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| Illustration 1 | g00740094 |
(1) Drive shaft. (2) Pump housing. (A) Inlet. | |
Note: The pilot pump is located behind the cab on the right side of the machine.
Note: The outlet port (not shown) is on the side opposite inlet port (A). Inlet port (A) has a larger diameter than the outlet port.
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| Illustration 2 | g00740116 |
Pump Rotation and Oil Flow (2) Pump housing. (3) Drive gear. (4) Idler gear. (A) Inlet (low pressure). (B) Outlet (high pressure). | |
The pilot pump is a fixed displacement gear pump.
Drive shaft (1) turns drive gear (3), which forces idler gear (4) to turn. A seal is formed by the gears against pump housing (2). As the gears turn, oil enters through inlet port (A). The oil is trapped between the teeth and the pump housing. The oil is pulled around the outside of the gears. The oil is then forced out of outlet port (B).