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Caterpillar hydraulic excavators serie D

TIER III ENGINES

This presentation provides an introduction and machine walkaround for the 320D-336D

Hydraulic 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

OBJECTIVES

After 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

REFERENCES

Self-study "300D Series Hydraulic Excavators, 345C Hydraulic Excavator,

iTIM " '300C' Series Hydraulic Excavators-Electronic Control Systems" SERV2693iTIM "325C Hydraulic Excavators-Hydraulic Systems" SERV2701

Estimated Time: 1 Hour

Illustrations: 41

Form: SERV1852-02

Date: August 2008

© 2008 Caterpillar

TABLE OF CONTENTS

INTRODUCTION 5

MACHINE WALK-AROUND 14

325D Hydraulic Excavator 16

330D Hydraulic Excavator 25

OPERATOR STATION 33

CONCLUSION 48

"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 330D

nomenclature changed The 325D became the 329D and the 330D became the 336D for most 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.

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

replacement 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 and

330D excavators The other models will be configured similarly, but component

locations may be different Some of the illustrations may show pilot iron instead of

production iron

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

300D SERIES HYDRAULIC EXCAVATORS

Model Engine Configurations Available 320D C6.4 L, LN, FM, MH, RR, L RR, LL 321D C6.4 CR, LCR

323D C6.4 L, LN, S, SA 324D C7 L, LN, FM 325D/329D C7 L, LN, FM, MH, L MH, UHD, L HW, L HD 328D C7 LCR

330D/336D C9 L, LN, FM, MH, WH, L HD, L RE, U HD, L HW

During the fourth quarter of 2008, the 325D became the 300D and the 330D became the 336D for most machine configurations

The 325D MH and 330D MH did not change The 325D FM and 330D FM did not change The 325D HD HW was discontinued.

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 withACERTTMTier III engines

NOTE: Some of the "D" Series excavators arrangements are built using Tier II engines

to 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: forest

machine (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 actual

machine 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, or

as 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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X Machine Appearance

SIMILARITIES AND DIFFERENCES

FEATURES DIFFERENT SIMILAR SAME

X Operator s Station

X Engine

X Implement Hydraulic System

X Monitoring System

X Tool Control Systems

X Maintenance Items

X Travel System

X Undercarriage

X Machine ECM

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 operator

comfort 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 ACERTTMengines 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 and

performance 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 control

systems for the 320C - 330C medium excavators, although the medium pressure circuit is now

a 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 with

an embedded electronic chip for controlling unauthorized machine operation

Product Link: This option provides all kinds of information and working parameters

through 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 special

software

Auxiliary Hydraulic Options: This option allows the machine to be configured to meet

the 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

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

Main Hydraulic Pumps M

Pilot Pump Fan

Motor

Pilot Manifold

Main Control Valve Group

Fan Pump Tank

MAIN HYDRAULIC SYSTEM

The Fan Motor and Pump are only Used on the 330D and 336D

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 system

also 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 double

action) 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 to

the 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 for

applications 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)

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 components

and their locations on the 300D Series excavators These locations may vary between the other models.

The locations and components used on the 320D, 321D, 323D, 324D and 328D will be more 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 most

machines a window washer solvent reservoir would be shown behind the master

disconnect switch and circuit breakers.

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1 2

3

5 4

6

The radiator access compartment is located in front of the counterweight The door is hinged

on the right and has a locking latch on the left side to keep it closed This door provides access

to 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

The illustration shows the pump compartment on the right side of the machine The

compartment 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)

- 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 pilot

manifold is accessible by removing the cover plate under the machine, behind the swingbearing The manifold is located directly below the main control valve Pilot manifold

components visible are:

- two-speed travel solenoid (1)

- swing brake solenoid (2)

- hydraulic activation valve (3)

- hydraulic activation solenoid (4)

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 main

control valve group The valves are:

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

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

- straight travel valve (7)

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

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 due

to the use of the C6.4 engine

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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