320D-336D Excavator Intro

SERV1852-02August 2008

TECHNICAL PRESENTATION

320D -336D HYDRAULIC EXCAVATORS -TIER III ENGINES

INTRODUCTION

Service Training Meeting Guide(STMG)

GLOBAL SERVICE LEARNING

320D -336D HYDRAULIC EXCAVATORS -TIER III ENGINESINTRODUCTION ((320D - 336D)

AUDIENCELevel II - Service personnel who understand the principles of machine systems operation,diagnostic equipment, and procedures for testing and adjusting.

CONTENTThis presentation provides an introduction and machine walkaround for the 320D-336DHydraulic Excavator. Additional presentations will cover the engines, pilot system, pumps andcontrols, main control valve group, swing system, travel system, and tool control systems inmore detail. This presentation may be used for self-paced and self-directed training.

OBJECTIVESAfter learning the information in this presentation, the technician will be able to:

1. identify the major components and controls of a 320D-336D Hydraulic Excavator, and

2. perform a machine walkaround inspection and daily maintenance.

REFERENCES320D Hydraulic Excavator Specalog AEHQ5856323D L and 323D LN Hydraulic Excavators HEHH3327324D Hydraulic Excavator Specalog AEHQ5663325D Hydraulic Excavator Specalog AEHQ5665328D Hydraulic Excavator Specalog AEHQ5706330D Hydraulic Excavator Specalog AEHQ5667Machine Monitoring System - Systems Operation RENR8068Self-study "300D Series Hydraulic Excavators, 345C Hydraulic Excavator, and 365C & 385C Large Hydraulic Excavators SERV7032iTIM " '300C' Series Hydraulic Excavators-Electronic Control Systems" SERV2693iTIM "325C Hydraulic Excavators-Hydraulic Systems" SERV2701325D Hydraulic Schematic KENR6157

Estimated Time: 1 HourIllustrations: 41Form: SERV1852-02Date: August 2008

© 2008 Caterpillar

TABLE OF CONTENTS

INTRODUCTION ........................................................................................................................5

MACHINE WALK-AROUND...................................................................................................14325D Hydraulic Excavator ...................................................................................................16330D Hydraulic Excavator ...................................................................................................25

OPERATOR STATION ..............................................................................................................33

CONCLUSION...........................................................................................................................48

SERV1852-02 - 3 - Text Reference08/08 Introduction

PREREQUISITES"Fundamentals of Mobile Hydraulics Self Study Course" TEMV3002"Fundamentals of Power Train Self Study Course" TEMV3003"Fundamentals of Electrical Systems Self Study Course" TEMV3004"Fundamentals of Engines Self Study Course" TEMV3001

NOTES

Nomenclature Change: During the fourth quarter of 2008, the 325D and 330Dnomenclature changed. The 325D became the 329D and the 330D became the 336D formost arrangements.

The exceptions are as follows:

- The nomenclature for the 325D MH and 330D MH did not change.

- The nomenclature for the 325D FM and 330D FM did not change.

- The 325D HD HW did not change into 329D HD HW. This model is being discontinued.However, the 330D HD HW changed to the 336D HD HW.


INTRODUCTION

The Caterpillar 320D-336D range of Hydraulic Excavators incorporate design innovations andperformance improvements from the 300C Hydraulic Excavator Series and are a directreplacement for them.

The range comprises of: 320D, 321D, 323D, 324D, 325D, 328D, & 330D, with some modelshaving various additional machine arrangements. During the fourth quarter of of 2008, the329D replaced the 325D and the 336D replaced the 330D for most arrangements.

The machines feature a new cab for greater operator comfort. The cab provides the operatorwith excellent visibility of processing equipment, trucks, and railcars. The cab, consoles, andjoysticks have been improved to provide a better access and understanding of all functions.

This presentation discusses the systems operation of the 320D-336D Hydraulic Excavators,along with basic engine and machine component location.

NOTE: Most of the illustrations of the iron in this presentation will be of the 325D and330D excavators. The other models will be configured similarly, but componentlocations may be different. Some of the illustrations may show pilot iron instead ofproduction iron.

The most significant differences will be related to the engine compartment due to thethree different engines being used in this series of machines as well as two of the modelsbeing compact radius (CR).

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320D-336D EXCAVATORS - TIER III ENGINESINTRODUCTION AND SYSTEMS OPERATION

(320D - 330D)

© 2008 Caterpillar

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The 320D-336D Hydraulic Excavators cover the 20 to 36 metric ton class of excavators and areextremely versatile machines capable of performing a wide range of tasks by utilizing thevarious work tools available. For the "D" Series models shown, they are all equipped withACERTTM Tier III engines.

NOTE: Some of the "D" Series excavators arrangements are built using Tier II enginesto better meet market needs in certain parts of the world.

The machines can be configured with a wide range of undercarriages including standard, long(L) and long and narrow width (LN).

For some models additional letters are included in the nomenclature, for example: forestmachine (FM), material handler (MH), heavy duty (HD), and waste handling (WH) to designatethe machine application.

The 321D and 328D are only available as compact radius (CR) machines.

As mentioned, during the fourth quarter of 2008, the 325D and 330D nomenclature changed tothe 329D and 336D respectively.

The reason for the change was to better align the machine nomenclature with the actualmachine weight. Making this change should lead to increased machine sales.

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The exceptions to this nomenclature change are as follows:

- The nomenclature for the 325D MH and 330D MH did not change.

- The nomenclature for the 325D FM and 330D FM also did not change.

- The 325D HD HW did not change into 329D HD HW. This model is being discontinued.However, the 330D HD HW changed to the 336D HD HW.


The 320D, 325D, and 330D can be configured as a material handler (MH). A fixed cab riser, oras shown here, a hydraulic cab riser is available.

The cab riser provides different operating heights with excellent visibility for loading andunloading processing equipment, trucks, and rail cars.

The 321D CR and 328D LCR are compact radius (CR) machines. With CR machines, themachine tailswing is within the width of the undercarriage (depending on track width).

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This chart displays some the similarities and differences between the 300D Series and the 300CSeries hydraulic excavators. New and improved features include:

Operator's Station: The layout of the interior has been redesigned to maximize operatorcomfort and reduce operator fatigue. Frequently used switches have been relocated for easieraccess.

The consoles and armrests have been redesigned for better comfort and adjustability. More seatoptions are available: the standard mechanical suspension seat, or the optional air suspensionseat with heater.

Engine: The "D" Series machines are equipped with Tier III ACERTTM engines. The C6.4engine is used in the 320D, 321D, and 323D. The C7 engine is used in the 324D, 325D/329D,and the 328D. The C9 engine is used in the 330D/336D.

Monitor: The monitor is a full color Liquid Crystal Display that provides vital operating andperformance information, which is all in a simple, easy to navigate format.

Tool Control: The tool control systems for the 300D are similar in function as the tool controlsystems for the 320C - 330C medium excavators, although the medium pressure circuit is nowa stand-alone function.

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The SmartBoom™ attachment enhances operation of the boom function and significantlyreduces cycle times of the machine. The SmartBoom™ is essentially a boom float attachment,which allows the operator to lower the boom under its own weight or for the boom to raise updue to stick force.

Service and maintenance intervals have been extended to reduce machine service time andincrease machine availability.

Options include the following:

The Machine Security System (MSS): This system uses a special Caterpillar key withan embedded electronic chip for controlling unauthorized machine operation.

Product Link: This option provides all kinds of information and working parametersthrough a satellite connection between an on-board computer and the machine. ProductLink provides easier fleet management and improved preventive maintenance. PL121and PL321 are both available.

AccuGrade: This option provides precise control of the work tool using specialsoftware.

Auxiliary Hydraulic Options: This option allows the machine to be configured to meetthe work tool needs, while increasing its versatility.

- Single Function Circuit is suited for tools that require one-way flow with one or bothpumps, such as hammers and vibratory plate compactors.

- Double Function Circuit is suited for tools that require two-way flow, utilizing one ortwo pump flows, such as thumbs, non-rotation grapples, or shears.


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For the most part the main implement hydraulic system operation for the 320D-336D is thesame as the 300C Series. The "D" Series continues using many of the "C "excavator features,such as automatic priorities and tool control systems.

The machines use a negative flow (NFC) hydraulic system. The main control valve group andpumps are similar to the "C" Series. Each of the models may have the components located indifferent locations due to the size of the machine or the type of carbody.

The 330D/336D is equipped with a new main hydraulic pump design and is the only modelequipped with a hydraulic demand fan system.

The smaller machines can be equipped with an optional visconic demand fan if needed forworking in areas with high ambient temperatures.


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The optional tool control system maximizes work tool productivity by configuring hydraulicflow, pressure, and operator controls to match a specific work tool. System versatility enables awide range of tools to be used.

The system stores pressure and flow information for up to ten tools. Selectable Cat tools havepreset flows and pressures.

The 300D excavators produced in Akashi and Aurora (for the North American CommercialDivision (NACD) can be equipped with the following factory installed tool control systems:

- System 3 (Hammer) - provides two pump flow in a single direction only. This systemalso includes a mechanical line relief valve for tools requiring lower pressure settings(single action).

- System 5 (Thumb) - provides one pump flow in both directions (extend/retract doubleaction) and can be controlled with a foot pedal or a joystick.

- System 14 (Multifunction) - provides one or two pump flow in one or two directions(single action or double action). System 14 has full electronic controls. An optional,independent medium pressure circuit is used for such applications as a rotating shear orditch cleaning bucket.

The System 14 functions are now controlled through the Machine ECM. A separate ToolControl ECM as was used on the 300C Series is not needed.

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The machines produced in Akashi and Gosselies for the EAME market will have the followingfactory installed optional tool control systems:

- System 16 - provides two pump flow in a single direction, has a direct return system tothe hydraulic tank, and includes a mechanical for tools requiring lower pressure settings(single action).

- System 17 (Multifunction) - provides one or two pump flow in one or two directions(single action or double action). System 17 has a direct return system to the hydraulictank, instead of the oil returning through the main control valve group. System 17 hasfull electronic controls.

An independent medium pressure circuit is available with System 17 to use forapplications such as a rotating shear or a ditch cleaning bucket.


MACHINE WALK-AROUND

The 300D Series track excavators have been designed for fast, easy service with extendedservice intervals, advanced filtration, convenient filter access, and user-friendly electronicdiagnostics for increased productivity and reduced maintenance costs.

The hydraulic system and component locations have been designed to provide a high level ofsystem efficiency. The main pumps, control valves, and hydraulic tank are located closetogether to allow for shorter tubes and lines between components which reduces friction lossand pressure drops in the lines. This design reduces engine compartment heat and sound beingtransmitted to the operator.

Components shown include:

- stick (1)

- boom (2)

- operator station (3)

- access door to air cleaner and battery compartment (4)

- engine access cover (5)

- access door to radiator compartment (6)

- counterweight (7)

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This illustration shows the major components and service areas on the machine.

NOTE: The 325D and 330D will be used on the following pages to show componentsand their locations on the 300D Series excavators. These locations may vary betweenthe other models.

The locations and components used on the 320D, 321D, 323D, 324D and 328D will bemore similar to the 325D/329D than the 330D/336D.


325D/329D Hydraulic Excavator

This illustration shows access to the top of the machine from the right side.

The engine access cover (1) allows access to the engine from the top of the machine.

The machine hydraulic oil tank (2) is located between the pump compartment and the dieselfuel tank on the right side of the machine and is accessed from the top of the machine.

The diesel fuel filler cap (3) is accessed from the top of the machine.

The storage compartment (4) is located in the front of the machine.

The step and hand rail (5) at the right front of the machine can be used for access to the top ofthe machine.

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The compartment behind the operator station includes the following components:

- Machine ECM (1)

- air conditioning condenser and receiver (2)

- master disconnect switch and circuit breakers (3)

- dual element, radial seal air filter (4)

- batteries (5)

- engine shutoff switch (6) (on machines with a cab riser)

The Machine ECM also includes software for the Tool Control System.

NOTE: The machine used in this illustration is equipped with a cab riser. On mostmachines a window washer solvent reservoir would be shown behind the masterdisconnect switch and circuit breakers.

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The radiator access compartment is located in front of the counterweight. The door is hingedon the right and has a locking latch on the left side to keep it closed. This door provides accessto assist in cleaning some of the cooling system components:

- Air to Air After Cooler (ATAAC) (1)

- manual cab lowering valve (2) (only for machines with cab risers)

- hydraulic oil cooler (3)

- fuel priming pump (4) (will be changed to electric priming pump)

- fuel filter (5)

- fuel sensors (6) (temperature and pressure)

- fuel water separator (7)

- engine coolant overflow bottle (8)

- radiator (located behind the water separator and coolant overflow bottle) (9)

- left compartment release lever (access to batteries and air filter) (10)

- joystick pattern change valve (not shown) is located on compartment floor


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The illustration shows the pump compartment on the right side of the machine. Thecompartment is accessed from the right side of the machine when the rear access door is open.

Some of the visible components are:

- engine oil filter (1)

- pilot pump (2)

- medium pressure circuit pump (3)

- drive pump (4)

- idler pump (5)

- pilot filter (6)

- case drain filter (7)

- hydraulic system return oil filter (8)

- pressure taps for auxiliary tool solenoids (9)

- solenoids for the medium pressure circuits (10)


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The 320D-336D pilot manifold is the same as the 300C Series pilot manifold. The pilotmanifold is accessible by removing the cover plate under the machine, behind the swingbearing. The manifold is located directly below the main control valve. Pilot manifoldcomponents visible are:

- two-speed travel solenoid (1)

- swing brake solenoid (2)

- hydraulic activation valve (3)

- hydraulic activation solenoid (4)


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The main control valve group is located in the center of the upper structure of the machine.The main control valve group receives pilot oil signals from the operator controls in the cab.Each pilot signal then causes the appropriate control valve to shift. When a control valve shifts,oil flows from the main hydraulic pumps to the appropriate hydraulic cylinder or hydraulicmotor to perform work. The 300D main control valve group is similar to the 300C maincontrol valve group. The valves are:

- right side NFC relief valve (1) - dual stage main relief valve (8)

- stick 2 (2) - left travel (9)

- boom 1 (3) - swing (10)

- bucket (4) - stick 1 (11)

- attachment (5) - boom 2 (12)

- right travel (6) - auxiliary valve for Tool Control (13)

- straight travel valve (7)


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The single 325D/329D swing motor (1) receives oil from the swing control valve. The swingcontrol valve receives hydraulic pump oil from the left pump. The swing drive oil level can bechecked with dipstick (2).

The travel motors (not shown) drive the outboard, planetary-type final drives (3).

A wide range of undercarriage (4) options are available to meet the needs of the machineapplication.

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The 325D/329D (324D and 328D also) is equipped with a C7 ACERT™ Engine (1).

Also visible are:

- the engine crankcase breather (2)

- engine oil level gage (3)

- S•O•S coolant sampling valve (4)

- engine oil fill cap (5)

- inlet air heater (6)

NOTE: The 320D, 321D, and 323D engine compartment will be slightly different dueto the use of the C6.4 engine.

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The engine cooling fan (arrow) on the 325D/329D is mechanically driven off the front of theengine.

An electrically controlled viscous clutch fan is available as an attachment to reduce fan noise onthe 320D - 329D. The optimum fan speed is calculated based on the target engine speed,coolant temperature, hydraulic oil temperature, and actual fan speed.

When fan speed is reduced, there is more engine horespower available for other functions andless fuel is burned.

NOTE: The 330D uses a hydraulic demand fan.

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330D/336D Hydraulic Excavator

This illustration shows access to the top of the machine from the right side.

The engine access cover (1) allows access to the engine from the top of the machine.

The hydraulic tank (2) is located between the pump compartment and the diesel fuel tank on theright side of the machine and is accessed from the top of the machine.

The diesel fuel filler cap (3) is accessed from the top of the machine.

A boom lowering check valve (4) (if equipped) is mounted on each boom cylinder.

The storage compartment (5) is located in the front of the machine.

The step and hand rail (6) at the right front of the machine can be used for access to the top ofthe machine.

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The air cleaner and battery compartment includes the following components:

- Machine ECM (1)

- air conditioning condenser and receiver (2)

- window washer solvent reservoir (3)

- master disconnect switch and circuit breakers (4)

- dual element, radial seal air filter (5)

- ether start aid solenoid (6)

- batteries (7)

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The radiator access compartment is located in front of the counterweight. The door is hingedon the right and has a locking latch on the left side to keep it closed. This door provides accessfor cleaning some of the cooling system components and servicing some of the fuel system andcooling system components. The following components are called out in the illustration above:

- hydraulic oil cooler (1)

- fuel pressure sensors (2)

- switch for electric fuel priming pump (3)

- electric fuel priming pump (4)

- fuel filter (5)

- Air to Air After Cooler (ATAAC) (6)

- radiator (7)

- engine coolant overflow bottle (8)

- fuel water separator (9)

A joystick pattern change valve if equipped (not shown) is located on this compartment.


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The illustration shows the pump compartment on the right side of the machine. Some of thevisible components are:

- quick coupler solenoid valve (1) - pilot pump (7)

- engine oil filter (2) - pilot filter (8)

- fan pump (3) - drive (right) pump (9)

- medium pressure circuit pump (4) - idler (left) pump (10)

- medium pressure solenoids (5) - case drain filter (11)

- pressure taps for auxiliary tool solenoids (6) - hydraulic system return oil filter (12)


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The main control valve group is located in the center of the upper structure of the machine.The main control valve group receives pilot oil signals from the operator controls in the cab.Each pilot signal then causes the appropriate control valve to shift.

When a control valve shifts, oil flows from the main hydraulic pumps to the appropriatehydraulic cylinder or hydraulic motor to perform work. The 330D/336D main control valvegroup is similar to the 330C main control valve group. The components shown include the:

- right side NFC relief valve (1) - dual stage main relief valve (8)

- stick 2 (2) - left travel (9)

- boom 1 (3) - swing (10)

- bucket (4) - stick 1 (11)

- attachment (5) - boom 2 (12)

- right travel (6) - auxiliary valve for tool control (13)

- straight travel valve (7)


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The single 330D/336D swing motor (1) receives oil from the swing control valve. The swingcontrol valve receives pump oil from the left pump. Additional swing motor componentsshown are:

- swing brake release pressure line (2)

- swing drive oil level dipstick (3)

- fine swing solenoid harness (4)

- swing crossover relief valves (5)

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The 330D/336D is equipped with a C9 ACERT™ Engine (1). The engine is rated at 200 kW(268 hp) at 1800 rpm. ACERT™ Technology offers better fuel economy and reduced wear.

Also visible in the photo are the:

- engine oil dipstick (2)

- inlet air heater (3)

- engine oil fill (4)

- S•O•S coolant sampling valve (5)

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The 330D/336D engine fan (1) is hydraulically driven by a fixed displacement motor (2). Thefan motor is supplied oil from the fan pump. Fan speed is varied to provide optimized cooling.The optimum fan speed is calculated using engine coolant temperature and hydraulic oiltemperature.

The direction of the engine fan can be reversed on machines equipped with the reversible fanoption. The fan motor rotation can be changed with the monitor. The reversal of the fan motoris used to clear debris and dust from the radiator and hydraulic oil cooler.

NOTE: Operation of the hydraulic fan system will be covered in more detail later.

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OPERATOR STATION

The 320D-336D hydraulic excavator operator station has an updated look with a new colorscheme. The cab post and rear of the cab have been changed to black while the counterweightdesign has been changed with an enlarged CAT® decal and distinctive styling.

The newly designed cab features improved visibility and operator comfort. Convenientlyplaced switches, gages, information display, and controls improve operator comfort, awareness,and efficiency. Frequently used switches have been relocated to improve accessibility.

A full color Liquid Crystal Display monitor provides vital operating and performanceinformation, alerts in text, in a simple, easy to navigate format. The monitor provides increasedfunctionality for the operator.

For operator comfort, the new cab offers a fully adjustable air suspended seat with side-to-sideshock absorption, which provides maximum operator comfort.

The fuse panel has been moved to the left side of the lunch box compartment and behind theoperator's seat for easy access.

A 24-volt AM/FM radio, mounted in the right console, is standard.

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Controls in the cab include the:

- left (1) and right (2) travel pedals

- left (3) and right (4) travel pedal levers

- straight travel pedal (5) (attachment)

- right joystick (6) to control the bucket and boom (SAE excavator pattern)

- left joystick (7) to control the swing and stick (SAE excavator pattern)

The switch for one-touch low idle (AEC) is on the right joystick. The left joystick includes thehorn switch.

If the machine is equipped with a magnet, the trigger switch on the front of the right joystickturns the magnet on, while the trigger switch on the front of the left joystick turns the magnetoff.

The service hour meter (8) can be seen to the left of the attachment pedal.

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The hydraulic activation lever (1) has been redesigned, however, the lever serves the samepurpose as before.

With the lever in the down position (shown), the hydraulic activation solenoid is in the de-activated position. No hydraulic functions are available with the lever in the down position.

When the lever is moved to the up position the hydraulic activation solenoid is energized andpilot oil is available to operate the joysticks.

The ground level emergency engine shutoff switch (2) is located on the bottom of the seatmount. The shutoff switch will shut off the engine without having to climb into the cab.

Once the shutoff switch is turned ON and then OFF, the key start switch must be cycled for themachine to operate again.

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All of the operator functions are incorporated into the right side of the operator's station. Thefunctions are:

- engine speed dial switch (1)

- key start switch (2)

- cigarette lighter (3)

- soft switch panel (4)

- rocker switches (5)

- HVAC controls (6)

- radio (7)

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The soft switch panel includes switches that either turn a function ON/OFF or allows theoperator to toggle through different modes of the selected function. The soft switches providethe operator with the following functions:

Two-speed travel switch (1): When the button is pushed the travel speed is toggled betweenlow and auto.

- The rabbit indicator indicates auto speed.

- The tortoise indicator indicates low speed.

Automatic Engine Control (AEC) switch (2): The AEC function automatically reducesengine speed while there is no hydraulic demand, which reduces noise and fuel consumption.

- The AEC switch disables and enables the AEC function.

- Initially, AEC reduces the engine speed by 100 rpm after there has been no hydraulicdemand for approximately three seconds.

- Then AEC reduces the engine rpm to approximately 1300 rpm after there has been nohydraulic demand for an additional three seconds.

- The additional three second AEC delay time and the low speed of 1300 rpm can bechanged using the monitor or Caterpillar Electronic Technician (Cat ET).

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Travel alarm cancel switch (3): The travel alarm cancel switch is a momentary two-positionswitch.

- The travel alarm sounds when travel is detected.

- The travel alarm stops immediately if the travel alarm cancel switch is depressed.

- The travel alarm switch is reset every time the travel pressure switch opens.

Work tool switch (4): The work tool switch will show the selected work tool on the monitordisplay. Press the switch repeatedly to change the selected work tool. When the desired worktool is highlighted in the monitor display press the "OK" button on the monitor to select thework tool shown.

Work lights switch (5): The work lights switch toggles between the different work lightcombinations. Two different work light patterns are available.

- Pattern 1: Chassis work lights and cab work lights.

- Pattern 2: Chassis work lights, cab work lights, and boom work lights.

Upper window wipers switch(6): The wiper switch toggles between the following differentmodes of the wipers.

- six second delay.

- three second delay.

- continuous operation.

- off

Upper window washer switch(7): The windshield washer fluid switch is an ON/OFF switch.

Heavy lift mode switch (8): The Heavy lift mode switch can be selected to increase liftingcapability and provide improved controlability of heavy loads.

- When heavy lift is turned on, the main relief valve maximum pressure increases from35,000 MPa (5080 psi) to 36,000 MPa (5225 psi), making it possible to operate thesystem at a higher pressure.

- In Heavy Lift Mode, the maximum engine speed is limited to engine speed dial 6 (1510 ± 90 rpm).

- Hydraulic horsepower maximum output is reduced to 60%.


The toggle and rocker switch panel contains switches that control additional functions:

Quick coupler lock control switch (1): The quick coupler lock control switch is a springcentered toggle switch.

- The top position locks the quick coupler.

- The bottom position unlocks the quick coupler.

Fine swing control switch(2): The fine swing control switch is a two-position rocker switch.

- The top position activates fine swing control. Fine swing control improves the swingcontrol during swing deceleration.

- The bottom position deactivates fine swing control.

Rear window washer switch (3): The rear window washer fluid switch is a two-positionrocker switch.

- The top position activates the windshield washer fluid.

- The bottom position deactivates the windshield washer fluid.

Rear window wiper (4): The rear window wiper switch is a two-position rocker switch.

- The top position activates the wiper.

- The bottom position deactivates the wiper.

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The heating and air conditioning system (HVAC) is electronically controlled. The control panelfor the heating and air conditioning system is located on the right console. The switches on thecontrol panel are:

ON/OFF switch (1): Push the ON/OFF switch in order to power on the system. Push theswitch again in order to power off the system.

Automatic control switch (2): In order to enter the full "AUT" Mode for automatic climatecontrol, push this switch. However, if the switch is pushed again, the air conditioning can notbe turned off using this switch. When the system is in full "AUT" Mode, specific functions canbe manually changed by pushing another switch.

If a specific function is manually changed, "AUT" will not appear in the display, but theunchanged functions will remain in "AUT" mode.

In order to take advantage of the full "AUT" setting of the climate control system, always keepthe sunlight sensor clean. Do not obstruct the sunlight sensor. If the climate control system isin the full "AUT" setting at engine start-up and the temperature inside the cab is too warm ortoo cool, the damper for fresh air ventilation may automatically close for a few minutes. Thisaction will help to bring the air temperature to the preset temperature more quickly.

NOTE: "AUT" represents "auto".

34


Temperature switch (3): This switch controls the temperature of the air entering from the airoutlets in order to achieve the preset temperature. The preset temperature appears on display.If the heating and air conditioning system is in the automatic mode, pushing these switcheschanges the preset temperature.

LCD panel (4): The panel displays the settings of the HVAC system.

Fan switch (5): The fan switch directly controls the fan speed. If the climate control system isoperating in the automatic mode, pushing this switch overrides the automatically selected fanspeed.

Compressor switch (6): Push the switch in order to turn on the compressor or push the switchin order to turn off the compressor. In humid conditions, the compressor may be used toremove moisture from the air in the cab. In cool weather, operate the compressor weekly inorder to prevent leakage of the refrigerant gas and to help maintain the compressor in optimumworking order.

Defrost mode switch (7): Depressing this switch will defog the windows. The air will also bedehumidified while the compressor is running.

Air inlet select switch (8): This switch selects the position of the air inlet for recirculation orfor fresh air.

Air outlet select switch (9): This switch selects the position of each air outlet. Each switchcontrols a different air outlet.

- upper body switch

- upper body and floor switch

- floor switch

- floor and defroster switch

NOTE: In order to convert the temperature reading from Degrees Celsius to DegreesFahrenheit, depress both keys of the fan switch at the same time for five seconds. Thissame action is used for converting the temperature reading from Degrees Fahrenheit toDegrees Celsius.


The backup switches are located behind the right armrest. The engine speed selector switch (1)(closest to the right console) controls the engine rpm. The main backup switch (2) togglesbetween Manual Mode and Auto Mode. The backup switches are used whenever the MachineECM malfunction to allow limited mobility of the machine.

In the Manual Mode, the Monitoring System will display the message "LIMITED MOBILITYMODE" and the Monitoring System will sound the action alarm.

The main backup switch activates or deactivates the Manual Mode. When Manual Mode isactive, the Machine ECM is bypassed and a fixed power shift pressure is provided to the mainhydraulic pumps. The fixed power shift pressure limits maximum pump output and allows themachine to continue operating in a Derate Mode. Machine productivity will be limited whilethe machine is in the Manual Mode.

In the Manuall Mode, the AEC switch and the low idle switch will not function.

The engine speed switch is used to control the engine speed while the Manual Mode is active.Holding the engine speed switch in the DOWN position decreases the engine rpm. Holding theengine speed switch in the UP position increases the engine rpm.

When the switch is released the switch returns to the NEUTRAL position and the machine willmaintain the engine speed. This switch overrides the function of the engine speed dial.

The diagnostic connector (3) is located inside of the operator's station behind the right armrest,beside the back-up switches. The connector is used to connect the machine to Cat ElectronicTechnician.

35


1

2

3

The fuse panel (1) has been relocated to the left side of the lunch box panel behind theoperator's seat.

Some of the relays (2) are also part of the fuse panel.

A decal (3) on the cover identifies the circuit for each fuse or relay.

36


1

2

3

The 300D monitor has been updated. The new monitor is used on the 308D, 311D, 312D,314D,3 315D, 319D, 320D, 321D, 323D, 324D, 325D/329D, 328D, 330D/336D, 345C, 365C,and the 385C hydraulic excavators.

The monitor is a full color Liquid Crystal Display (LCD) that displays the various parametersof the machine. Shown above are the:

- alert indicator (1)

- clock (2)

- fuel gage (3)

- hydraulic oil temperature gage (4)

- engine speed dial indicator (5)

- engine coolant temperature gage (6)

- operating hours (7)

- work tool indicator (8)

37


1

2

3

4

5

6

7

8

The monitor uses eight buttons to control navigation on the monitor screen. The fourdirectional buttons are:

- left (1)

- up (2)

- down (3)

- right (4)

The directional buttons navigate the cursor through the various screens.

The four navigational buttons are:

- home (5)

- menu (6)

- back (7)

- OK (8)

38


1 2

3 4

5 6

7 8

Cat ET or the monitoring system can be used for testing and calibrating the machine. Extendedfluid change intervals are available with the proper S•O•S procedures. Maintenance intervalsfor several components and systems on the machine are programmed into the monitor.

The operator can access component maintenance intervals to see the hours remaining beforemaintenance is due. Some of the maintenance items are:

- hydraulic oil and hydraulic oil filter changes

- swing drive oil change

- travel drive oil change

- engine oil and engine oil filter changes

NOTE: Refer to the Self-study CD-ROM "300D Series Hydraulic Excavators, 345CHydraulic Excavator, and 365C & 385C Large Hydraulic Excavators (form SERV7032)for more details on the monitor.

39


40

The illustration above shows the display setup for the 300D Series excavators.

NOTE: Refer to the Self-study CD-ROM "300D Series Hydraulic Excavators, 345CHydraulic Excavator, and 365C & 385C Large Hydraulic Excavators (form SERV7032)for more details on the monitor.

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CONCLUSION

This presentation has provided information for the Caterpillar 320D-336D HydraulicExcavators.

This presentation covered a machine walkaround and focused on the operator compartment.

Additional presentations are available for each system used on these machines.

When used in conjunction with the service manual, the information in this package shouldpermit the technician to do a thorough job of analyzing a problem in these systems.

For service repairs, adjustments, and maintenance, always refer to the Operation andMaintenance Manual, Service Manuals, and other related service publications.

41


Documents

320D-336D Excavator Intro