CONTROL AR-TRACTION 3843810 - Caterpillar

Illustration 1 g00627373
(1) Pump drive (2) Hoist pump (3) Inlet from the hydraulic tank (4) Outlet to the hoist control valveThe hoist pump is a single-section gear pump.Oil from the hydraulic tank (torque converter, hoist, brake and transmission) flows to hoist pump (2). The pump sends oil to the hoist control valve. The hoist control valve will send pump oil to the hoist or to the oil cooling system for the rear brakes. When the dump body is being raised, the hoist cylinders receive most of the oil. Some of the oil will go to the oil cooling system for the rear brakes. When the dump body is being lowered, all the oil will go to the hoist. If the hoist is not being used, the oil flows to the oil cooling system for the rear brakes.