992 G Wheel Loader 5IMPLEM

Service Training MALAGA

992G WHEEL LOADER

5. IMPLEMENT SYSTEM 1. Components Layout 2. Operation 3. Testing & Adjusting Adolfo OCTOBER 1997

Page:

ELECTRO-HYDRAULIC IMPLEMENT SYSTEM 5-2

VARIABLE PUMP PILOT SOLENOID VALVE RELIEF VALVE IMPLEMENT HYDRAULIC PUMPS

ELECTRONIC CONTROL MODULE

PILOT PUMP

PILOT CONTROL LEVER MODULE MAIN CONTROL VALVE ASSEMBLY

LIFT TILT LINKAGE CYLINDER POSITION SENSOR

ELECTRONIC SYSTEM

MAIN HYDRAULIC SYSTEM

HYDRAULIC PILOT SYSTEM

COMMON TO BOTH SYSTEMS

992G WHEEL LOADER

LIFT LINKAGE POSITION SENSOR

CHAPTER : IMPLEMENT SYSTEM

HYDRAULIC TANK

TILT CYLINDER

Page:

ELECTRONIC IMPLEMENT CONTROL SYSTEM

5-3

IMPLEMENT ELECTRONIC CONTROL MODULE (MAC-14)

CAT DATA LINK INPUT COMPONENTS

TILT LEVER SENSOR LIFT LEVER SENSOR

IMPLEMENT LOCKOUT SWITCH

PILOT ON/OFF SOLENOID VARIABLE PUMP SOLENOID TILT RACKBACK SOLENOID NO. 1 TILT RACKBACK SOLENOID NO. 2 TILT DUMP SOLENOID NO. 1

LIFT LINKAGE SENSOR

TILT LINKAGE SENSOR

LIFT LOWER SOLENOID NO. 1 LIFT LOWER SOLENOID NO. 2 LIFT RAISE SOLENOID NO. 1 LIFT RAISE SOLENOID NO. 2 LIFT LOWER KICKOUT DETENT SOLENOID LIFT RAISE KICKOUT DETENT SOLENOID BUCKET KICKOUT DETENT SOLENOID

992G WHEEL LOADER

TILT DUMP SOLENOID NO. 2


LIFT/LOWER/TILT KICKOUT SWITCH

OUTPUT COMPONENTS

Page: 5-4

ELECTRO-HYDRAULIC IMPLEMENT SYSTEM PILOT SYSTEM COMPONENTS

TILT CYLINDER

RIGHT LIFT CYLINDER

LEFT LIFT CYLINDER

SHUTTLE VALVE IMPLEMENT LOCKOUT SWITCH

RAISE/LOW/TILT KICKOUT SET SWITCH

PRESSURE REDUCING VALVE

BUCKET KICKOUT DETENT SOLENOID TILT LEVER SENSOR


LIFT KICKOUT DETENT SOLENOID

PILOT ON/OFF VALVE

CHECK VALVE

CHECK VALVE

LOWER KICKOUT DETENT SOLENOID LIFT LEVER SENSOR

IMPLEMENT CONTROL VALVE

RELIEF VALVE

FIXED PUMP

PILOT RELIEF VALVE

RELIEF VALVE

FILTER

PILOT PUMP

VARIABLE PUMP SOLENOID VALVE

VARIABLE PUMP

992G WHEEL LOADER


CAT DATA LINK



TILT LINKAGE POSITION SENSOR

992G WHEEL LOADER CHAPTER : IMPLEMENT SYSTEM

COMPONENTS

SERVICE TOOL CONNECTOR

VENT VALVE

Page:

5-5

FILL CAP

HYDRAULIC TANK


PILOT SYSTEM COMPONENTS

PILOT PUMP

PUMP OUTLET

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5-6

IMPLEMENT VARIABLE PISTON PUMP

PILOT CIRCUIT PRESSURE TAP


PILOT CIRCUIT COMPONENTS

OIL FILTER BYPASS SWITCH

OIL OUTLET

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5-7

HYDRAULIC OIL FILTER

OIL INLET


PILOT CIRCUIT COMPONENTS

PILOT RELIEF VALVE

PILOT RELIEF VALVE PRESSURE SENSOR

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5-8

SIGNAL LINE



MAIN CONTROL VALVES

TILT ROD END LINE RELIEF VALVE

PILOT CONTROL SOLENOID VALVES

TILT HEAD END LINE RELIEF VALVE

PILOT ON/OFF SOLENOID VALVE

LIFT ROD END LINE RELIEF VALVE

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5-9

FLOAT VALVE

FIXED PUMP RELIEF VALVE

LIFT HEAD END LINE RELIEF VALVE FLOAT SEQUENCE VALVE


IMPLEMENT PUMPS

VARIABLE PUMP

CASE DRAIN

Page:

5-10

FIXED PUMP

Page: 5-11

ELECTRO-HYDRAULIC IMPLEMENT SYSTEM MAIN HYDRAULIC SYSTEM COMPONENTS

TILT CYLINDER

RIGHT LIFT CYLINDER

LEFT LIFT CYLINDER







PILOT ON/OFF VALVE

CHECK VALVE

CHECK VALVE



RELIEF VALVE

FIXED PUMP

PILOT RELIEF VALVE

RELIEF VALVE FILTER

PILOT PUMP


VARIABLE PUMP

992G WHEEL LOADER


CAT DATA LINK




Page: 5-12

VARIABLE PUMP SOLENOID VALVE TO PILOT SYSTEM

VARIABLE IMPLEMENT PUMP LESS THAN 2400kPa (350 psi)

TO TANK PILOT RELIEF VALVE

TO IMPLEMENT CONTROL VALVE

FLUID SAMPLING PORT

LOAD LIMIT CONTROL

SHUTTLE VALVE

SMALL ACTUATOR PILOT PUMP

LARGE ACTUATOR

PUMP

992G WHEEL LOADER

PILOT FILTER


PRESSURE CUTOFF

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5-13

TO PILOT SYSTEM

VARIABLE IMPLEMENT PUMP LESS THAN 24,500 kPa (3550 psi)



FLUID SAMPLING PORT

LOAD LIMIT CONTROL

SHUTTLE VALVE


LARGE ACTUATOR

PUMP

992G WHEEL LOADER

PILOT FILTER


PRESSURE CUTOFF



IMPLEMENT PILOT RELIEF

VARIABLE PUMP SOLENOID VALVE CONTROLS PILOT PRESSURE TO LOAD LIMITING CONTROL VALVE ON VARIABLE PUMP CONTROL ECM ENERGIZES SOLENOID WHEN KEY SWITCH ON RECEIVES CONSTANT SIGNAL FROM ECM SUPPLIES PILOT OIL TO LOAD LIMIT CONTROL MAINTAINS 80% PUMP FLOW (27600
Page:

5-14

Page: 5-15

VARIABLE PUMP SOLENOID VALVE TO PILOT SYSTEM

VARIABLE IMPLEMENT PUMP MORE THAN 28,940 kPa (4200 psi)



FLUID SAMPLING PORT

LOAD LIMIT CONTROL

SHUTTLE VALVE


LARGE ACTUATOR

PUMP

992G WHEEL LOADER

PILOT FILTER


PRESSURE CUTOFF

Page: 5-16

ELECTRO-HYDRAULIC IMPLEMENT SYSTEM

TILT CYLINDER

RIGHT LIFT CYLINDER

LEFT LIFT CYLINDER

HOLD SHUTTLE VALVE IMPLEMENT LOCKOUT SWITCH






PILOT ON/OFF VALVE

CHECK VALVE

CHECK VALVE



FIXED PUMP

RELIEF VALVE

PILOT RELIEF VALVE

RELIEF VALVE FILTER

PILOT PUMP


VARIABLE PUMP

992G WHEEL LOADER


CAT DATA LINK




Page: 5-17


TILT CYLINDER

RIGHT LIFT CYLINDER

LEFT LIFT CYLINDER

SLOW TILT SHUTTLE VALVE IMPLEMENT LOCKOUT SWITCH



BUCKET KICKOUT DETENT SOLENOID


LIFT KICKOUT DETENT SOLENOID TILT LEVER SENSOR

PILOT ON/OFF VALVE

CHECK VALVE

CHECK VALVE



FIXED PUMP

RELIEF VALVE

PILOT RELIEF VALVE

RELIEF VALVE FILTER

PILOT PUMP


VARIABLE PUMP

992G WHEEL LOADER


CAT DATA LINK




Page: 5-18


TILT CYLINDER

RIGHT LIFT CYLINDER

LEFT LIFT CYLINDER

FAST TILT SHUTTLE VALVE IMPLEMENT LOCKOUT SWITCH






PILOT ON/OFF VALVE

CHECK VALVE

CHECK VALVE



FIXED PUMP

RELIEF VALVE

PILOT RELIEF VALVE

RELIEF VALVE FILTER

PILOT PUMP


VARIABLE PUMP

992G WHEEL LOADER


CAT DATA LINK




Page: 5-19


TILT CYLINDER

RIGHT LIFT CYLINDER

LEFT LIFT CYLINDER

SLOW LIFT SHUTTLE VALVE IMPLEMENT LOCKOUT SWITCH





PILOT ON/OFF VALVE

CHECK VALVE


CHECK VALVE

FIXED PUMP

RELIEF VALVE

PILOT RELIEF VALVE

RELIEF VALVE FILTER

PILOT PUMP


VARIABLE PUMP

992G WHEEL LOADER






CAT DATA LINK


Page: 5-20


TILT CYLINDER

RIGHT LIFT CYLINDER

FAST LIFT

LEFT LIFT CYLINDER






PILOT ON/OFF VALVE

CHECK VALVE


CHECK VALVE

FIXED PUMP

RELIEF VALVE

PILOT RELIEF VALVE

RELIEF VALVE FILTER

PILOT PUMP


VARIABLE PUMP

992G WHEEL LOADER






CAT DATA LINK


Page: IMPLEMENT HYDRAULIC SYSTEM

5-21

HOLD


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

LOWER

RIDE CONTROL

PILOT ON/OFF VALVE

FLOAT SEQUENCE VALVE RAISE

FLOAT VALVE FLOAT VALVE

DUMP

DUMP

RAISE

FAN MOTOR PRESSURE CUTOFF

COOLER

SHUTTLE VALVE

FLUID SAMPLING PORT

LOAD LIMIT CONTROL

PILOT PUMP

FIXED PUMP

FAN DRIVE PUMP

SMALL ACTUATOR LARGE ACTUATOR

FAN SPEED

VARIABLE PUMP

992G WHEEL LOADER

PILOT RELIEF VALVE




5-22

SLOW TILT


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

RIDE CONTROL

LOWER

PILOT ON/OFF VALVE



DUMP

DUMP

RAISE

FAN SPEED

PRESSURE CUTOFF COOLER

SHUTTLE VALVE

FLUID SAMPLING PORT

LOAD LIMIT CONTROL

PILOT PUMP

FAN DRIVE PUMP


FIXED PUMP

VARIABLE PUMP

992G WHEEL LOADER

FAN MOTOR

PILOT RELIEF VALVE



Page: 5-23

IMPLEMENT HYDRAULIC SYSTEM FAST TILT


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

RIDE CONTROL

LOWER

PILOT ON/OFF VALVE



DUMP

DUMP

PRESSURE CUTOFF

COOLER

SHUTTLE VALVE

LOAD LIMIT CONTROL

PILOT PUMP

FIXED PUMP

FAN DRIVE PUMP


FAN SPEED

VARIABLE PUMP

992G WHEEL LOADER

FAN MOTOR

PILOT RELIEF VALVE

FLUID SAMPLING PORT

RAISE




5-24

SLOW LOWER


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

LOWER

RIDE CONTROL

PILOT ON/OFF VALVE

RAISE


DUMP

DUMP

RAISE

PRESSURE CUTOFF

COOLER SHUTTLE VALVE

FLUID SAMPLING PORT

LOAD LIMIT CONTROL

PILOT PUMP

FIXED PUMP

FAN DRIVE PUMP


FAN SPEED

VARIABLE PUMP

992G WHEEL LOADER

FAN MOTOR

PILOT RELIEF VALVE



FLOAT SEQUENCE VALVE


5-25

FAST LOWER


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

LOWER

RIDE CONTROL

PILOT ON/OFF VALVE



DUMP

DUMP

RAISE

FAN MOTOR PRESSURE CUTOFF SHUTTLE VALVE

FLUID SAMPLING PORT

LOAD LIMIT CONTROL

PILOT PUMP

COOLER FIXED PUMP

FAN DRIVE PUMP


FAN SPEED

VARIABLE PUMP

992G WHEEL LOADER

PILOT RELIEF VALVE



Page:

IMPLEMENT HYDRAULIC SYSTEM

5-26

FLOAT


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

LOWER

RIDE CONTROL

PILOT ON/OFF VALVE

RAISE


DUMP

DUMP

RAISE

FAN MOTOR

FAN SPEED

PRESSURE CUTOFF COOLER SHUTTLE VALVE

FLUID SAMPLING PORT

LOAD LIMIT CONTROL

PILOT PUMP

FAN DRIVE PUMP


FIXED PUMP

VARIABLE PUMP

992G WHEEL LOADER

PILOT RELIEF VALVE

FLOAT SEQUENCE VALVE



Page: 5-27

FLOAT VALVE PLUG PASSAGE TO SEQUENCE VALVE

FLOAT OFF

FLOAT ON

992G WHEEL LOADER

ORIFICE


TO LIFT CYLINDER ROD END

Page:

IMPLEMENT HYDRAULIC SYSTEM

5-28

LOWER ENGINE OFF


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

LOWER

RIDE CONTROL

PILOT ON/OFF VALVE



DUMP

DUMP

RAISE

PRESSURE CUTOFF


FLUID SAMPLING PORT

PILOT PUMP

FIXED PUMP

FAN DRIVE PUMP

LOAD LIMIT CONTROL SMALL ACTUATOR LARGE ACTUATOR

FAN SPEED

VARIABLE PUMP

992G WHEEL LOADER

FAN MOTOR

PILOT RELIEF VALVE



Page: 5-29

IMPLEMENT HYDRAULIC SYSTEM RIDE CONTROL ON


LIFT CYLINDER

LIFT CYLINDER

TILT CYLINDER

SHUTTLE VALVE

LOWER

TILT

TILT

LOWER

RIDE CONTROL

PILOT ON/OFF VALVE



DUMP

DUMP

RAISE

PRESSURE CUTOFF


FLUID SAMPLING PORT

PILOT PUMP

FIXED PUMP

FAN DRIVE PUMP

LOAD LIMIT CONTROL SMALL ACTUATOR LARGE ACTUATOR

FAN SPEED

VARIABLE PUMP

992G WHEEL LOADER

FAN MOTOR

PILOT RELIEF VALVE



Page: 5-30

FAN DRIVE SYSTEM ENGINE OFF ENGINE ECM

FAN FAN MOTOR

SCREEN

MAKEUP VALVE

TANK

IMPLEMENT HYDRAULIC COOLER

INPUTS TO PROPORTIONAL VALVE: --COOLANT TEMPERATURE SENSOR --STEERING TANK TEMPERATURE SENSOR --IMPLEMENT TANK TEMPERATURE SENSOR --AIR CONDITIONER ON/OFF SWITCH

992G WHEEL LOADER

COMPENSATOR VALVE

OIL COOLER BYPASS VALVE


PROPORTIONAL VALVE

FAN DRIVE PUMP


FAN DRIVE COMPONENTS

SYSTEM PRESSURE TEST PORT

FAN DRIVE PUMP

MARGIN SPOOL ADJUSTMENT

COMPENSATOR VALVE

PRESSURE COMPENSATOR ADJUSTMENT

Page:

5-31

SIGNAL PRESSURE OUTLET

PROPORTIONAL VALVE SOLENOID

SIGNAL PRESSURE TEST PORT

ELECTRO-HYDRAULIC PROPORTIONAL VALVE


INTAKE HOSE

FAN DRIVE MOTOR

Page:

5-32

OUTLET HOSE

CASE DRAIN HOSE


992G COOLER LOCATION

ENGINE

Page:

5-33

Page: 5-34

FAN DRIVE SYSTEM SOLENOID DE-ENERGIZED PUMP UPSTROKES

FAN FAN MOTOR

SCREEN

MAKEUP VALVE

TANK


992G WHEEL LOADER

COMPENSATOR VALVE



PROPORTIONAL VALVE

FAN DRIVE PUMP

Page: 5-35

FAN DRIVE SYSTEM SOLENOID ENERGIZED

FAN FAN MOTOR

SCREEN

MAKEUP VALVE

TANK



992G WHEEL LOADER

COMPENSATOR VALVE


PROPORTIONAL VALVE

FAN DRIVE PUMP

Page: 5-36

FAN DRIVE SYSTEM RAPID ENGINE DECELERATION

FAN FAN MOTOR

SCREEN

MAKEUP VALVE

TANK


992G WHEEL LOADER

COMPENSATOR VALVE



PROPORTIONAL VALVE

FAN DRIVE PUMP


6 7

5

1 3 8

4 2

1- HYDRAULIC CONTROL LEVERS 2- TILT LEVER POSITION SENSOR 3- HORN 4- RIGHT ARMREST CONTROL LEVER 5- REDUCED RIMPULL SWITCH 6- THROTTLE LOCK SET SWITCH 7- IMPLEMENT HYDRAULIC LOCK SWITCH 8- CONTROL LEVER COVER - DETENT SOLENOIDS (UNDER COVER)

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5-37


SETTING BUCKET KICKOUTS TO SET KICK-OUTS PRESS & HOLD UPPER, LOWER OR TILT KICK-OUTS FOR APROXIMATELY ONE SECOND

UPPER KICK-OUT (above mid point)

X/2

X

GOES TO KICK-OUT

GOES TO FLOAT (hits ground)

LOWER KICK-OUT

Page:

5-38


LINKAGE POSITION SENSOR REPLACE 1- REPLACE AND INSTALL SENSOR AS INDICATED IN T&A 2- DIAL “SERV” IN KEYPAD 3- SCROLL (>) TO SET SENSORS, LIFT SENSORS ONLY 4- FOLLOW INSTRUCTION UNTIL TARGET NUMBER APPEARS (%) 5- OK WILL SHUTOFF ENGINE (LEAVE KEY SWITCH ON) 6- ADJUST SENSOR ROTATING SHAFT WITH ROLLER IN CENTRE OF CAM 7 - DUTY CYCLE CAN BE READ ON DISPLAY OR CONNECTING FLUKE TO SENSOR 8- PERFORM CALIBRATION BEFORE PUTTING MACHINE BACK IN SERVICE

LINKAGE POSITION SENSOR CALIBRATION 1- PARKING BRAKE ON 2- RIDE CONTROL SWITCH OFF 3- LOW IDLE 4- HYD OIL TEMP > 30 C 5- PRESS OK UNTIL ALL EVENTS ACKNOWLEDGED 6- ENTER SERV 7- PRESS SCROLL (>) UNTIL LFT LINK SNSR - CAL 8- FOLLOW INSTRUCTIONS Page:

5-39


IMPLEMENT VALVE CALIBRATION CALIBRATES EIGHT PROPORTIONAL SOLENOIDS PERFORM IF FOLLOWING CONDITIONS APPLY: - ONE OR MORE SOLENOIDS REPLACED - SERVICE CODE INDICATES CALIBRATION NEEDED - IMPLEMENT ELECTRONIC MODULE REPLACED

PROCEDURE 1) PKNG BRAKE ON 2) LOW IDLE 3) MACHINE IN WIDE OPEN SPACE 4) HYDRAULIC OIL > 30°C 5) “OK” UNTIL ALL EVENTS ACKNOWLEDGED 6) “SERV” AND SCROLL (>) UNTIL “IMPL VALVE SOL - CAL” APPEARS 7) “OK” TO START.....FOLLOW INSTRUCTIONS ERRORS 1 - SOLENOID ERROR CHECK SOL/CAL/WIRNG

CHECK FOR CODES, CORRECT AND RECALIBRATE

2 - CURRENT ABOVE RANGE

HYDRAULIC PROBLEMS. CHECK IMPLEMENT AND PILOT PUMP PRESSURES. MAKE SURE BUCKET IS

3- CURRENT BELOW RANGE

HYDRAULIC PROBLEMS. CHECK FOR EXCESSIVE CYLINDER DRIFT

4 - LFT LINK SNSR ERR

CHECK FOR CODES, CORRECT AND RECALIBRATE

CHECK SNSR/CAL/WIRNG

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5-40


VARIABLE DISPLACEMENT PUMP TESTS DISSABLES LEFT SIDE OF IMPLEMENT CONTROL VALVE ISOLATES VARIABLE DISPLACEMENT PUMP

PROCEDURE 1) PKNG BRAKE ON 2) XMS NEUTRAL 3) START ENGINE 4) WARM OIL TO 49°C 5) “OK” UNTIL ALL EVENTS ACKNOWLEDGED 6) “SERV” AND SCROLL (>) UNTIL “IMPL RLF - VAR PUMP” APPEARS 7) “OK” TO START.....FOLLOW INSTRUCTIONS 8) EVERY 5 SEC PRESS [<] OR [>] TO SEE SPEC LIST SPECIFICATIONS INDICATED ON MESSAGE DISPLAY ARE UPDATED THROUGH SOFTWARE FILES. COULD BE DIFFERENT TO SPECS IN SERVICE MANUAL. SPECS LISTED: - VARIABLE DISPLACEMENT PUMP CUTOFF - RIGHT VALVE DUMP LINE RELIEF PRESSURE - BUCKET LIFT TIME WITH VARIABLE PUMP ONLY - DOUBLE STALL RPM WITH VARIABLE PUMP ONLY - RIGHT VALVE BACK UP RELIEF SETTING

Page:

5-41


FIXED DISPLACEMENT PUMP TESTS DISSABLES RIGHT SIDE OF IMPLEMENT CONTROL VALVE ISOLATES FIXED DISPLACEMENT PUMP

PROCEDURE 1) PKNG BRAKE ON 2) XMS NEUTRAL 3) START ENGINE 4) WARM OIL TO 49°C 5) “OK” UNTIL ALL EVENTS ACKNOWLEDGED 6) “SERV” AND SCROLL (>) UNTIL IMPL RLF - FIX PUMP APPEARS 7) “OK” TO START.....FOLLOW INSTRUCTIONS 8) EVERY 5 SEC PRESS [<] OR [>] TO SEE SPEC LIST SPECIFICATIONS INDICATED ON MESSAGE DISPLAY ARE UPDATED THROUGH SOFTWARE FILES. COULD BE DIFFERENT TO SPECS IN SERVICE MANUAL. SPECS LISTED: - FIXED DISPLACEMENT PUMP MAIN RELIEF - LEFT VALVE DUMP LINE RELIEF PRESSURE - BUCKET LIFT TIME WITH FIXED PUMP ONLY - DOUBLE STALL RPM WITH FIXED PUMP ONLY - LEFT VALVE TILT LINE RELIEF SETTING - LEFT VALVE LOWER LINE RELIEF SETTING - LEFT VALVE RAISE LINE RELIEF SETTING Page:

5-42


LAB EXERCISES Lab A: Implement Hydraulic Component Identification Quiz Worksheet Directions: Use this worksheet and the notes during the presentation to locate the components on the machine. Component Pilot pump Fan drive pump Pilot relief valve Pilot control lever module Pilot oil filter Pressure reducing valve Main implement pumps Main control valves Main relief valve Variable pump backup relief valve Pilot ON/OFF solenoid valve Hydraulic tank Variable pump torque control solenoid valve Fan drive motor Fan drive speed control valve Lift linkage position sensor Tilt linkage position sensor

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5-43

Location on the Machine


LAB EXERCISES Lab B: Implement Hydraulic System Tests Worksheet 1 SENR1367

Following the procedures in the 992G Wheel Loader Hydraulic Systems Testing and Adjusting Module (Form SENR1367), perform the following tests:

1. Page 43

1. Operational Checks

2. Page 44

2. Release of Pressure in Implement Hydraulic System

3. Page 45

3. Fixed Displacement Pump Test

4. Page 46

4. Variable Displacement Pump Test

5. Pilot System - Page 55 - Page 56 - Page 56

5. Pilot System Pressure Test - Pilot Relief Valve Adjustment - Pilot Pressure Supply with Engine OFF - Pilot Control Valve Chamber Pressure Check

6. Main System - Page 58 - Page 61 - Page 63 - Page 65 - Page 68 - Page 70 - Page 72, 89 - Page 73 - Page 77 - Page 91 - Page 92

6. Main System Pressure Tests - Fixed Displacement Pump Main Relief Valve Pressure Test - Left Valve Dump Line Relief Valve Test - Left Valve Tilt Back Line Relief Valve Test - Left Valve Raise Line Relief Valve Test - Left Valve Lower Line Relief Valve Test - Variable Displacement Pump Cutoff Valve Pressure Test - Torque Convertor Stall and Double Stall Test - Variable Displacement Pump Backup Relief Valve Pressure Test - Right Valve Dump Line Relief Valve Test - Fan Drive Pump Cutoff Pressure Test - Fan Drive Pump Margin Pressure Test

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5-44


LAB EXERCISES Lab B: Implement Hydraulic System Tests Worksheet PILOT SYSTEM PRESSURE TEST Pilot Relief Valve

Pilot Pressure Engine Pilot Control Valve OFF Chamber Pressure

Specifications Machine Pressure FIXED DISPLACEMENT PUMP Case Drain Flow

Main Relief Valve Specifications Machine Pressure LEFT VALVE GROUP Dump Line Relief Valve

Tilt Back Line Relief Valve

Raise Line Relief Valve

Lower Line Relief Valve

Specifications Machine Pressure

Specifications Machine Pressure VARIABLE DISPLACEMENT PUMP Back up Relief Valve

Cutoff Valve Specifications Machine Pressure RIGHT VALVE GROUP Dump Line Relief Valve Specifications Machine Pressure

Page:

5-45

TORQUE CONVERTOR Stall

Double Stall

992 G Wheel Loader 5IMPLEM

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