WASHER 6D0740 - Caterpillar

Illustration 1 g00786662
Piston Pump (Hydraulic Fan) that is mounted to the EngineThe hydraulic fan pump is located on the right side of the machine. The hydraulic fan pump is installed to the front housing of the engine.The hydraulic fan pump is a variable displacement piston pump that is driven by the drive gears in the front cover of the engine.
Illustration 2 g00669991
Piston Pump (Hydraulic Fan) (1) Housing. (2) Bias spring. (3) Actuator piston. (4) Piston. (5) Drive shaft. (6) Swashplate. (7) Retraction plate. (8) Cylinder barrel. (9) Valve plate. (10) Head.The pump is a variable displacement piston pump that is used in order to supply the oil flow to the hydraulic fan motor. The movement of pistons (4) in the pump draws oil from the hydraulic tank. Then, the supply oil is sent to the hydraulic motor in order to rotate the fan.When drive shaft (5) is rotating, the components that rotate are cylinder barrel (8), nine pistons (4), and retraction plate (7). The components of the pump that remain are fastened to pump housing (1) .As drive shaft (5) rotates, pistons (4) follow the angle of swashplate (6). The angle of the swashplate controls the movement of pistons (4) in cylinder barrel (8). Also, the swashplate determines the amount of oil that is drawn into each cylinder barrel (8). As cylinder barrel (8) rotates, the swashplate angle pushes pistons (4) back into cylinder barrel (8). Pistons (4) will push the oil out of cylinder barrel (8). The oil then flows through the outlet passages of valve plate (9) to the outlet of the pump. Swashplate (6) can be at any angle between the neutral angle and the maximum angle. The neutral angle is perpendicular with drive shaft (5). When swashplate (6) is at the neutral angle, pistons (4) do not move in and out of rotating cylinder barrel (8). Therefore, no oil is drawn into the pump and no oil is pushed out of the pump. The pump has zero displacement.When swashplate (6) is at the maximum angle, pistons (4) move in and out of cylinder barrel (8). The outward movement of pistons (4) allows the maximum amount of oil to be drawn in to cylinder barrel (8), and the pump will produce the maximum flow.The angle of swashplate (6) is controlled by actuator piston (3). The movement of actuator piston (3) is controlled by the flow of oil from the pump control valve to actuator piston (3).
Illustration 3 g00955960
Pump control Valve (11) Flow compensator spool. (12) Orifice. (13) Spring. (14) Adjustment screw. (15) Pressure cutoff spool. (16) Pump discharge port. (17) Passage to the actuator piston. (18) Orifice. (19) Case drain. (20) Spring. (21) Adjustment screw.
Illustration 4 g01028577
Location of the load sensing port on the pump control valveThe pump control valve is the control group on the piston pump. The pump control valve controls the oil flow that is provided by the piston pump. When the control valve receives a controlled signal at the load sensing port, the output of