HOSE AS 9R9070 - Caterpillar

Illustration 2 g01456682
Fan pump
(16) Housing of the pump
(17) Actuator piston
(18) Piston
(19) Cylinder barrel
(20) Port plate
(21) Outlet passage to the fan motor
(22) Drive shaft
(23) Swashplate
(24) Piston shoe
(25) Shoe plate
(26) Spring
(27) Actuator piston
(28) Inlet passage from the hydraulic tank
(29) Head Fan pump (13) is a variable displacement piston pump. The fan pump is controlled by a load sensing line that is connected to pump control valve (14). The movement of pistons (18) in the pump draws oil from hydraulic tank (15). Then, pump (13) provides oil flow to hydraulic fan motor (2).When the engine is running and drive shaft (22) is rotating, the components that rotate are cylinder barrel (19), pistons (18), piston shoes (24), and shoe plates (25). Within barrel (19), there are nine piston assemblies (18). The components of the pump that remain are fastened to pump housing (16).Oil from hydraulic tank (15) flows into pump head (29) at inlet passage (28). Then, the oil flows from inlet passage (28) into port plate (20). When drive shaft (22) rotates, the openings in cylinder barrel (19) move toward the passages in port plate (20).Each piston (18) inside cylinder barrel (19) is held against swashplate (23) by shoe plate (25). Swashplate (23) can be at any angle between the maximum angle and the minimum angle. The angle of swashplate (23) determines the displacement of oil that is pushed out of each cylinder barrel (19).As pistons (198) follow the angle of swashplate (23), the pistons move in and out of cylinder barrel (19). When pistons (18) move out of cylinder barrel (19), oil is pulled into cylinder barrel (19). As cylinder barrel (19) rotates, the angle of swashplate (23) pushes pistons (18) into cylinder barrel (19). Then, pistons (18) push oil out of cylinder barrel (19) and oil flows through the outlet passages of port plate (20). The minimum angle is perpendicular with drive shaft (22). The discharge of oil is greater when the angle of swashplate (23) is greater. Oil is discharged through port plate (20) to outlet passage (21).When swashplate (23) is at the maximum angle, the pump is at the maximum displacement.The swashplate angle is controlled by spring (26) and actuator piston (27). Actuator piston (27) is activated by oil pressure from solenoid valve (7).Pressure Control Valve
Illustration 3 g03054162
Hydraulic fan pump (typical example)
(14) Pump control valves
Illustration 4 g01462910
Illustration 5 g02698778
Components of pressure and flow compensator valve
(30) Housing
(31) Spring
(32) Port (load sensing signal)
(33) Actuator piston
(34) Port (load sensing signal)
(35) Port passage for case drain
(36) Actuator pressure
(37) Discharge pressure
(38) Cavity (flow compensator) The flow of oil for the hydraulic fan system is regulated by pump control valve (14). Pump control valve (14) maintains the correct oil flow that is provided by the fan pump. Pump flow and pump pressure cutoff are maintained by either sending or draining actuator piston (33).Actuator piston (33) and spring (31) work against each other in order to determine the angle of swashplate (23). The discharge pressure of the pump is 2100 100 kPa (305 15 psi) above the