatures below 30 F, until battery has been heated, or unless a warm

slave battery is available. See that the battery is always fullycharged, with the hydrometer reading between 1.275 and 1.300. Afully charged battery will not freeze at temperatures likely to beencountered even in Arctic climates, but a fully discharged batterywill freeze and rupture at +5 F.

b) Do not add water to a battery when it has been exposed tosubzero temperatures unless the battery is to be charged immediately.If water is added and the battery not put on charge, the layerof water will stay at the top and freeze before it has a chance to

mix with the acid.(8) LIGHTS. Inspect the lights carefully. Check for short cir

cuits and presence of moisture around sockets.

(9) ICE. Before every start, see that the spark plugs, wiring, orother electrical equipment are free from ice.

g. Starting and Operating Engine.

(1) INSPECT CRANKINGMOTOR MECHANISM.Be sure that noheavy grease or dirt has been left on the cranking motor throw-out

mechanism. Heavy grease or dirt is liable to keep the gears frombeing meshed, or cause them to remain in mesh after the engine startsrunning. The latter will ruin the cranking motor and necessitaterepairs.

(2) USE O F CHOKE. A full choke is necessary to secure the richair-fuel mixture required for cold weather starting. Check the butter-

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fly valve to se e that it c loses all the way and otherwise f unctionsproperly.

3 )C A R B U R E T O R N D

FUEL PUM P. The carbureto r, which willgive no apprecia ble trouble at no rm al tem perature s, is liable not to operate satis factorily a t low te mperatur es. Be sure the fuel p ump hasno leaky valves or diaphra gm as this will p revent the fuel pu mp from delivering the amount of fu el required to sta rt the engin e-at low te mperatu res when runnin g speeds are red uced to between 30 and 60revoluti ons per minute. '

4) AIR C L E A N E R At tem pera tures belo w 0 F do not use o l inair cleaners. The o il will congea l an d p revent the ea sy flow of air.

Wash screens in dry- cleaning so lv ent dr y and rep lace . Ice and fro stfor mations on the air cleane r scre ens can cau se an abnorm ally highintake v acuum in the car b uretor air horn hose resulti ng in c ollap se.

5) FUEL SYSTEM. Rem ove and clean se dim ent bowl stra inersetc. daily. Al so drain fuel tank sump daily to rem ove water and di rt.

h . Ch assis.

1) BRAKE B A N D S Brake bands particula rly on new vehic leshave a te ndency to bind w hen they are very cold . Alw ays hav e a bl owtorch h andy to warm up these p arts if they bin d prior to moving ora ttempting to mo ve the vehicle. Parking the vehic le with the brake released will elim inate most of the binding. Pr ec aution must be ta ken,under th es e circumstance s to block the wh eels or otherwise preven tmov eme nt of the vehi cle.

2) EFFECT O F Low TEMPERATURES O N METALS. Inspect thevehicle fre quently. Shock resis tance of meta ls or resistance againstbreaki ng is greatly redu ced at ex tremely low temperatu res. Ope rationof vehicles on hard frozen ground ca use s strain and jo lting which willresult in screws breaking or nu ts jarr ing loose.

3) SPEEDOMETERC A B L E D isconnect the oil-lubric ated sp eedometer c able at th e drive end when operati ng the vehicle at tem peratur es o f 3 F and b elow. T he cable w ill often fail to w ork properly at the se tem perat ures, an d some tim es will break du e to the excessive drag caused b y the high visc os ity of the o l with which it is lubric ated .

8. HOT WEA TH ER OPERATIO N.a. Ge neral. Operation of these vehicl es in high temp eratur es

requires regular maintenanc e of cooling un its lubri cation -filtering de vices and air cleaners. In e xtremely hig h temperatu res, w ater-sav ingde vices such as sur ge or overfl ow ta nks should be em plo yed. Avoidthe co ntinuous use of low gear ra tios wheneve r p ossib le. M ake frequent ins pect ions and serv icing of air clean e rs fuel filter and o l filterif sid e panels ar e remo ved during operat ion in dusty area s . Watch thetemp erature and oil g ages c onsta ntly. Check and replenish o l and

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water frequently. CAUTION: Inspect vehicl e frequently for brokenscr ew s, bolts or other metal parts and for loos ened nuts.

b. Cooling Sys tem M aintenance.

(1) COOLING LIQUID. Formation of scale and rust in coo ling system occurs more often during operation in extremely h igh tem peratures; therefo re rust pr eventives should always be add ed to the coolingliquids. U se only clean wat er. Avoid the use of water that conta insalkali or other s'ubstance s w hich may cause scale and rust form ations .

(2) C O O L IN G SYSTEM. Thoroughly clean and flush the coolingsystem at frequ ent intervals when o perating in extremely high temperatures.

(3) FAN BE LT N D WATER PUMP. Inspect fan belt at reg ularintervals and adjust if nece ssary (par. 78). Water pump must be k ep tin g ood op erating condition.

(4) TH ERMOSTAT. Che ck operatio n of the rmostat (par. 76).Thermo stat must open at calibrated temperatu re to prevent overheating of coolin g liquid.

(5) HO S E CONNECTIONS.Check hose conne ctions frequently forleaks.

c. Hot, D ry Climates.

(1 ) Keep cooling system full of recomm ended coolant and maintain proper level of correct grade of lubricating oil in lubri cating system. Check engine temperature fre quently, and if temperature risesto 212 F, stop engine and insp ect coolin g system. Flus h cooling system if necessary; look for sand in radiator fins; blow out with co mpre ssed air, if available.

(2 ) Under desert conditions, check oil filter, carburetor, air cleaner,and air compress er ai r filter every few hours, and service as necessary.

(3) Under sandy con ditions, use lubricants sparingly and cleanall sand from fittings before lu bricating.

(4) Avoid touching machined surfaces whe n making repairs.(5) Do not park vehicle in sun for lon g p eriods, becau se this

shortens lif e of tires. If possible, place vehicle under cover to protectit from sand and dust. Co ver inacti ve vehi cles with tarpaulins if nosuitable buil ding is available.

d. Hot, Damp Climates.

(1) Keep cooling system c lean and filled with clea n, fresh (notsalt) water. Use soft wate r when possi ble. Note engine temperat ureas re gistered by temperature gage frequ ently. Stop vehicle immediately if tem perature of engine reach es 212 F.

(2) Protec t exterior surfaces from atmosphere by renewing painton all pain ted surfaces, and keeping a film of light engin e oil on unfinished exterior metal surfa ces.

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(3) Flush metal surfaces which have been exposed to salt waterwith fresh water, and a pply a film of light engine oil to unfinished metalparts.

(4) Make frequent inspections of s tored ve hicles. Remove corrosio n fr om exterior su rfaces with flin t paper 2/0 (from machi ned surfaces with crocus cloth) , and apply a protective coating of p aint, oil, orrust-pre ventive compound.

e. Battery.

(1) WATER L E VEL. In torr id zones, cell water level should bechecked daily and replenished if necessary with pure distilled water.If this is not available, any water fit to drink may be used. However,continuous use o f water with high mineral content w ill eventuallycause damage to ba ttery and sho uld be avo ided.

( 2) SPECIFICGRAVITY. Batteries op erating in torrid clim atesshould have a weaker elec trolyte than for temperate climates. Inst eado f 1.300 gravity, the electroly te should be adjusted t o around 1.210 to1.230 for a fully charged battery. This will prolong the life of the negative plates and se parators. Un de r this conditio n battery should berecharged at abou t 1.160. Whe re freezing co nditions do not prevail,there is no danger with gravities fro m 1.230 to 1.075.

(3 ) SELF-DISCHARGE. A batt ery will self-discharge at a g reater rateat high temperatures if standing for long periods. This must b e taken into consideration when operating in torrid zones. If necessary to parkfor sev eral days, remove ba ttery and store in a cool place.

9. OPERATION IN MUD, SNOW, IC E SAND, AND FLOOD.

a. Mud. Install tire chains on both re ar wheels, and select loweno ugh gear ratio to move vehicle steadi ly witho ut putting unduedriving strain on engine and axles.

b. Snow and Ice. Skidding is th e general hazar d encoun tered in

these co ndition s. Install chains, and select the prope r gear ra tio tomove the vehic le steadily, without imposin g undue st rain o n engin eand axle. When skidding occurs, tu rn the front wheels in the sam edirection th at the rear end is skiddi ng. Decelerate the engine, andappl y brakes very gradual ly until vehicle is under contro l. Proceedwith caution. Re move chains as soon as their use is no longer necessary.

c. S and. The main object ive when drivi ng in sand is to avoidthe possibility of spinning th e d riving wheels. If possible, lay an im provised t rack with planks or bru sh in order to prevent the wheelscoming in contact with the loos e footing. Do not let the motor labor.Reverse and go forward several times if necessary, until a solid roadbed is rea ched.

d. Flood. Know the fording depth of this vehicle, an d do notex ceed its known limit s. Reduce the vehic le speed to 4 miles per ho ur

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and proceed w ith caution. Exercise care to avoid water dam age toelectrical and driving system s. Lubricat ed parts wh ich have beenaffected by mud and water must be serviced at ear li est oppor tunity.

e. Pr ecautions. Do not al low mud, snow, or ice to cake on w heels,slac k adjuster s, steering knu ckles, and steering ar ms, or to gather onthe air system safety valve, oil filter, or air filter openings. Inspect andcl ean mud, snow, or ice off radiator core, fan, and fan be lts. Keep mudsnow, ice, and mo isture off all electrical connections.

10. DECONTAMINATION.a. Poisonous Gas. Removing and destroying dange rous chemical

agents encountered when operati ng in affected areas is k nown as decontaminatio n and is covered by instructio ns con tained in FM 17-59.

Section V

FIRST ECHELON PREVENTIVE MAINTENANCE S ERVICES

1 1. PURPOSE.

a. To insure mechanical efficiency, it is necessary that the vehiclebe sy s tematically inspected at intervals e a ch day it is operated aswell as weekly, so that defect s may be discovered and corrected be forethey result in serious damage or fail ure. Certain scheduled maintenan ce service s will be p erformed a t these de signated interva ls. The servicesset forth in this sec tion are those performed by driver or crew before-operation, during-op eration, at-halt, and after-operation , and weekly.

b. Driver pre ve ntive maintenance services are lis ted on the backof Driver's T rip Ticket and Preventive Mainten ance Service R ecord

W.D. Form No. 48 to cover vehicles of a ll types and models. Itemspec uli ar to specific vehicles but not listed on W.D. Form No. 48 ar ecove red in manual procedure s unde r the item s with which they arerelated . Certain ite ms listed on the for m that do n ot pertain to thevehicle involved are eliminated from the proced ure as written intothe manual. Every organization must th oroughly school each driverin performing the m aintenan ce proce dures set forth in manua ls w hetherthey ar e listed specifi cally on W. D. Form No. 4 8 or not.

c. The ite ms listed on W. D. F orm No. 48 that apply to this vehicle

are expanded in thi s manual to provide specific procedu res for accomplishm ent of the inspections an d ser vices. These services are arrangedto facil itate inspection and conserve the time of the driver, and are notn ecessarily in the same n umerical ord er as shown on W.D. Form No.48. The item nu mbers, however, are ide ntic al with those shown onthat form.

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d. The general inspect ion of each item applies also to a ny supporting memb er or connection, and generally inc ludes a check to seew hether the item is in good conditio n, correctly assembled, secure, orexcess ively worn.

e. The inspection for good con dition is usually an external visual inspectio n to determine whether the unit is damaged beyond safe orser viceable limits. The term good condition is exp lained further byth e following terms: not bent or twist ed, not chafed or burned, notb roken or cra cked, not bare or frayed, not dented or collapsed, not tornor cut.

f. Th e inspecti on of a unit to see that it is correctly assembledis usually an exte rnal visual inspection to see wh ethe r it is in its normalassembled position in the vehicle.

g. The ins pection of a unit to determ ine if it is secure is usuallyan external vi sual examinati on, a wrench, ha nd-fe el, or a pry-b ar checkfor looseness. Such an inspection should include any br ackets, lockwashers , lock n uts, lock wires, or cotter pins u sed in assembly.

h. Exce ssively worn will be underst ood to mean worn close to,or beyond serviceabl e lim its, and likely to result in a failure if notrep laced before the next sched uled inspection.

i. Any defects or unsatisfact ory operating characteristics beyon dthe sco pe of first echelon to correct must be reported at the earliestop portunity to the designated individu al in authority.

12. BEFOR E -O PERATION SERVICE .

a. This inspection schedule is designed primarily as a check tosee th at the vehicle has not bee n damaged , tampered with, or sabotaged

si nce the After-operation Service was perfo rmed. Various combat conditions ma y have rendered the vehicle un safe for oper ation and it isthe duty of the drive r to determine whether or not the v ehicl e is in conditi on to carry o ut any missio n to which it is assign ed. This operationwill not be entirely omitt ed, even in extr eme tactical situation s.

b. Pr ocedures. Befor e-operation Service consists of ins pectingitems listed be low ac cording to the pro cedure desc ribed, a nd correcting or reporting an y deficie ncies. Up on completion of the serv ice, resultsshould be reported promptly to the designated individu al in autho rity.

(1) IT EM ' 1, TAMPERI N G N D D AMAGE. Look for any injury to vehicle , its accessorie s, or equipment, caused by tamperin g or sabotage,collision, falling debris, or she ll fire since parking. Look in enginecompa rtment for evidenc e of above con ditions, and for loo sened ordamaged engine accessories or drive belts, loose fuel, oil or coolantlines, or disconnec ted cont rol linkage.

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(2 ) ITEM 2 , FIRE E X T I N G U I S H ER. See that exting uisher is secu relymounted an d not damaged . Look for evide nce of opened op e rating

v alve or leakage. 3) ITEM 3, FUEL, E N G I N E OIL, A N D C O OL A N T S U P P LY . Check amo unt of fuel in tank. C heck crankcase oil level on dip stick. Ch eckcoolant level. Add fuel nece ssary to comple te mission or to op e rateveh icle to next sch eduled fueling point. Add en gine oil and coo lantas needed to bring to cor rect level. NO TE: An y appreciable dro p inleve ls since After-ope ration Service sho uld be investigate d and causecorrected or r epo rted to designa ted a uthority. Du ring freezingwea th erwhen antifreeze solutio n is in use, if any appre ciable addit ion of water

is n eeded, ant ifreeze value sho uld b e tested by second echelon a ndadd ed if necessar y. Be sure spare fuel, oil, and water cans are full and securely mounted.

4) IT EM 4, A CCE S SORIES A N D D RIV ES . Examine unit s such ascarbu retor, generator, cranking motor, air compressor, fan, and aircleaners for looseness, damage or leaks. Be sure dr ive belts are in goodcondi tion and that adju stment is satisfacto ry. Belts should hav e V 2 to3/4-inch fi nger-p ressure deflection.

5) ITEM 5, A I R B R A K E TAN K S. Che ck the air b rake reserv oir

tanks to see that they a re secure and u nd amaged, and that all air lin econnec tions ar e tight. Also be sur e that w ater (condensatio n) h asb een d rain ed from the ta nks and that drain cocks are closed.

6 ) IT E M 6, L E A K S, G EN E R A L . Inspe ct grou nd and also u nder thevehicle and w it hin engine comp artm ent fo r indica tions of fuel, engineoil, co olant, and gear oil leaks. Pay part icular a ttention to fuel ta nksand lines, crankcase a nd oil filters, radi ator, water pump , water lin esand connections, and all gear cases. Trace any leaks found to th eirsource, and correct or repor t them to des ignated authority.

7) ITEM 7 , E N GINE W AR M-U P. S tart engine and n ote any tendenc y towar d hard starting . Observe action of cranking motor, particul a rly if it has ad eq uate cranking spee d a nd engag es an d disengag eswi thout unusua l noise when in opera tion . Set hand th rottle so thatengine idles at 450 to 600 revolutions per m inute, and d uring warm- up,proceed with following Before-ope rat ion Services. N OTE: oil pressure is n ot evident in 30 seconds stop engine and inves tigate.

8 ) IT EM 8, CH O K E . As engine is bein g started, chec k op erationof choke. As engine w arms up, reset choke as re quired for engine torun smo o thly and to pre v ent overc hoking and oil dil ution.

9) IT EM 9, I N S T R UME N T S . a ) Oil Gage. Pres sure a t normal en gine operating spe ed must be

30 to 5 0 pounds, and the minim um at idling spe ed m ust be 5 pounds. b) Amm eters. Regular am me ter should show p ositive ( -j- ) ch arge

with engine at fast idle, and at slower sp eeds with lights on may show

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on negative ) side. B ammeter indicates that second battery orB battery is charging or discharging. High charge readings may be

indicated until generator restores to batteries current used in startingengine.

c) Engine Temperature Gage. Reading should increase graduallyduring warm-up period to normal operating range 157 F. to 183 F.Maximum safe temperature is 200 F. NOTE: Do not move vehicleuntil temperature reaches minimum operating range of 135 F.

d) Viscometer. After engine has reached operating temperature,reading should be in ideal range.

e) Tachometer. White pointer should indicate actual enginerevolutions per minute at any given time engine is running. Read handindicates, and remains at highest engine revolutions per minute reached.It should not exceed 2,400 revolutions per minute.

f) Air Pressure Gage. Gage should register 60 pounds beforemoving vehicle. Maximum governed pressure is 105 pounds.

g) Fuel Gage. Inspect gage to see that it registers the approximateamount of fuel in tank. Ordinarily tank will be filled after operationand gage should register FULL.

(10) ITEM 10, HORNA N D W IN D SH IELDWIPERS. If tactical situation permits, test horn for proper operation and tone. Test wipers tosee that they operate, and observe whether the blades contact glassevenly and arms travel through full stroke. Inspect for damage.

(11) ITEM 11, GLASSA N D REAR VISIONMIRROR. Clean all glassand inspect for damage. Air rear vision mirror properly and see that itis secure.

(12) ITEM 12, LAMPS ( L I GHTS )A N D REFLECTORS. See that alllights and warning reflectors are clean. Examine them for looseness or

damage. If tactical situation permits, open and close switches, andobserve if lights respond properly. Include stop and blackout lights.

(13) ITEM 13, W H E E L AND FLANGE NUTS. See that all wheelmounting and axle flange nuts are present and secure.

(14) ITEM 14, TIRES. Maximum tire pressure should be 65 pounds(cool). Inspect tires for damage, and remove any embedded objectsfrom treads, carcass, or between duals.

(15) ITEM 15, SPRINGSA N D SUSPENSIONS. Inspect springs andshock absorbers to see that they are secure and not damaged, and thatall assembly and mounting nuts and screws are tight. Examine shockabsorbers for leaks.

(16) ITEM 16, STEERINGLINKAGE. Inspect gear case and all rodsand friction points for looseness, damage, or excessive lubricant leaks.

(17) ITEM 17, FENDERS AND BUMPERS. Inspect fenders andbumpers for looseness or damage.

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(18) I T E M 18, T O W I N GC O N N E CTIONS. Inspe ct all connectionsfor looseness or damage. Examine pintl e to be sur e it opera tes freely

and locks securely. See that fifth wheel is secure and not dam aged, thatlever and kingpin con nection works properl y, and that it will locksecurely.

(19) ITEM 19, BODY N D TARPAULIN. Insp ect cab and top tarpaulin for dama g e. See that doors and lat ches ope rate properly, and thatfloor plate s and engine cover are secure.

(20) IT EM 20, DECONTAMINATOR. Be sure decontaminator ispres ent, fully charged, and secure.

(21) I T E M 21, TO O L S A N D E QUI PME NT. Be sure all items arepresent, serviceable, and prope rly mounted or stowed.

(22) ITE M 22, E N G I N EO PERATION. Befor e vehic le is put in motion, be sure engine has reached operating temperature and idlessmoothly. Accelera te and decelerate an d listen for any unusual vibration or noise. No te any unsat isfa ctory operating cha racteristics or excessive exhaust smoke.

(23) ITEM 23, DRIVER'SPER M I T A N D F O R M No. 26. Driver m usthave his operator 's permit on his person. Ch eck to see that Standard

F or m No. 26 Driver's Report-Accident , otor Transportation, Operato r's Manual, Lubric ation Guide, and W.D. , AGO Form N o. 478 arep resent in vehicle , legible, and prope rly stowed.

(24) I T E M 25, DURING-OPERATION CHEC K.The During-opera tio nServices and observations st art immedia tely as the vehicle is put inmotion. Detail ed description follows.

13. DURING-OPERATION SERVICE.

a. While vehic le is in motion, list en for any such sou nds as ra ttles,knocks, squeals, or hum s that may indicate trouble. Look for in dication s of trouble i n cooling system and smoke from any p art of thevehicle. Be on the alert to detect any odor of o verheated componentsor units such as ge nerator, brake s, or clutch, fuel v apor from a lea k in fuel system, exhaust gas, or other signs of trouble. Each time thebrakes are used, gears shifte d, or vehicle turned, consider this a testan d notice any unsatisfactory or un usual performance. Watch theinstruments constantly. Notice promptly an y unusual instr ument indications th at may si gnify possible trouble in the system to which theinstrument applies ,

I . P rocedures. Durin g- operation Services c onsist of obse rvin gitems listed bel ow accordin g to the procedures fo llowing the instructio ns in each it em, and investigating a ny indications of serious trou ble.Notice minor deficienc ies to be co rrected or reported at earliest oppo rtunity, usually next scheduled h alt.

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(1) I T E M 27, F O O TAND HAND BRAKES. Foot brak es should stopvehicle smoothly a nd effectively with normal pedal pre ssure, and return

to off position imm ediately after foot pressure is rele ased. If towedv ehicle is co nnected, test han d-operated air ap plication valve sep arately, and note if brake action on tra iler is satisfactory. Hand br akeshould hold v ehicle on a reason abl e in cline, leaving one-h alf ratch ettravel in reserve, and should lock securely in applied po sition.

(2) IT EM 28, C LUTCH. Clutch should not grab, chatter, or squeal during engagement , or slip when fully engaged under load. Pedal should have a 11/2-inch f ree tra vel bef ore meeting resistance .

(3) I T E M 29, TRANSMISSIONS. Gears shou ld shift sm oothly andquietly, and not creep ou t of mesh during operation.

(4 ) I T E M 30, TRANSFER. Transfer unit range gears and de clutching mechanism should sh ift easily and quietly and not cree p ou t ofm esh during op eration.

(5) I T E M 31, E N G I N EAND CONTROLS.Th e driver must b e on thealert for deficie ncies in engine performance, such as lack of usualpower, m isfiring or stalling, unusual noise or vibration, and any indications of overhea ting or excessive exhaust smoke. Observe if e nginerespo nds to all controls and if the con trols are in proper adjustment,and not excessiv ely loose or binding.

(6) I T E M 32, INSTRUMENTS. Obs erve readings of all instru mentsfrequently during operation to be sure units to which they app ly arefuncti oning satisfactorily.

a) Oil Pressure Gage. Ga ge should show normal operating pressure, 5 pounds min imum at idli ng, and 30 to 50 poun ds at operatingvehicle speeds.

b) Am meters. During oper ation, with all lights and accessori esturn ed off, the main ammeter sho uld indicate a positive +) charge a toperati ng spe ed or with fully charged batte ries, and regula tor unitcut-in ma y register zero. B ammeter shou ld also show positive +)or zero charge. Inve stigate or report excessive negative -) readingsto proper authority.

c) Engine Temperature Gage. Gage should read 15 7 F. to 183 F.in normal op erating range. Max imu m safe tempe rature is 200 F.

d ) Vi scometer. Du ring operation, v isco meter pointer should remain in ideal range. Thin rang e reading may indicate oil dilu tion .Heavy range reading m ay indicate oil contamination, such as presenceof dirt or slu dge. Abnormal read ings should b e in vestigated or re ported to proper authority.

e) Air Pressure Gage. Maxim um read ing should be 105 pounds, minimum 60 pounds.

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f) Tachometer. Wh ite pointer sho uld register actual engine re volutions p er minu te, and red pointer should no t exceed maximum gov

e rned speed, 240 0 revolutions per minute. g) Speedometer. P ointer should ind icate actual ve hicle speed,

and odomete r should register total acc umulated mileag e.

h) Fuel Gage Fuel gage should co ntinue to register appr oximateamo unt of fue l in tank.

7) I T E M 33, STEERINGG E A R. Note any ind ication of loosenessor bind ing, pullin g to one side, wandering , shimmy, whee l tram p, orunusual noise.

8) I T E M 34, R U N N I N GGEAR. Be on the alert for an y unusual operating characteristics or noise from whee ls, axles, or su spensionun its that mi ght indicate looseness or damage, or under-infla ted tires.

9) I T E M 35, BODY. Note any noise or abnormal condition thatmight indicate shifting, lo o se top tarpaulin or curtains, loose o r damaged doors, hardwa re, floor or inspection plates, or mo unted body attac hments.

14. AT-HALT SERVI C E

a. At-halt Services may be regarded as min im um maintenance procedures and shou ld be performed unde r all tac tical co nditions eventhou gh more extensive maintenance serv ices must be slighted or omitted altoge ther.

b. Proced ures. At-halt Services consist of investigating anydefici encies noted during operation, inspe cting items listed below ccording to the procedures followi ng the item s, and correcting a nydeficiencie s found. Deficiencie s not corrected should be repor tedpromp tly to the designated individual in auth ority.

1) I T E M 38, FUE L , OIL, A N D WATER SU PPLY. C heck the fuelsupply to see that it is a dequate to operate the vehicle to the nextrefueling point. When refueling, use safety p recautions for groundingst atic electricity , and allow space for expansion in filler neck. Fillercap vents must be open, pressure cap valves must be free, and capsmust be replaced securely. Check the cra nkcase oil level and, if n ecessary, add oil to proper level. Remove radiator filler cap being carefulof steam, especially if a pressur e cap is used. Chec k coolant to see thatit is at prop er level, and replenish as necessary. Do not fill to ove r

flowing b ut leave su fficient space for expansion. If eng ine is hot, fillslowly while engin e is running at a fast idle. 2) I T E M39, T E M P E R AT U R E S :HUBS, B R A K ED R U M S ,T R A N S F E R ,

T R A N S M I S SION,A N D AXLES. Place han d cautiousl y on ea ch brake drumand wheel hub to see if it is abnorma lly hot. Inspect transfer case,transmiss ion, and axle housings for overheati ng, and note any excessive lubri cant leaks.

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4 TO 5 TO N x TR CTOR TRU C K A UTOCAR MODEL U-7144T)

3) I T E M 40, AXL E A N D T R ANSFE RVE NT S. Wipe clean and inspect v ents for damage or clogging. Ve nts mus t be kept open.

4) I T E M 41, P ROPELLER S H A FTS. Inspect all dr ive shafts anduni versal jo ints for looseness damage and excessive lubricant leaks.Remove any foreign matt er wound aroun d shafts or joints.

5) ITEM 42, SPRINGSA N D SU SPENSIONS. Inspect for broken orshifte d spring leaves damaged or loose U-bolts eye bolts shacklesre boun d clips or shock absorber bodies and linkage or 'excessive shockfluid leaks.

6) I T E M 43, STEERING LINKAGE. Examine all ste ering controlmechanism arms and linkage frictional joints fo r looseness or damage.Investigate any unusual condition note d dur ing operatio n.

7) I T E M 44, W H E E L A N D FLAN G E N U T S. See that all wheelmounti ng and axle flange nuts are pre sent and secure.

8) I T E M45, TIRES. Ins pect all tires for under-inflation or da mage. Remove embe dded objects in treads or carc asses and from between duals. See that spare tire is inflated and secure in carrier.

9) ITEM 46, LEAKS,G ENERAL. Look u nder vehicle and withinengine compartm ent for indicatio ns of fuel, oil, or coolant leaks. Trace any leaks fo und to their source and corr ect or re port them to properauthority.

10) IT EM 47, ACCESSORIESA N D BELTS. Ex amine all accessibleunits for looseness or d amage. Be sure genera tor fan and compress ordrive belt tension is satisfactory.

11) I T E M48, A IR CLEANER.If operating un der extre mely dus tyor sandy conditions inspect air c leaner a nd breather cap to see thatthey ar e in condition to deliver cle an ai r properly. Service as neces sary .

12) I T E M 49, FENDERSA N D B U M PER. Inspect front bumperfenders and rear splash gu ards for looseness or damage.

13) ITE M 50, TOWI NG CONNECTIONS.Inspect all connec tions forlooseness or damage . Be sure locking devices ar e secure and thattrailer brak e air hose is supported so as not to chafe on other vehicleparts .

14) I T E M51, BODYA ND TAR PAUL IN . In spect fo r dam age or a nyindications of looseness or shifting of cab.

15) I T E M 52, G LASS. Clean win dshield mirror light and warning reflector glass, and ins pect for damage.

15. A FTER OPERATION N D W EEKLY SERVIC E.

a. A fter-operation Service is particu larly important b ecause at thistime the drive r inspects his vehicle to detect any deficiencies that may have de veloped and corre cts those he is permitted to hand le. He should

rep ort promptly to the des ignated individu al in author ity the results30


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of his inspection. If this schedule is pe rformed thorough ly, the vehicleshould be ready to roll again on a moment's notice. The Befo re-opera -

tion Ser vice , with a few exc eptions, is necess ary only to ascertainwhether the v ehicle is in the sa me condition in w hic h it was left uponcompletion of the After-op eration Service. The After-op eration Service should ne ver be entirel y omitted even in extreme tactical situations, but may be reduced to the bare fundamental se rvices outlined forthe At-halt Service if necessary .

b Procedures. When performing th e After-ope ration Service,the drive r must remember and consider any irregularities notic ed during the da y in the Before-operation, During-o peration, and At-h alt Ser

vices. The After-operat ion Service consists of inspecting and servicingthe followin g items. Those items of the After -operation service thatare marked b y an aste risk (* ) require additiona l weekly services, theprocedures for wh ich are indicated in subparagrap h b) of ea ch applicable item.

1) I T E M 55, E N G I N E OPERATION. Test engine for sat isfactoryperformanc e and sm ooth id le. Accelerate and deceler ate engi ne, andnote any tendency to miss or backfire. Listen for a ny unusual n o ise orvibrati on that may indicate worn or ina dequately lubricat ed parts,

loose m ountings, inc'orrect fuel mixture , or faulty ignition. Note anyunusual exhaust smok e. Investiga te and correct, or rep ort any deficiencies noted during o peration to the proper authority.

2) I T E M 56, INS T R U M E N T S .Check all pe rtinent instruments tob e sure all are operati ng properly and continue to registe r or indicateco rrect perfo rmance of the units to whi ch they apply. Stop engine, firstallo wing it to cool off fo r 4 to 5 minutes if it is at or beyo nd normaltemperature.

3) IT E M54, FUE L ,OIL,A N D W ATER SU PPLY.Fill fuel tanks. See

if fuel gage ind icates full.) Check cra nkcase oil, and add as necessaryto b ring to correc t level. Check coolan t level, and add as necessary tobring to correct level. NO TE : Do not overfi ll fuel tanks or radi ator.Allow room for expansion. In freez ing weather , if any apprecia bleamount of coola nt is necessary, h ave antifreeze value checked, and a ddenough to protect coolin g system against freezing. Do not a dd coola ntwhile engin e is too hot. F ill all sp are fuel, oil, a nd water can s if supplyhas been used .

4) I T E M57, H O R N A N D WIN D SH IELDWIPERS.Inspect these items

to see if they are secure an d not.damaged. If tactical conditio ns permit,test horn for proper opera tion and tone .(5 ) ITE M 58, G L A S SA N D RE A R VISIONM IRROR. Clean and inspect

for damage, and be sure that mountings are secure. 6) I T E M 59, L A M P S L I G H T S ) A N D R EFLEC TO R S. Ins pect for

lo oseness or dam age. If tactic al situ ation permits, test all lights andsw itches for pro per operation. Clean all lenses.

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(7) ITEM 60, FIREEXTINGUISHER.Inspec t extinguisher for looseness or damage and full charge. If e xtinguisher ha s been in use orvalves opened, report for refill or exchange.

(8) ITEM 61, DECONTAMINATOR Inspect decontaminator forlooseness or da mage and full charge. If used, re p ort for refill or exchange.

(9) ITEM62. ^ B A T T E R I E S . a) Inspect batteries to see that they are clean, secure, and not

leaking or dam aged. See that cell caps are nnger tight. b) Weekly. C lean dirt from to p of batteries. If terminal con

n ections or posts are corroded , c lean them thoroughly and apply fresh,thin coating of grease. Tighten terminal bolts if loose. Remove vent caps and ch eck level of electroly te. A dd wa ter if required, takingprecaut ion s so that ba ttery will not be damag ed during freezing temperatures. Battery should be secure, not bu lging or cracked, or leaking elect rolyte; battery carrier should be secure, clean, free of rust,and well painted. If mounti ngs are loose, tighten th em cautiouslyso as not to damag e the battery case. Repo rt any d efe cts to properaut ho rity.

(10) ITEM 63, ACCESSORIESA N D BELTS. Inspec t units such ascarbure tor, gene rator, crank ing motor, fan, water pump, com pressor,distributor, regulator uni t, an d oil filters, for looseness, dam ag e, orleaks. Check con dition and adjustment of drive belt s. Belts shouldh ave l/z- to 3/4-inch finger- pressure deflection. Inv estigate and correct,or report to the prope r authority any deficiencies of accessory unitsor drives noted during operation.

(11 ) I T E M 64. ELECTRICAL WIRING. Inspect all ignition wiring

for looseness or damage, wipe off excessive grease or m oisture. Alsomak e an inspection of all accessible low voltage wiring and connection s for loosen ess or damage. Be sure all wiring is supported, so asnot to chafe against other vehicle parts.

(12) ITEM 65 . *AIR CLEANERA N D BREATHERCAPS. a) Inspect for loos eness or da mage. E xamine oil in reservoirs

for correct level and excessive d irt. Whe n operating in sandy o rdusty conditions, clean and serv ice air clean er and breather cap asoften as necessary.

b) Weekl y. Remove air cleaner and brea ther reservoirs andelements. W ash in dry-cleaning solve nt, refill reservoirs with cleanoil, and rein stall securely. Be sure all gaskets seal properly and thatjoints an d connections are secure.

(13) ITEM 66. *FUEL FILTER. a) Inspect filte r for looseness, damage, and fuel le aks.

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b) Wee kly. Remove se diment bowl drai n plug and drain offall ac cumulated dirt a nd wat er. If drai ning of fuel pum p sediment

bowl shows exc essive d irt o r w ater, remove and clean element in dry-cleaning so lvent.

14) IT E M 67. ENGINE C O N T ROLS. E xamine al l eng ine operating c ontrol linkage for looseness, damag e, excessive wear , and adequate lubricatio n .

(15 ) I T E M 68. TIRE S . a ) Examin e all tires, includ ing spar es, for dam age a nd excessiv e

wear. R emove all embe dde d foreign matt er, such as nails , glass, orstones, f rom treads and carcas ses and from betw een duals. Chec k forlow pressures, prope r po sition of valv e stem, and presen ce of valvecaps. In flat e to co rrect pr essure as needed; maximum is 65 pounds,cool.

b) Weekl y. Replace badly worn or otherw ise uns erviceabletire s. Serviceable t ires which show ab normal wear should be reloc ated t o other whe els to even wear. Apparent m echa nical deficiencies causing such wea r should be repor ted for atten tion by hig herechelo n .

16) I T E M 69. S P R I N G SA ND

S U SP E N S I O N S . Inspect for loose n ess or damage, a bn ormal spring sag, shifted spring lea ves, and shocka bsorber lea kage. Investiga te any noise or un usual con dition n oteddurin g operation,

17) ITEM 70. STEERING L I NKA G E . Inspec t lin kage for looseness or dam ag e. Examine st e ering gear case a nd friction al joint s forexc es sive lubricant lea kage or lack of lubrication. In ve stigate anyunusual operati ng condit ion note d during oper atio n.

18) ITEM 71. PROPELLER S H AFTS. Inspect al l drive shafts a nduniv ersal joints for l oo seness or damage and excessive oi l leaks. Re mov e any forei gn material woun d around sha fts or joints.

(19) ITEM 72. A XLE A N D T R A N S F ER V E NT S . a) M a ke sure that al l ax le h ousing an d transfer case v e nts a re

present, in good condition , and clean. Inspe ct for indicatio ns of lub ric ant leak age from vents.

b) W eekly. Remove vents, clean out passages, an d reinstallsec urely .

20) I T E M 73.L E A K S , G E N E R AL. Loo k in engin e compa rtment

and un der veh icle for indica tions of fuel, engi ne oil, co olant, or gearoil leaks.

21) IT E M 74. GEAR OIL LE VELS. Ch eck gea r oil level s in differenti al s, trans fer case, tr ansmission, a nd steering gear hou sing, andrepo rt to p roper au thority if low. C o rrect levels are f rom lower edgeo f filler ho le to on e -half inc h below when cool.

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4 - TO 5-T ON x T R A C TO R T R U C K AUTOCAR MODEL U-71 44T

(22) ITEM 75. *AiR B R A KE T A N K S .(a) Insp ect tanks and lin es for loose nes s or dam a ge. Open res er

v o ir d rain coc ks and drai n off all acc umu lated c ondensa tion . b) Weekly. T ig hten tank mounti ngs and line co n nections. C lean

air lin e rub ber hose of a ll grease or oil.(23 ) IT E M 7 6 FE NDE RS AND BU MPERS. Ins p ect front fe nder s,

bu m per, a nd rear spla sh g u ards fo r lo oseness or d amage .(24) ITEM 77. *TOWING C O N N E C TI ON S .(a) Inspect towi ng h ooks, tr uck trac tor fifth wheel (if used ), or

pintle ho ok, a nd s afety chains for loosene ss, exc essive wear, o r da mage. b ) Weekly . Lower t railer landi ng gea r, if connecte d, and un

h itch trailer. Clean con ta cting surf ace s of fifth wheel plat e a nd kingpi n la tch mechan ism . Inspe ct them for wear a nd d amage , and appl ya fresh c o ating o f cle a n grease. Rehitch the trailer, no ticing wheth e rthe ha n d lever wo rks e asily. Also note wheth er th e la tching m echanism close s com plete ly and latch e s securely .

(25) I T E M 78 BO D Y AND T ARPAULIN. Inspect c ab c arefully ford a mage or lo o se parts. Ex amine to p tarpaulin and side c urtain s forw orn sp ots or other dama ge, and see that the y ar e secure.

(26) IT E M82. T I G H T EN I NG .(a ) Tighten a ny moun ti ng or ext erna l assem bly nu ts or screws

if necess a ry. b) Week ly. Tighte n w heel mo unting and axle flange nuts and

cap screw, spri ng U- bolts, eye bolt s, shac kles and rebo und cli p s. Alsotighten uni vers al jo int co mpanion flanges, eng in e m ounti ngs, transfe rcase mou ntings , steering a rms, towi ng connecti on s, or an y other mounting or assemb ly nu ts or screws if ne c essary.

(27 ) ITEM83. L U B R I CA T E A S N E ED E D.

(a) Lu bricate all items, such as shackle s, hi nges, latc hes, con tro l linkage fric tio nal joint s, or any p oint where inspe ction h as ind icated oil can or h and greasing is needed.

b) Weekly. Lubricate all p oints o f the v ehicl e indi cated on theLubrica tio n Guide if it is necessa ry.

(28) ITEM 84. C L E AN ENGINEA N D VEHICLE. a) Clean dirt a nd grease o r oil drip pi ngs from in side cab, fr om

en gine comp artmen t, an d exterior of engine. Wipe off excess dirtand gr eas e from ent ire veh icle.

b) Weekly. Wash vehic le when po ssib le. If n ot possib le, wi peoff th or oughly. In spect p aint or camou fl age pattern for rust o r for bright spo ts wh ich mi g ht cause light re flect ions. Mak e sure that vehic le marking s are legib le unless covered for tactical re asons.CAU TION: If veh icle is d riven into water for w ashing, be carefulthat w ater or di rt does not ge t in to w heel b earin gs, gear ca ses orbra kes, or on electrical u nits or wiri ng .

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(29) ITEM 85. *TOOLS N D EQUIPMENT. a ) Check veh ic le stowa ge and tool lists to see tha t all items are

p resent. Inspe ct ite ms to see that they are in good c ondition andprope rly moun ted or stowed.

b) Weekly. Clean al l tools and equipme nt of rust or d irt, andapply pre servative where n ecessary w hen possible . See that toolswit h cuttin g edg es are sha rp and properly protec ted. Make surethat all items ar e securely mounte d or stowed. NOTE: Whenservice s are completed be sure all ins pection plates are rep lacedsecurely .

Section VI

LUBR IC ATION

16 . LUBRICATIO N GUIDE

a. War Department Lu brication Guide N o. 502 figs. 5 and 6)prescribes lu brication maintena nce for 4- to 5-to n 4x4 Tractor Truck

Auto car Model U-7144 T). The Guid e is sup plemented in thismanu al with lo cali zed views of important lubrica tion points figs. 7,8, and 9).

b. A L ubrication Gui de is placed on or is issued with eac h vehicleand is to be carried with it at all time s. In the event the v ehicle isreceived w ithout a guide, th e using arm s shall imm ediately req uisitiona replacement from the Com manding O fficer, Fort Wayne Ord nanceDepot, Detroit 32, Michigan.

c. Lu bricati on instruct ions on the Guide are b inding on all echelons of maintenance, a nd there shal l be no deviations from theseinstru ctions.

d. Service intervals spe cified on the Guide are for normal op eration conditions. Reduce th ese intervals under extreme con ditionssuch as excessively high or low temper atures, prolonged perio ds ofhigh speed, continued operatio n in sand or dust, im mersion in w ater,or exposure to moisture, any o ne of which m ay quickly destroy thep rotective qualities of the lubricant and requ ire serv icing in order toprevent malfunctioning or d amage to th e materiel.

e. Lubricants are prescribed in the Key in acco rdance with thre etemper ature ranges; above +32 F., +32 F . to 0 F., and b elow 0 F.Determine th e time to cha nge g rades of lubrica nts by maintaining ac lose check on operation of the vehicle during the approach to changeover p eriods. Be particularly o bservant w hen starting the engine. Sluggish s tarting is an indication of thickene d lubricants and the signal

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TRUCK TRACTOR 45TO

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LUBRICATION

TM 9 81 6

4

37


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LUBRICATON GUIDE

TRUCK,TRACTOR,45TON

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T 9 8 1 6

TJ

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to chan ge to gra des prescribed for the n ext lower temperature range.Ordinarily it will be necessary to change grades of lubricants only

when air temperatures a re co nsistently in the next higher or lowerrange unless malfun ctionin g occurs sooner due to lubricants b eing toothin or too heavy.

17. DETAILED LUBRICATION INSTRUCTIONS.

a. L ubrication Equipment. Each pie ce of materiel is suppliedwith lubrication equipm ent adequate to maintain the ma terie l. Besur e to clean this equip ment both before and after use. Operatelubricating guns carefully and in suc h manner as to insure a properdistrib ution of the lubricant.

b. Points of Applicati on.

(1) R ed circles sur rounding lubrication fittings, grease cups, oil ers, and o il holes make them readily identifiabl e on the vehicle. Wipeclean such lubricators and the surrounding surface before lubricantis applie d.

(2) Whe re relief valve s are provided, apply new lub ricant un tilthe old lubricant is forced from the vent. Exceptions are specified

in notes on the Lubrication Guid e.c. Lu brication N otes o n Individual Units and Pa rts. The fol

lowing instructions su pplement those notes on the Lubric ation Guidew hich pertain to lubrication and serv ice of individual units and parts.All note references on the Guide itself are to the subparagr ap h belowhavi n g th e sam e number.

(1) FITTINGS. Clean all fittings befor e ap plying lubricant. Lubricate u ntil new lubricant is forced from bearing, u nless otherw ise specified. CAUTION: Lubricate chas sis points after washing truck and trailer.

(2) INTERVALS. Intervals ind icated are for normal service. Fo rextreme conditions of speed, hea t, w ater, sand, mud, snow, rough roads, dust, etc., reduc e interval by V s or Yz or more if conditionswarrant.

(3) CLEANING. SOLV ENT, dry-cleaning, or OIL, fuel, D iesel,will be used to clean or wash a ll parts. Use of gasoline for th is p urpose is prohibited. All parts wi ll be thoroughly dry before lubricatin g.

(4) AIR CLEANERS. Daily, check level and refill oil reservoir ofengine air cleaner to be ad level with used crankcase oil o r OIL, engine, SAE 30, above +32 F. or SAE 10 +32F. to 0F. Use OIL, hydraulic, from 0F. to -40F. Below -40F., rem ove oi l and operatedry. Every 1,000 miles, or d aily, under extreme d ust co nditions, remove an d wash all parts. T he air cleaner oil reserv oirs of so memodels have NOR MAL and CAUTION oil level m arks. When re-

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TM 9-8167

LUBRICATION

DR AIN PLUGS

CLUTCH

D RE AR END OF GENERATOR

CLUTCH R E L E A S E BEARING

FA N TRANSMISSIO N

G CLUTCH AND BRAKE PEDAL S, WATER PUMP,AND TACH OM ETER DRIVE

RA PD 77926

Figure 7 E ng ine, Clu tch and Trans m i s s io n lobrieaf ion Poin ts

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4 - TO 5 -T O N x TRACTOR TR UCK AU TOCAR MODEL U-7144T)

A IN SIDE O F FRONT WHEEL

FR ONT SPR ING PIN AN D D RAGLIN K-F R O N T END

REAR S P RING S HA CKLE

D FRONT SPRING SHA CK LE

FRONT A XLE H OU S ING

O U TSIDE OF FRONT WHEEL

FR ONT OF REA R S P RING

R A PD 779 33

Fi g ur e 8 Wh ee ls A x le s a n d Sp rin g s L ubr ica t ion P o int s


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LUBRICATION

E TRANSFER CASE CONTROL B R AC KETAND L E V E R S

B INTERMEDIATEP R O P E L L E R SHAFT U N IV ERS A LJOINT

C P R O P E L L E R SHAFT B R AKE PINTLE HOOK

REAR EN D OF DR A G LINK

Figure 9 M/sce//oneous Lubr ica tion Po in t s

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4 TO 5-TON x TRACTOR TRU CK A U T O CAR MO DEL U-7144T

fil ling the rese rvoir , fill to the NORMA L leve l mark; the CAUT ION le vel mark w ill not be rea ched by th e oil if th e ai r cleane r is servi ced as

desc ribe d. Ever y 1,000 miles, or weekly o n som e mod els, remove topof crankcas e breathe r and wash. Clean and refil l o l rese rv oir to bea dle vel with use d c rankcase oil o r O IL, engine, SAE 30, above +32 F. to0 F. U se O IL, hydrauli c, fro m 0F . to -40 F. Below- 40 F. remove oil and op erate dry . Every 6, 000 mil es o n some mod els, rem ove an dw a sh crankc as e fill ca p an d breath er. Every 1,000 miles, rem ove co mpress or air c lean er a nd wa sh all p arts. Wash cu rled h air, d ry , andsa turate wit h used cra nk case oil or OIL , engine , SAE 30, ab ove +32 F .o r SAE 10 +32F . to 0F. U se OIL, h y draulic, from 0F. to -4 0F.

Below -40 F., w ash and re place dry. Every 1,000 mi les, rem ovestra iner in gove rno r out let line of brak e gov ernor b y removin g pressure line a nd reta iner . Wash str ainer and reasse mble.

5 ) C R A N K CA SE. Drai n onl y whe n engine is h ot. T o aid in com plete drain ing, the fro nt en d of the tru ck sh ou ld be sl ightly high e rthan the rear. Refil l to FULL mark o n gage, or 4/ 4 level. T heo il level sho uld not be allowed to drop b elow th e 2/4 m ar k. Runeng ine a fe w minu tes a nd rec he ck oil lev e l. CA UT ION: Be surepre ssure gage indic ating o il is ci rculat ing

(6) OIL FILTER . Every 1,000 mile s, d rain se d iment E very6,000 m iles or mo re often if f ilter becom es clogged, drai n filter housings, c lean ins ide , and renew filter elem ents. Run engine a few min utes, che ck cran k case lev el, and a dd oil to FULL ma rk on gage.

( 7) GE AR C A SES (A and F, fig. 7; E, fig . 8; A, fig. 9). Week ly,chec k lev el with truck on le vel ground and, if nece ssary, add l ubrica ntto withiri l 2 in ch of plug level when cold , or to plug level w hen hot.D rain and refill at inte rvals indic a ted on gui de. Drain only after

operatio n. Keep ho using vents clea n. Tra nsmissio n h as S UMM ERand W IN TER level markings a t filler plug.

(8) UNIVERSA L JOINTS F R O N T WHEELS (A , fig. 8) . Wi thtru ck on leve l ground, re move plug on u nder sid e of join t; also rem ove plug in wh eel hu b and inst a ll fitting. Fill thro ug h fitting tole vel of plu g hole. Re move fittin g and re inst all pl ug.

(9 ) UNIVERSA L AND SLIP JOINTS B and F, fig. 9 ). ApplyGR EASE, gen eral pu rpos e, No. 1 ab ove ^32F . and No. 0 below

+3 2 F. to un iversal join t u ntil it ove rf lows at re lief valve, a nd to slipjoin t un til lubr ica nt is fo rce d from v ent at uni ve rsal joint end ofspline.

(1 0) B R A KE GOVERNOR . E very 6 ,00 0 mi les or 6 mon ths , remo vethe co ver plate from the b rake govern or, an d lub ricate the u ppervalve ste m w ith a fe w d rops of OIL, lubric ating , pr eser vative, spec ial.

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(11) CLUTCHPILOT BEARING. At time of disassembly of clutchfor inspection, replacement, or overhaul, clean and repack bearing

with GREASE, general purpose, No. 2.(12) DISTRIBUTOR.Every 6,000 miles, wipe distributor breaker

cam lightly with GREASE, general purpose, No. 1 above +32 F.and No. 0 below +32 F., and lubricate breaker arm pivot, wickunder rotor, and governor weight pivots and slots with one to twodrops of OIL, engine, SAE 30, above +32F. or SAE 10 +32F. to0F. Below 0F., use OIL, lubricating, preservative, special.

(13) T U R N TA B L E(FIFTH W H E E L ) . Some types of early modelshave two additional fittings. Keep the turntable, coupler pin locking jaws, and guides well lubricated with GREASE, general purpose,No. 1 above +32F. and No. 0 below +32F. If covered with gritand sand, clean and relubricate. Lubricate the kingpin lock withOIL, engine, SAE 30, above +32F. or SAE 10 +32F. to 0F. Below0F., use OIL, lubricating, pr

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TM 9-816 ( 4- to 5-Ton 4x4 Tractor Truck (Autocar Model U-7.pdf