7080419C91 HOSE ASSY CCV SUPPLY (Reference) Caterpillar parts HOSE
Alternative (cross code) number:
Illustration 1 g00924676
View Under the Cab (1) Implement pump. (2) Power train pump. (A) Case drain line. (B) Inlet line from tank.Oil enters the implement pump from the hydraulic oil tank through inlet line (B). Case drain oil exits the pump through port (A). The case drain oil cools the pump. Also, the case drain oil removes debris from the pump. The case drain oil is filtered by a case drain filter before flowing back to the hydraulic oil tank.Pressure oil flows from the pump through port P1. The oil flows to the implement control valve, the combination valve, the steering metering pump, and the brake charging valve.
Illustration 2 g00924757
Bottom View of the Implement Pump (3) Load sensing valve (standby and margin pressure). (C) Load sensing line.The required output from the implement pump is sensed in load sensing line (C). Load sensing valve (3) controls the upstroking and destroking of the pump in order to match the required flow and required pressure of the system.The load sensing valve compares the output pressure from line (A) to the signal pressure in line (C). The difference between the two pressures is the margin pressure. The load sensing valve can be adjusted in order to control the response of the pump to the pressure and flow requirements of the system.
Illustration 3 g00924903
Schematic of the Implement Pump (3) Load sensing valve. (4) Pressure cutoff valve. (5) Actuator piston. (6) Swashplate. (P1) Pressure line. (U1) Case drain line. (T1) Inlet line from tank. (LS) Load sensing line.When the engine is running and no functions are being used, a low pressure standby condition exists. There are no pressure or flow demands on the implement pump.Before the engine is started, the spring in actuator piston (5) keeps the pump at maximum output. As the pump begins to turn, oil begins to flow and the pressure increases in the system because no oil flows to any hydraulic components.As the pressure in the system increases, load sensing valve (3) moves to the right and oil flows through pressure cutoff valve (4) to the actuator piston. The actuator piston continues to destroke the pump until swashplate (6) is at the minimum angle.When the flow requirement of the system increases, the differential pressure from port (LS) to port (P1) decreases. (The margin pressure decreases.) The force of the spring in load sensing valve (3) plus the oil pressure