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| Illustration 1 | g00294901 |
Fan Drive Motor (1) Outlet port. (2) Fan drive motor. (3) Relief valve. (4) Inlet port. (5) Case drain. | |
Fan drive motor (2) is located at the rear of the machine. Fan drive motor (2) is a gear type motor. The fan drive motor turns a fan that cools the hydraulic oil in the hydraulic oil cooler. The fan drive motor also cools the engine coolant in the radiator.
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| Illustration 2 | g00295212 |
Schematic of the Fan Drive Motor (1) Outlet port to the hydraulic oil cooler. (2) Fan drive motor. (3) Relief valve. (4) Inlet port from the fan drive pump. (5) Case drain line to the hydraulic oil tank. (6) Check valve. | |
Pressure oil from the fan drive pump flows into inlet port (4). The pressurized oil causes gears to mesh within the body of the motor. The pressurized oil causes the motor shaft to rotate. The oil exits fan drive motor (2) through outlet port (1) .
Relief valve (3) is located within the housing of fan drive motor (2). Relief valve (3) allows excess oil to flow to the hydraulic oil tank. Relief valve (3) opens if the pressure of the oil in the fan drive motor exceeds approximately 13000 kPa (1885 psi).
Check valve (6) allows the reverse flow of oil through fan drive motor (2). If the pressure at outlet port (1) is higher than the pressure at inlet port (4), oil will flow through check valve (6) .
Fan drive motor (2) rotates at approximately 1250 rpm when the engine speed is 2200 rpm. When the engine speed exceeds 2200 rpm, the fan drive pump supplies a higher oil pressure to the fan drive motor. If the oil pressure exceeds the pressure setting of relief valve (3), relief valve (3) opens. The oil that flows through relief valve (3) exits at outlet port (1) .
Reference: For additional information about the specifications for the fan drive motor, refer to the Service Manual module for Specifications, "Gear Pump (Fan Drive)" for the machine that is being tested.
Reference: For additional information about testing and adjusting the fan drive motor, refer to the Service Manual module for Testing and Adjusting, "Fan Drive Speed - Test and Adjust" for the machine that is being tested.