GASKET KT-TC 6V6392 - Caterpillar

Illustration 1 g00928867
Location of fan drive pump (1) Fan drive pump (2) High pressure cutoff valve (3) Signal hose for the reducing valve (4) Displacement solenoid (5) Pump for the steering system (6) Current adjustment screw (7) Stop screw (minimum angle) (8) Pressure and flow compensator valveFan drive pump (1) is part of a double piston pump group. The steering piston pump is the other part of the pump group. Both pumps are variable displacement pumps. A charging pump is located between the fan drive pump and the steering pump. The charging pump is used to keep both pumps supplied with oil. Fan drive pump (1) is located at the front bottom section of the pump drive. The pump drive is located on the right hand frame rail near the rear of the flywheel housing. The Brake/Cooling ECM controls the flow of oil from the fan drive pump by energizing displacement solenoid (4) .The Brake/Cooling ECM will analyze the sensor inputs for the temperatures, the status of the brakes and the ground speed. The Brake/Cooling ECM will send 0 to 680 milliampere to the solenoid. At 0 milliampere, the pump is at the maximum displacement and the fan speed is at maximum speed. At 680 milliampere, the pump is at the minimum displacement and the fan speed is at minimum speed.Displacement solenoid (4) moves a spool in pressure and flow compensator valve (8) in order to control the flow of pump output pressure to the actuator piston (minimum angle). The actuator piston (minimum angle) will move the swashplate to the position of minimum flow. Current adjustment screw (6) controls the minimum current that is required to start destroking the pump.Note: Never adjust the current adjustment screw in chassis. This adjustment should be performed on a hydraulic test stand.High pressure cutoff valve (2) controls the maximum pressure in the fan drive system. The high pressure cutoff valve (2) controls the system pressure by controlling the flow of pump output pressure to the actuator piston (minimum angle). When the system pressure is at the maximum, high pressure cutoff valve (2) will send oil to the actuator piston (minimum angle). The actuator piston (minimum angle) will move the swashplate to the position of minimum flow.Stop screw (minimum angle) (7) is located near pressure and flow compensator valve (8). The stop screw (maximum angle) is located on the other side of the pump.At zero pressure, the spring on the actuator piston will hold the pump at the maximum angle. A reducing valve provides a signal pressure through hose (3) and a shuttle valve to the fan drive pump (1) and the brake cooling drive pump. The fan drive pump (1) needs the signal pressure so that displacement solenoid (4) can position fan drive pump (1) at the minimum angle at start-up and during cold temperatures. Without having the signal pressure, the pump could not stay at the minimum angle in order to provide zero fan speed at start-up and during cold temperatures.
Illustration