ENGINE AR 7W8716 - Caterpillar

Illustration 1 g06221343
(1) Tilt cylinder
(2) Hydraulic tank
(3) Implement ECM
(4) Implement pump
(5) Hydraulic oil cooler
(6) Lift cylinder
(7) Ride control accumulator
(8) Main control valve
(9) Implement control joystickThe machine is electrohydraulically controlled. The machine uses hydraulic power that is controlled by electronics to move the actuators. The electrohydraulic system is composed of the following systems: the main hydraulic system, the pilot hydraulic system, the implement electronic control system, the kickout system, and the hydraulic fan system.The hydraulic tank is common to all the systems.The machine is equipped with a proportional priority pressure compensated electrohydraulic implement system. The electrohydraulic system will sense a demand for a flow change and the implement pump will upstroke or destroke to provide the demanded flow. The machine is equipped with a full return flow filtration system. The return oil from the implement valve, and the steering valve, flows through the return oil filter in the hydraulic tank. A new load sense relief/purge valve limits the maximum load signal pressure sent to the implement pump. The load sense relief valve allows a constant purge in the load signal circuit.The implement electronic control system consists of the following components: implement pilot supply solenoid valve,pilot proportioning solenoid valves, implement piston pump, Implement ECM, joystick control and control lever, switches and sensors.The main hydraulic system consists of the following components: implement piston pump, load sensing signal relief valve, main control valve, tilt cylinder, and lift cylinders.The pilot system consists of the following components: the control manifold, pressure reducing valve, hydraulic oil filter, and brake, pilot, fan hydraulic pump. The pilot control actuators are attached to the main control valve.The kickout system consists of the following components: pressure reducing valve, implement ECM, control levers or joystick control, lift cylinder position sensor and tilt cylinder position sensor.The hydraulic fan system is standard on all machines. The hydraulic fan system is an on-demand fan control system. As the need for more cooling arises, the fan system supplies more air flow through the radiator. The output of the hydraulic fan system is used to meet different cooling requirements during high ambient conditions or a light work application. For additional information about the hydraulic fan system, refer to the Systems Operation, "Hydraulic Fan System".The ride control system consists of the following components: lift cylinders, ride control valve, accumulator, and Power Train ECM. The accumulator and a balancing valve will be connected to the lift cylinders. The ride control system is now controlled by the Implement ECM. For additional information about the operation of the ride control system, refer to the Systems Operation, "Ride Control System".