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| Illustration 1 | g00294899 |
Location of the Fan Drive Pump (1) Fan drive pump. (2) Outlet port. (3) Inlet port. (AA) Pressure tap for the fan drive pump. | |
Fan drive pump (1) is mounted on the right side of the engine toward the rear of the machine. Fan drive pump (1) is a gear pump that is driven by the camshaft gear. The fan drive pump is a fixed displacement pump. The fan drive pump only functions when the engine is in operation.
The rotation of gears within the pump body creates a vacuum which draws oil from the hydraulic oil tank. Oil enters through inlet port (3). The oil then fills a cavity which directs the oil into the leading edge of meshed gears. The pressurized oil then flows out of the pump through outlet port (2) .
From outlet port (2), the oil flows to the fan drive motor. The pressurized oil causes the shaft of the fan drive motor to rotate. This begins the process of cooling the hydraulic oil.
Pressure tap (AA) is available in order to check the pressure of the fan drive system. A relief valve in the fan drive motor controls the maximum pressure in the fan drive system.
Reference: For additional information about the specifications for the fan drive pump, refer to the Service Manual module for the Specifications, "Gear Pump (Fan Drive)" for the machine that is being serviced.
Reference: For additional information on testing and adjusting the fan drive pump, refer to the Service Manual module for the Testing and Adjusting, "Fan Drive Speed - Test and Adjust" for the machine that is being serviced.