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| Illustration 1 | g00317783 |
(1) Pump drive (2) Hoist pump (front section) (3) Pump for rear brake cooling (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 diverter valve | |
The 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 that is located in the hydraulic tank. The hoist control valve will send pump oil to one of two locations. When the dump body 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.
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 diverter valve. The hoist diverter valve sends the oil to one of two locations. When the dump body is being raised, the oil combines with the oil from the front pump section and flows to the hoist cylinders. If the dump body is not used, the oil is diverted to the oil coolers for the rear brakes.