SUSPENSION GP-REAR 8J8865 - Caterpillar

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(1) Combination ValveThe combination valve is a large valve body mounted to a bracket at the top of the left tractor frame rail, beneath the cab. The valve body contains numerous components for operation of the fan, brake hoist / ejector, and steering systems.
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(2) Hoist / Ejector Pilot Pressure Reducing Valve
(3) Cross-Axle Differential Lock Pressure Reducing Valve
(4) P1/P2 Priority Diverter Valve
(5) Parking Brake Solenoid Valve
(6) Steering Priority Valve
(7) Braking System Pressure Relief Valve
(8) Fan Speed Control Solenoid Valve
(9) Service Brake Accumulator Charge Solenoid Valve
(10) Fan Speed Limiting Diverter Valve
(11) Brake Charge Inverse Shuttle Valve
(12) Check Valve - Steering System
(13) Hand Metering Unit Load Sensing Relief Valve
(14) Steering, Hoist / Ejector Pump Check Valve
(15) Fan, Brake, Hoist / Ejector Pump Check Valve
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(2) Hoist / Ejector Pilot Pressure Reducing Valve
(3) Cross-Axle Differential Lock Pressure Reducing Valve
(4) P1/P2 Priority Diverter Valve
(5) Parking Brake Solenoid Valve
(6) Steering Priority Valve
(7) Braking System Pressure Relief Valve
(8) Fan Speed Control Solenoid Valve
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(9) Service Brake Accumulator Charge Solenoid Valve
(10) Fan Speed Limiting Diverter Valve
(11) Brake Charge Inverse Shuttle Valve
(12) Check Valve - Steering System
(13) Hand Metering Unit Load Sensing Relief Valve
(14) Steering, Hoist / Ejector Pump Check Valve
(15) Fan, Brake, Hoist / Ejector Pump Check ValveMain Control Valve Body Components
Hoist Pilot Pressure Reducing Valve (2)
The hoist pilot pressure reducing valve is installed in the top of the manifold. Pressure reducing valve uses high-pressure supply oil from the fan, brake, and hoist pump and sets the pilot pressure to the hoist control valve. The valve also drains pilot pressure from the system when the machine is shutdown.Cross-Axle Differential Lock Pressure Reducing Valve (3)
The Cross-Axle Differential Lock Pressure Reducing Valve sets the operating pressure for the Cross-Axle Differential system.P1/P2 Priority Diverter Valve (4)
If P1 pressure is greater than load sense pressure from brake charge or demand fan, this valve will shift and provide secondary flow to the P2 circuit.Parking Brake Solenoid Valve (5)
The parking brake control valve is operated by an on/off solenoid. When the operator moves the transmission control out of the park position, the Transmission ECM energizes this solenoid, which directs oil to the parking brake actuator to release the parking brake. When the transmission control is moved back to the park position, the solenoid is de-energized, which drains the actuator oil to tank, to engage the parking brake.Steering Priority Valve (6)
Steering priority valve gives priority oil to the steering system. The steering priority valve directs P2 pump flow to the hoist system unless the operator is steering. If the operator is steering, load sense pressure from the Hand Metering Unit plus spring pressure will shift the spool and direct P2 pump flow to the steering system.Braking System Pressure Relief Valve (7)
Braking relief valve limits the braking system maximum pressure.Fan Speed Control Solenoid Valve (8)
Proportional solenoid valve that controls the speed of the hydraulic demand by the fan by regulating the load signal to P1. If no current is present at the solenoid, the fan motor will be at full pressure and