325d - technical npi
TRANSCRIPT
SERV7105-12Vol. 12, No. 1December 2005
TECHNICAL PRESENTATION
325D HYDRAULIC EXCAVATORINTRODUCTION
New Product Introduction(NPI)
GLOBAL SERVICE LEARNING
325D HYDRAULIC EXCAVATORINTRODUCTION
AUDIENCEService personnel who understand the principles of machine systems operation, diagnosticequipment, and testing and adjusting procedures.
CONTENTThis presentation provides new and different New Product Introduction (NPI) information onthe 325D Hydraulic Excavator. This presentation may be used for self-paced and self-directedtraining. This first printing contains information on the EAME Market Gosselies produced325D only. The 325D will be available in the NACD and APD markets early in 2006.
OBJECTIVESAfter learning the information in this presentation, the technician will be able to:
1. locate and identify the new major components on the 325D Hydraulic Excavator, and
2. explain the operation of the new components in the system.
REFERENCESNOTE: The references listed below are only for the EAME Market Gosselies produced 325D.Reference materials for Aurora and Akashi produced 325D machines will be released at a laterdate.
325D Hydraulic Excavator Specalog HEHH3290
325D Hydraulic Excavator Specifications Manual RENR7233
325D Hydraulic Excavator Systems Operations Manual RENR7234
325D Hydraulic Excavator Test and Adjust Manual RENR7235
325D Hydraulic Excavator Parts Book SEBP4442
325D Hydraulic Excavator Tool Control Systems Operation RENR7389
Estimated Time: 1 HourVisuals: 37Handouts: 4Form: SERV7105-12Date: Vol. 12, No. 1, 2005
© 2005 Caterpillar Inc.
TABLE OF CONTENTS
INTRODUCTION ..................................................................................................................5Similarities and Differences .............................................................................................6
MACHINE WALK-AROUND...............................................................................................7
OPERATOR'S STATION......................................................................................................13
ENGINE................................................................................................................................24
HYDRAULIC SYSTEM ......................................................................................................26
MAINTENANCE ITEMS ....................................................................................................40
TOOL CONTROL SYSTEM ...............................................................................................41
CONCLUSION.....................................................................................................................43
HYDRAULIC SCHEMATIC COLOR CODE.....................................................................44
HANDOUTS.........................................................................................................................45
POSTTEST ...........................................................................................................................46
POSTTEST ANSWER KEY ................................................................................................48
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NOTES
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INTRODUCTION
The 325D is a new model from Caterpillar and is a direct replacement for the 325C HydraulicExcavator. The 325D was first introduced in December 2005 to the EAME market. The 325Doperating weight is approximately 29,240 Kg (64,500 lbs) for a long undercarriage machine.The 325D fits in the 25 metric ton class of excavators. The 325D is a versatile machine capable of performing a wide range of tasks by using various work tools available.
The presentation discusses the component locations and systems operation of the Gosselies produced 325D Hydraulic Excavator. Basic engine and machine component locations will bediscussed. The travel system and implement hydraulics will also be covered.
There will be different machine arrangements available in the EAME market, including:
- 325D L (325D excavator with a long, fixed standard width undercarriage)
- 325D LN (325D excavator with a long, fixed narrow width undercarriage)
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325D HYDRAULIC EXCAVATORSINTRODUCTION
© 2005 Caterpillar Inc.
2
Similarities and Differences
The above chart displays the similarities and differences between the 325D and the 325C.
This illustration compares the basic features of the 325D to the previous 325C. The chartillustrates if the features are different, similar, or the same.
New and improved features include:
- Tier III ACERT engine
- Cab and styling
- Monitoring system
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SIMILARITIES AND DIFFERENCESFEATURES DIFFERENT SIMILAR SAME
X
X
X
X
X
X
X
X
X
X
Machine Appearance
Monitoring System
Maintenance Items
Tool Control Systems
Machine ECM
Travel System
Engine
OperatorÕs Station
Implement Hydraulic System
Undercarriage
MACHINE WALKAROUND
- Stick (1)
- Boom (2)
- Operator station (3)
- Access door behind cab (4)
- Engine access cover (5)
- Access door to radiator compartment (6)
- Counterweight (7)
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The compartment behind the operator station includes the following components:
- Machine and Tool Control ECM (1)
- Air conditioning condenser and receiver (2)
- Window washer reservoir (3)
- Master disconnect switch and circuit breakers (4)
- Dual element, radial seal air filter (5)
- Batteries (6)
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2
3
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6
5
The radiator access compartment is located in front of the counter weight. 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)
- Fuel pressure sensors (2)
- Hydraulic oil cooler (3)
- Fuel priming pump (4) (will be changed to electric)
- Fuel filter (5)
- Ether start aid solenoid (6)
- Engine coolant overflow bottle (7)
- Fuel water separator (8)
- Radiator (located behind the water separator and coolant overflow bottle) (9)
- Pattern change valve (not shown) located on compartment floor.
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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 reservoir (2) is located between the pump compartment and thediesel fuel 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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5
2
4
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:
- Quick coupler solenoid valve (1)
- Engine oil S•O•S port (2)
- Engine oil filter (3)
- Pilot pump (4)
- Medium pressure solenoids (5)
- Medium pressure circuit pump (6)
- Pressure taps for auxiliary tool solenoids (7)
- Pilot filter (8)
- Pilot system S•O•S port (9)
- Pilot system pressure port (10)
- Pilot system relief valve (11)
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10
11
84
67
1
2
3
5
Additional visible components are:
- Power shift solenoid and proportional reducing valve (PSPRV) (12)
- Right pump horsepower adjustment (13)
- Right pump swashplate maximum angle adjustment (14)
- Right pump (15)
- Left pump (16)
- Left pump horsepower adjustment (17)
- Left pump swashplate maximum angle adjustment (18)
- Hydraulic system return oil filter (19)
- Case drain filter (20)
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14
15
16
20
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OPERATOR'S STATION
The 325D contains a newly designed cab and introduces a new operator's station with improvedvisibility and operator comfort. For operator comfort the new cab offers a fully adjustable airsuspended seat with side-to-side shock absorption, which provides maximum operator comfort.The new "D" series monitor provides increased functionality for the operator. Convenientlyplaced switches, gauges, information display, and controls improve operator comfort, awareness, and efficiency. The fuse panel is relocated to the left side of the lunch box compart-ment behind the operator’s seat. A 24 volt AM FM radio is standard in the right console.
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The hydraulic activation lever (1) has been redesigned for the 325D, however, its purpose isstill the same. With the lever in the DOWN position (shown), the hydraulic activation solenoidis in the de-activated position.
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. Oncethe shutoff switch is turned ON and then OFF, the key start switch must be cycled for themachine to operate again.
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1
2
All of the operator functions are incorporated into the right side of the operator's station. Theyare:
- Engine speed dial switch (1)
- Key start switch (2)
- Cigar lighter (3)
- Soft switch panel (4)
- Rocker switches (5)
- HVAC controls (6)
- Radio (7)
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2
3 4 5 6
7
The soft switch panel includes switches that either turn a function on/off or allow the operatorto toggle through different modes of the selected function. The soft switches provide the operator with the following functions:
Two-speed travel (1)
When the button is pushed the travel speed is toggled between low and auto.
- The rabbit indicator indicates auto speed.
- The tortoise indicator indicates low speed.
Automatic Engine Speed Control (AESC) Switch (2)
The AESC function automatically reduces engine speed while there is no hydraulic demand,which reduces noise and fuel consumption.
- The AESC switch disables and enables the AESC function.
- The first stage AESC reduces the engine speed by 100 rpm after there has been nohydraulic demand for approximately three seconds.
- The second stage AESC reduces the engine rpm to approximately 1300 rpm after therehas been no hydraulic demand for an additional three seconds.
- The second stage AESC delay times and rpm can be changed using the monitor orCaterpillar Electronic Technician (Cat ET).
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8765
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Travel alarm cancel (3)
The travel alarm cancel switch is a momentary two-position switch.
- 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 display the selected work tool on the monitor display. Press theswitch repeatedly to change the selected work tool. When the desired work tool is highlightedin the monitor display press the "OK" button on the monitor to select the work tool shown.
Work lights (5)
The work lights switch toggles between the different work light combinations.
- Pattern 1 - Chassis work lights and cab work lights.
- Pattern 2 - Chassis work lights, cab work lights, and boom work lights.
Upper window wipers (6)
The wiper switch toggles between the different modes of the wipers.
- Six second delay.
- Three second delay.
- Continuous operation.
- Off.
Upper window washer (7)
The windshield washer fluid switch is an ON/OFF switch.
Heavy lift (8)
The heavy lift mode can be selected to boost lifting capability and provide improved controlability of heavy loads.
- When heavy lift is turned on, the main relief valve maximum pressure increases from 35,000 MPa (5080 psi) to 36,000 MPa (5225 psi), making it possible to operate at thehigh 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 (1)
The quick coupler lock control switch is a spring centered toggle switch.
- The top position locks the quick coupler.
- The bottom position unlocks the quick coupler.
Fine swing control (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 (3)
The rear window washer fluid switch is a two-position rocker switch.
- The top position activates the windshield washer fluid.
- The bottom position deactivates the windshield washer fluid.
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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.
The back-up switches are located behind the right armrest. The right switch (1) controls theengine rpm. The left switch (2) toggles between back-up and auto.
The left switch activates/deactivates the Back-up Mode. When Back-up Mode is active, a fixedpower shift pressure is provided to the pumps. The fixed power shift pressure limits maximumpump output and allows the machine to continue operating in a Derate Mode. Machine productivity will be limited while the machine is in Back-up Mode.
The right switch is used to control the engine speed while Back-up Mode is active. Holding theright switch in the DOWN position decreases the engine rpm. Holding the right switch in theUP position increases the engine rpm.
The diagnostic connector (3) is located inside of the operator's station behind the right armrest,beside the back-up switches.
The HVAC control ECM (4) is also located below the right console.
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2
3
4
The 325D monitor has been updated. The 325D shares this new monitor with the 320D, 323D,324D, 330D, 345C, 365C, and the 385C machines.
The monitor is a full color Liquid Crystal Display (LCD) that displays the various parametersof the machine.
- Alert Indicator (1)
- Clock (2)
- Fuel Gauge (3)
- Hydraulic Oil Temperature Gauge (4)
- Engine Speed Dial Indicator (5)
- Engine Coolant Temperature Gauge (6)
- Operating Hours (7)
- Work Tool Indicator (8)
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2
3
4
5
6
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The monitor contains eight buttons that control navigation on the monitor screen. The fourdirectional button are left (1), up (2), down (3), and right (4). The directional buttons navigatethe cursor through the various screens.
The four navigational buttons are home (5), menu (6), back (7), and OK (8).
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3 4
5 6
7 8
The fuse panel for the 325D has been relocated to the left side of the lunch box panel behindthe operator's seat.
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ENGINE
The 325D is equipped with a C7 ACERT Engine (1). It is rated at 140 kW (188 hp) at 1800 rpm.
Also visible is the engine crankcase breather (2), engine oil dipstick (3), S•O•S coolant sampling valve (4), engine oil fill (5), and the inlet air heater (6).
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4
3
6
2
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The engine cooling fan on the 325D is now mechanically driven off the front of the engine.
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HYDRAULIC SYSTEM
The 325D uses a negative flow type hydraulic system. The main control valve and pumps aresimilar to the 325C. The engine cooling fan is now driven off of the engine. The 325D continues using many of the “C “excavator features, such as automatic priorities and tool con-trol systems.
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Stick Cylinder
Bucket Cylinder Boom Cylinders
Swing Motor Travel Motors
PilotControlValves
PriorityValves
MainHydraulic
Pumps
MPilot
Pump
Tank
Pilot Manifold
Main Control Valve Group
MAIN HYDRAULIC SYSTEM
The pilot pump (1) is driven off the right hydraulic pump. The pilot pump draws oil from themain pump suction line. The oil is sent to the pilot filter and then to the pilot system.
The medium pressure pump (2), when installed, is driven off the left hydraulic pump. Themedium pressure pump also draws oil from the main pump suction line.
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2
The 325D pilot manifold is the same as the "C" pilot manifold. The pilot manifold is accessibleby removing the cover plate under the machine, behind the swing bearing. The manifold islocated 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)
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2
3
4
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The main hydraulic system is a negative flow controlled system. The main hydraulic systemsupplies hydraulic power at high pressures and high flow rates to perform work. Two mainhydraulic pumps supply oil to the main control valve group. The individual hydraulic circuitsare controlled by valves in the the main control valve group.
The main hydraulic system supplies the following circuits:
- Swing
- Stick
- Travel
- Boom
- Bucket
- Tool control
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BL2 AL2
M
Swing Motor
Travel Left Travel Right
BucketCylinder
BoomCylinder
BoomCylinder
StickCylinder
AR3 BR3 AR4 BR4
AL3 BL3
Stick Swing BoomBucket
OUT IN RIGHT LEFT OPEN CLOSE DOWN UP
No.1Travel
No.2Swing
No.3Lock
Out In
Stick 2OUT
Boom 1UP
BucketOPEN
AtchTravel RFWD
Trv LFWD
Swing RStick 1OUTBoom 2
BL1 AR1BR1
Travel Motor RightTravel Motor LeftHigh Pressure Line
Single Single
DoubleDouble325D HYDRAULIC SCHEMATIC
NEUTRAL
AL1
P
aL1 bR1aR1bL1
PU2aR1aR2 PL2
P
P
PU2
PL2 bL4 bL3 bL2 bL1
BL3 AL3
aL1
BL1BL1
AL1
AL1
aL2BR4AR4aR4BR3AR1
aR3aR2aR1
BR1 AR3
bR1 bR2 bR3 bR4
bL3 bL2 bL4 aL2aR3 aR4 bR3bR4
The 325D uses a Caterpillar designed main hydraulic pump group (1) rated at 2 x 235 L/Min (2 x 65 gpm). The pump group is similar to the pump group used on the 325C.
The right pump (6) is driven by the engine via a flexible coupling. The left pump (9) is drivendirectly off the right pump. Each pump rotating group has its own regulator. The regulators areused to adjust the output flow of the pumps. Each pump rotating group also has its own pressure tap and pressure sensor.
A power shift PRV (2) is mounted on the top, rear of the right regulator case. The power shiftPRV uses pilot system oil and sends it to the main hydraulic pumps as a control signal pressure.The power shift pressure is measured at pressure tap (3).
Additional pump and components shown in this photo are:
- Right pump regulator horsepower adjustment (4)
- Right pump regulator swashplate maximum angle adjustment (5)
- Left pump regulator horsepower adjustment (7)
- Left pump regulator swashplate maximum angle adjustment (8)
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The 325D contains one case drain filter (1) for the pump case drain and the swing and travelsystem case drains. The case drain filter is located in the main pump compartment.
The pilot oil filter (4) is also located in the main pump compartment. The pilot oil filter basecontains the pilot system relief valve (2), the hydraulic system S•O•S test port (3), and the pilotoil pressure test port (5).
The hydraulic oil level sight gauge (6) is located on the rear of the hydraulic tank and is visiblein the pump compartment. The return hydraulic system oil filter (7) is also located in the pumpcompartment.
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The engine oil filter (1) is remotely mounted in the pump compartment for easy serviceability.The engine oil filter base contains the engine oil S•O•S port (2).
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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 in the correct direction.When a control valve shifts, oil flows from the main hydraulic pumps to the appropriatehydraulic cylinder or hydraulic motor to perform work. The 325D main control valve is similarto the 325C valve. The valves are:
- Stick 2 (1)
- Boom Rod End Relief Valve (2)
- Boom 1 (3)
- Bucket (4)
- Attachment (5)
- Right Travel (6)
- Straight Travel Valve (7)
- Main Relief Valve (8)
- Right Side NFC Relief Valve (9)
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9
72 4 6
Additional valves in the main control valve are:
- Left Travel (10)
- Swing (11)
- Stick 1 (12)
- Boom 2 (13)
- Auxiliary Valve for Tool Control (14)
- Left Side NFC Signal Line (15)
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15
11 1210
Two travel pressure switches (not shown) and the swing/implement pressure switch (1), arelocated under the cab. The pressure switches are activated by pilot oil. The switches close at490 ± 49 kPa (71 ± 7 psi) and open at 290 ± 0 kPa (42 ± 0 psi).
The pressure switches are inputs to the Machine and Tool Control ECM. The Machine andTool Control ECM uses these inputs to tell when a hydraulic function has been activated andwill turn the Automatic Engine Speed Control (AESC)/one touch low idle back to the currentspeed dial setting. When only the swing/implement pressure switch is activated, the Machineand Tool Control ECM will release the swing brake. When all three pressure switches are activated, the Machine and Tool Control ECM will energize the straight travel solenoid.
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1
The 325D has a pilot operated, two stage main relief valve. The relief valve settings are 35000 ± 490 kPa (5080 ± 71 psi) for implement/travel and 36000 ± 490 kPa (5225 ± 71 psi) forheavy lift mode. The high pressure setting for heavy lift must be correctly adjusted beforeadjustments can be made for implement/travel settings. Refer to the Testing and Adjustingmanual RENR7235 for the proper procedure on setting the main relief valve.
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The 325D is available with the heavy lift option. Heavy lift provides a means to have increasedhydraulic pressure available to help complete the task.
Heavy lift is activated by pressing the heavy lift switch (1) on the soft switch panel in the operators station. The heavy lift switch is an input to the Machine and Tool Control ECM. TheMachine and Tool Control ECM limits engine speed to speed dial 6 and activates the heavy liftsolenoid (2), which directs pilot oil to the main relief valve (3). At the same time the Machineand Tool Control ECM increases the power shift pressure to decrease the pump output flow.Decreasing the pump output flow provides increased controlability and hydraulic smoothnessduring a heavy lift operation. Heavy lift mode limits the pumps to a maximum of approximately 60% of the normal hydraulic horsepower.
Heavy Lift Specs:
- Engine rpm for Heavy Lift is the engine speed dial 6 setting.
- Hydraulic horse power is limited to 60% of full power during Heavy Lift.
- Main relief maximum pressure during Heavy Lift is 36000 kPa ± 490 kPa(5225 ± 71 psi).
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3
2
1
The 325D uses automatic priorities for certain functions based on the position of the joysticks.
The boom priority (1) and the swing priority (2) pressure reducing valves are located behind theswing bearing on the left side of the machine.
The boom priority PRV provides boom up priority over the stick in function. The swing-priority PRV provides swing priority over the stick in or stick out function.
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The 325D has one swing motor (1) that receives oil from the swing control valve. The swingcontrol valve receives pump oil from the left pump. The swing drive oil level can be checkedwith dipstick (2).
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MAINTENANCE ITEMS
Caterpillar Electronic Technician (Cat ET) or the monitoring system can be used for testing and calibrating the machine.
Extended fluid change intervals are available with the proper S•O•S procedures.
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TOOL CONTROL SYSTEM
The tool control system for the 325D is similar in function to the tool control systems for the320C - 330C medium excavators, although the medium pressure circuit is now a stand-alonefunction.
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 325D is available in the EAME market with the following factory installed Tool Controlsystems:
- System 16 - provides two pump flow in a single direction, has a direct return system tothe hydraulic tank, and includes a mechanical line relief valve (LRV) for lower psi tools(single action).
- System 17 (Multifunction) - provides one or two pump flow in one or two directions(single action or double action) and has a direct return system to the hydraulic tank.System 17 has full electronic controls and features an independent medium pressure circuit used for such applications as a rotating shear or ditch cleaning bucket.
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The 325D will be available in the NACD and APD markets early in 2006. The 325D's pro-duced in Akashi and Aurora can be equipped with the following factory installed Tool Controlsystems:
- System 3 (Hammer) - provides two pump flow in a single direction only. This systemalso includes a mechanical LRV for lower psi tools (single action).
- System 5/15 (Thumb) - provides one pump flow in both directions (extend/retract doubleaction) and can be controlled with a foot pedal (system 5) or with joystick buttons (sys-tem 15).
- 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 and features anindependent medium pressure circuit used for such applications as a rotating shear orditch cleaning bucket.
CONCLUSION
This presentation has provided New Product Introduction (NPI) information for the Caterpillar325D Hydraulic Excavator. The new components and their locations were identified and discussed. The information in this NPI document pertains to the 325D Hydraulic Excavatorsthat will first be produced in Gosselies for the EAME market. This document will be updatedas the Akashi and Aurora produced machines near their first ship dates.
Refer to the latest service literature for more information and specifications.
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HYDRAULIC SCHEMATIC COLOR CODES
The colors on the hydraulic schematics and cross-sectional views shown throughout this presentation denote specific meanings. This illustration identifies the meaning of each color.
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Red - High Pressure Oil
Red / White Stripes - 1st Pressure Reduction
Pink - 3rd Reduction in Pressure
Red / Pink Stripes - Secondary Source Oil Pressure
Orange - Pilot, Charge or Torque Converter Oil
Blue - Trapped Oil
Brown - Lubricating Oil
Cat Yellow - (Restricted Usage)
Green / White Stripes -Scavenge / Suction Oil or Hydraulic Void
Identification of Componentswithin a Moving Group
Black - Mechanical Connection. Seal
Dark Gray - Cutaway Section
Light Gray - Surface Color
White - Atmosphere or Air (No Pressure)
Purple - Pneumatic Pressure
Yellow - Moving or Activated Components
Orange / Crosshatch - 2nd Reduction in Pilot,Charge, or TC Oil Pressure
Orange / White Stripes - Reduced Pilot, Charge, orTC Oil Pressure
Red Crosshatch - 2nd Reduction in Pressure
Green - Tank, Sump, or Return Oil
HYDRAULIC SCHEMATIC COLOR CODE
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Red
- H
igh
Pres
sure
Oil
Red
/ W
hite
Str
ipes
- 1
st P
ress
ure
Red
uctio
n
Pink
- 3r
d R
educ
tion
in P
ress
ure
Red
/ Pi
nk S
trip
es -
Seco
ndar
y So
urce
Oil
Pres
sure
Ora
nge
- Pilo
t, C
harg
e or
Tor
que
Con
vert
er O
il
Blu
e - T
rapp
ed O
il
Bro
wn
- Lub
ricat
ing
Oil
Cat
Yel
low
- (R
estr
icte
d U
sage
)
Gre
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SERV7105-12 - 46 - NPIVol. 12, No. 1, 2005 Handout No. 2
Posttest
Directions: Circle the correct letter indicating the best answer for each question.
1. Which of the following features on the 325D is the same as it was on the 325C?
A. EngineB. Operator's stationC. UndercarriageD. Monitoring system
2. What will cause the monitoring system master condition lamp to blink ON and OFF?
A. High hydraulic oil temperatureB. Low engine oil pressureC. High coolant temperatureD. Low hydraulic system oil level
3. Which Tool Control system is not available on the Gosselies produced 325D?
A. Medium pressure circuitB. System 15C. System 16D. System 17
4. The service tool diagnostic connector is relocated on the 325D to the:
A. radiator compartmentB. air cleaner/battery compartmentC. in the cab behind the operator's seatD. in the cab in the right console
5. What information is shown in the lower display window on the monitor?
A. Tool control currently selectedB. Engine rpmC. Service meter hoursD. Hydraulic oil pressure
6. Which component is no longer located in the radiator compartment?
A. Hydraulic oil coolerB. Machine and Tool Control ECMC. Fuel filterD. Fuel pressure sensors
SERV7105-12 - 47 - NPIVol. 12, No. 1, 2005 Handout No. 3
Posttest (continued)7. Which function is not prioritized by the priority pressure reducing valves?
A. Boom upB. Stick inC. Boom downD. Stick out
8. The boom and swing priority pressure reducing valves are located:
A. Beneath the operator platform below the seatB. Behind the swing bearing on the right sideC. Behind the swing bearing on the left sideD. Beneath the operator platform below the foot pedals
9. The Auxiliary valve for the Tool Control is located on the left end of the main controlvalve.
A. TrueB. False
10. The main implement pumps on the 325D are rated at:
A. 2 X 230 L/minB. 2 X 235 L/minC. 2 X 240 L/minD. 2 X 245 L/min
SERV7105-12 - 48 - NPIVol. 12, No. 1, 2005 Handout No. 4
Posttest Answer Key1. C2. D3. B4. D5. A6. B7. C8. C9. A
10. B