course-steering-system-components-power-train-wheel-loader-992g-caterpillar.pdf

- 83 -

STEERING SYSTEM

- 84 STEERING SYSTEM COMPONENTS STEERING PUMP

PILOT PUMP

PILOT PILOT RELIEF FILTER VALVE

DUAL PILOT CHECK VALVE

STEERING PILOT CONTROL VALVE

NEUTRALIZER VALVES

STEERING CONTROL VALVE

PILOT SYSTEM

STEERING AND BRAKE TANK

MAIN HYDRAULIC SYSTEM

STEERING CYLINDERS

COMMON TO MAIN AND PILOT SYSTEMS

- 85 CONTROL LEVER

STEERING HYDRAULIC SYSTEM HOLD

PILOT CONTROL VALVE PILOT PUMP

NEUTRALIZER VALVE

FILTER

PILOT RELIEF VALVE

CHECK VALVE

STEERING PUMP

COOLER

NEUTRALIZER VALVE

DUAL CHECK VALVE

CHECK VALVE CONTROL VALVE

STEERING CYLINDERS TANK

- 86 -

- 87 -

- 88 -

- 89 -

- 90 -

- 91 -

- 92 STEERING PUMP AND COMPENSATOR VALVE ENGINE OFF SWASHPLATE LARGE ACTUATOR PISTON

SMALL ACTUATOR PISTON

NO SIGNAL SMALL ACTUATOR SPRING

PUMP INTAKE MARGIN SPOOL PUMP EXHAUST

TO STEERING CONTROL VALVE PRESSURE CUTOFF SPOOL

- 93 STEERING PUMP AND COMPENSATOR VALVE LOW PRESSURE STANDBY SWASHPLATE LARGE ACTUATOR PISTON NO SIGNAL

SMALL ACTUATOR PISTON

SMALL ACTUATOR SPRING

PUMP INTAKE

PUMP EXHAUST

MARGIN SPOOL

TO STEERING CONTROL VALVE PRESSURE CUTOFF SPOOL

- 94 -

- 95 -

- 96 STEERING CYLINDERS

STEERING SYSTEM


HOLD DIVERTER VALVE

SHUTTLE VALVE LINE RELIEF VALVE

CONTROL SPOOL

SECONDARY RELIEF VALVE

BACKUP RELIEF VALVE

PRESSURE REDUCING VALVE

COMPENSATOR VALVE

SECONDARY PUMP

DUAL CHECK VALVE STEER CONTROL VALVE

PILOT RELIEF VALVE

STEER LEVER

FILTER COOLER SELECTOR VALVE

FLUID SAMPLING PORT

STEERING PUMP

RIGHT LEFT NEUTRALIZER NEUTRALIZER

TANK

PILOT PUMP


STEERING SYSTEM


GRADUAL RIGHT TURN DIVERTER VALVE


CONTROL SPOOL


BACKUP RELIEF VALVE


COMPENSATOR VALVE

SECONDARY PUMP


PILOT RELIEF VALVE

STEER LEVER


FLUID SAMPLING PORT

STEERING PUMP


TANK

PILOT PUMP


STEERING SYSTEM


FULL RIGHT TURN DIVERTER VALVE


CONTROL SPOOL


BACKUP RELIEF VALVE


COMPENSATOR VALVE

SECONDARY PUMP

DUAL CHECK VALVE

PILOT RELIEF VALVE

STEER STEER CONTROL LEVER VALVE FILTER COOLER SELECTOR VALVE

FLUID SAMPLING PORT

STEERING PUMP


TANK

PILOT PUMP

- 99 -


STEERING SYSTEM


GRADUAL RIGHT TURN SECONDARY STEER DIVERTER VALVE


CONTROL SPOOL


BACKUP RELIEF VALVE


COMPENSATOR VALVE

SECONDARY PUMP


PILOT RELIEF VALVE

STEER LEVER


FLUID SAMPLING PORT

STEERING PUMP


TANK

PILOT PUMP

- 101 BRAKE SYSTEM COMPONENTS BRAKE PUMP

BRAKE ACCUMULATORS

REAR SERVICE BRAKES

PARKING BRAKE VALVE

STEERING AND BRAKE TANK

Service Brake Components

PARKING BRAKE

PARKING BRAKE LEVER

MANIFOLD

Parking Brake Components

SERVICE BRAKE PEDALS

SERVICE BRAKE VALVE

FRONT SERVICE BRAKES

Shared by Service and Parking Systems

- 102 BRAKE HYDRAULIC SYSTEM BRAKE VALVE REAR BRAKE ACCUMULATOR FRONT BRAKE ACCUMULATOR

MANIFOLD

MANIFOLD

CHECK VALVE PUMP CHECK VALVE PARKING BRAKE VALVE TANK

PARKING BRAKE

REAR BRAKE

FRONT BRAKE

- 103

- 104 BRAKE PUMP LOW PRESSURE CONTROL PISTON

SPRING

PUMP SERVO VALVE BARREL

CONTROL PISTON PASSAGE

OUTLET PASSAGE

DRIVE SHAFT INLET PASSAGE PISTON ASSEMBLY

SWASHPLATE

- 105

PUMP SERVO VALVE LOW BRAKE SYSTEM PRESSURE

HIGH BRAKE SYSTEM PRESSURE TO CONTROL FROM PUMP OUTLET PISTON

TO CONTROL FROM PUMP OUTLET PISTON ADJUSTMENT BOLT

LOCKNUT PRESSURE COMPENSATOR SPOOL

ADJUSTMENT BOLT

LOCKNUT

PRESSURE COMPENSATOR SPOOL

- 106 BRAKE PUMP HIGH PRESSURE CONTROL PISTON

SPRING

PUMP SERVO VALVE BARREL

CONTROL PISTON PASSAGE

OUTLET PASSAGE

DRIVE SHAFT INLET PASSAGE PISTON ASSEMBLY

SWASHPLATE

- 107

- 108

- 109

- 110

- 111

- 112 BRAKE HYDRAULIC SYSTEM SERVICE BRAKE OFF / PARKING BRAKE ON

BRAKE VALVE

REAR BRAKE ACCUMULATOR FRONT BRAKE ACCUMULATOR

MANIFOLD

MANIFOLD


PARKING BRAKE

REAR BRAKE

FRONT BRAKE

- 113

BRAKE HYDRAULIC SYSTEM SERVICE BRAKE ON / PARKING BRAKE OFF

BRAKE VALVE

REAR BRAKE ACCUMULATOR FRONT BRAKE ACCUMULATOR

MANIFOLD

MANIFOLD


PARKING BRAKE

REAR BRAKE

FRONT BRAKE

- 114 AXLE COOLING SYSTEMS BRAKE

BRAKE

REAR AXLE

AXLE MANIFOLD

AXLE MANIFOLD

FRONT AXLE

COOLER BRAKE

BRAKE

COOLER RELIEF VALVE RELIEF VALVE

REAR PUMP

FRONT PUMP

- 115

POWER TRAIN

- 116 POWER TRAIN COMPONENTS ENGINE

IMPELLER CLUTCH TORQUE CONVERTER

REAR FINAL DRIVE

UPPER DRIVE SHAFT

REAR DRIVE SHAFT

INPUT TRANSFER GEAR

OUTPUT TRANSFER GEAR

TRANSMISSION

FRONT DRIVE SHAFT

FRONT FINAL DRIVE

- 117

- 118

- 119

- 120

- 121

- 122 POWER TRAIN SCHEMATIC PRIORITY VALVE

TRANSMISSION CONTROL VALVE

LUC SOLENOID

IC SOLENOID

LOCKUP CLUTCH

IMPELLER CLUTCH

T/C FILTER

TRANS FILTER

TRANSMISSION TORQUE CONVERTER

PUMP

T/C OUTLET RELIEF VALVE

INPUT TRANSFER GEAR OUTPUT TRANSFER GEAR

COOLER

- 123

- 124

- 125

- 126

- 127

- 128 TRANSMISSION HYDRAULIC CONTROL VALVE MODULATION RELIEF VALVE

FIRST AND THIRD SPEED SELECTOR SPOOL CONVERTER INLET RATIO VALVE DIRECTIONAL SELECTOR SPOOL

LOAD PISTON

PRESSURE DIFFERENTIAL VALVE

SECOND SPEED SELECTOR SPOOL

- 129

- 130 TURBINE

IMPELLER CLUTCH TORQUE CONVERTER

STATOR

HOUSING IMPELLER CLUTCH LOCKUP CLUTCH IMPELLER

- 131

- 132 TEST PORT

BALL

SPRING

VALVE SPOOL

ORIFICE

IMPELLER CLUTCH SOLENOID VALVE SPRING

IMPELLER CLUTCH SOLENOID ENERGIZED SOLENOID

ARMATURE ASSEMBLY

FROM PUMP TO IMPELLER CLUTCH TEST PORT

SPRING

BALL

VALVE SPOOL

ORIFICE

TEST PORT

SOLENOID

ARMATURE ASSEMBLY

SPRING

IMPELLER CLUTCH SOLENOID DE-ENERGIZED FROM PUMP

TO IMPELLER CLUTCH

- 133 TEST PORT

BALL

VALVE SPOOL

ORIFICE

LOCKUP CLUTCH SOLENOID VALVE SPRING

LOCKUP CLUTCH SOLENOID ENERGIZED SOLENOID

PIN

FROM PUMP TO LOCKUP CLUTCH TEST PORT

BALL

VALVE SPOOL

ORIFICE

SPRING

LOCKUP CLUTCH SOLENOID DE-ENERGIZED SOLENOID

PIN

FROM PUMP TO LOCKUP CLUTCH

- 134

- 135

TRANSMISSION HYDRAULIC SYSTEM NEUTRAL

2

3

PRIORITY VALVE 1

5

IMPELLER CLUTCH SOLENOID VALVE

4

LOCKUP CLUTCH SOLENOID VALVE

TRANSMISSION FILTER

3

2

5

TORQUE CONVERTER OUTLET RELIEF VALVE

TORQUE CONVERTER FILTER

1 TORQUE CONVERTER 4 PUMP TRANSMISSION CONTROL VALVE SUMP

TO TRANSMISSION

- 136

TRANSMISSION HYDRAULIC SYSTEM FIRST SPEED FORWARD TORQUE CONVERTER DRIVE

2

3

TEST PORT

PRIORITY VALVE 1

5


4


TRANSMISSION FILTER

3

2

5



1

TORQUE CONVERTER 4 PUMP TRANSMISSION CONTROL VALVE SUMP

TO TRANSMISSION

- 137

TRANSMISSION HYDRAULIC SYSTEM SECOND SPEED FORWARD SPEED SHIFT

2

3

TEST PORT

PRIORITY VALVE 1

5

4



3

2

TRANSMISSION FILTER

5




TO TRANSMISSION

- 138

TRANSMISSION HYDRAULIC SYSTEM SECOND SPEED REVERSE DIRECTION SHIFT

2

3

PRIORITY VALVE 1

5


4


TRANSMISSION FILTER

3

2

5



1

TORQUE CONVERTER 4 PUMP TRANSMISSION CONTROL VALVE SUMP

TO TRANSMISSION

- 139

TRANSMISSION HYDRAULIC SYSTEM SECOND SPEED REVERSE DIRECT DRIVE

2

3

TEST PORT

PRIORITY VALVE 1

5


4


TRANSMISSION FILTER

3

2

5




TO TRANSMISSION

- 140 POWER TRAIN ELECTRICAL SYSTEM POWER TRAIN ECM (MAC-14)

INPUT COMPONENTS STIC UPSHIFT, DOWNSHIFT, FORWARD, NEUTRAL, REVERSE

KEYSWITCH

CAT DATA LINK

CONTROL AND MONITOR SYSTEMS

OUTPUT COMPONENTS

STARTER RELAY REDUCED RIMPULL INDICATOR LAMP

REDUCED RIMPULL ON/OFF SWITCH

CLUTCH 1 REVERSE SOLENOID

REDUCED RIMPULL SELECTION SWITCH

CLUTCH 2 FORWARD SOLENOID

RIDE CONTROL ON/OFF SWITCH PARKING BRAKE LIMIT SWITCH QUICK-SHIFT SWITCH LOCKUP CLUTCH ENABLE SWITCH STEERING/TRANSMISSION LOCKOUT SWITCH TORQUE CONVERTER PEDAL POSITION TORQUE CONVERTER SPEED

CLUTCH 3 3RD GEAR SOLENOID CLUTCH 4 2ND GEAR SOLENOID CLUTCH 5 1ST GEAR SOLENOID

RIDE CONTROL SOLENOID

IMPELLER CLUTCH SOLENOID

LOCKUP CLUTCH SOLENOID

TRANSMISSION SPEED BACKUP ALARM PARKING BRAKE PRESSURE SWITCH

- 141

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course-steering-system-components-power-train-wheel-loader-992g-caterpillar.pdf

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