HARNESS AS-CAB 3508249 - Caterpillar

Illustration 1 g00317783
(1) Pump drive (2) Hoist and rear brake cooling gear pump (front section) (3) Hoist and rear brake cooling gear pump (rear section) (4) Inlet from the hydraulic tank (5) Inlet from the hydraulic tank (6) Outlet to the hoist control valve (7) Outlet to the hoist control valveThe hoist and rear brake cooling gear pump is a two-section gear pump. The front section (2) is rated at 390 L/min (103 US gpm). Oil from the torque converter, hoist, and brake section of the hydraulic tank flows through line (4) to the pump inlet. Pump section (2) then pumps oil through line (6) to a screen. The oil goes from the screen to the hoist control valve.The rear section (3) of the pump is also rated at 390 L/min (103 US gpm). Oil from the torque converter, hoist, and brake section of the hydraulic tank flows through line (5) to the pump inlet. Pump section (3) then pumps oil through line (7) to a screen. The oil goes from the screen to the hoist control valve. The oil from pump section (2) combines with the oil from pump section (3) in the hoist control valve. The hoist control valve will send pump oil to one of two locations. When the dump body or OEM attachment is being raised or lowered, the hoist cylinders receive the oil. If the hoist is not being used, the oil flows to the oil cooling system for the rear brakes.