IMPELLER 9Y5068 - Caterpillar

Illustration 1 g03343327
(1) Implement pump
(2) Implement valve without ride control
(3) Implement valve with ride control
(4) Auxiliary implement valve (3rd Function)
(5) Margin pressure relief valve
(6) Pilot pressure solenoid
(7) Tilt (dump) relief valve
(8) Tilt (rack back) relief valve
(9) Auxiliary relief valve
(10) Ride control relief valve
(11) Ride control pressure limiting valve
(12) Implement control solenoid valve
(13) Ride control activation solenoid valve
(14) Ride control On/Off solenoid valve
(15) Load sense relief valve
(16) Pressure reducing valve
(17) Pilot pressure check valve
(18) Pilot accumulator
(19) Ride control accumulator
(20) Manual lower valve
(21) Lift cylinders
(22) Standard tilt cylinders
(23) High lift tilt cylinders
(24) Backpressure orifice plate
(25) Breaker relief valve
(26) Hydraulic tank
(27) Return ScreenThe electrohydraulic system is composed of the following systems:
Implement electronic control system
Pilot hydraulic system
Main hydraulic system
Ride control system
Kickout systemThe hydraulic tank is common to all of the systems.The implement electronic control system is made up of the following components:
Solenoid valve (hydraulic lockout)
Solenoid valves (pilot proportioning)
Implement piston pump
Implement ECM
Control levers or joystick control
Switches
SensorsReference: For additional information about the implement electronic control system, refer to the Service Manual module Systems Operation, "Implement Electronic Control System" for the machine that is being serviced.The pilot hydraulic system is made up of the following components:
Solenoid valve (hydraulic lockout)
Solenoid valve (pilot proportioning)
Pilot oil accumulator
Pressure reducing valve
Switch (hydraulic lockout)The main hydraulic system is made up of the following components:
Main control valve
Tilt cylinder
Lift cylinders
Load sensing signal relief valve
Implement piston pumpReference: For additional information about the main control valve, refer to the Service Manual module Systems Operation, "Main Control Valve" for the machine that is being serviced.The ride control system is made up of the following components:
Lift cylinders
Ride control valve
Ride control accumulator
Power train ECMReference: For additional information about the ride control system, refer to the Service Manual module Systems Operation, "Ride Control System" for the machine that is being serviced.The kickout system is made up of the following components:
Pressure reducing valve
Implement ECM
Control levers or joystick control
Lift linkage position sensor
Tilt linkage position sensorThe implement piston pump is located under the cab. The pump is mounted to the torque converter housing.The hydraulic tank is located on the right side of the machine.The ride control system provides a means for dampening the bucket forces which produce a pitching motion as the machine travels over rough terrain.Reference: For additional information on the operation of the ride control system, refer to Systems Operation, "Ride Control System" for the machine that is being serviced.The manual valve (dead engine lower) is located in front of the articulation joint. The manual valve is used in order to lower the lift arms when there is an electrical failure.The implement ECM is located in the cab behind the operator seat.The implement piston pump provides pump supply oil to the main control valve . A pressure tap for measuring implement pressure is located in the pump bay, near the steering pilot tap.The implement piston pump also supplies pilot oil pressure to the pilot system. A pressure tap for measuring pilot pressure is in front of the articulation joint on the right side of the machine.The main control valve is mounted