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| Illustration 1 | g00938312 |
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(1) Reaction hub
(2) Second reduction ring gear (3) Final drive adapter housing (4) Second reduction carrier (5) Wheel (6) Inner thrust washer (7) Second reduction planetary gear (8) Spindle (9) Second reduction sun gear (10) Axle shaft (11) Outer thrust washer (12) First reduction sun gear (13) First reduction carrier (14) First reduction ring gear (15) First reduction planetary gear | |
Both final drives on the machine have the same components. The operation of the final drives is identical. The final drives have a double reduction to reduce the output speed of the axle. The double reduction also increases the torque to the wheels.
Spindle (8) is fastened to the rear axle housing. The rear axle housing is stationary. Reaction hub (1) is splined to spindle (8) and to first reduction ring gear (14). First reduction ring gear (14) is splined to second reduction ring gear (2). These ring gears are attached to spindle (8) through reaction hub (1). Spindle (8) is held stationary by the rear axle housing.
Power from the differential is mechanically transmitted through axle shaft (10). Axle shaft (10) is splined to first reduction sun gear (12). Since first reduction ring gear (14) does not move, first reduction planetary gears (15) and first reduction carrier (13) rotate. This causes the power from axle shaft (10) to be output at a reduced speed and at an increased torque. First reduction carrier (13) is splined directly to second reduction sun gear (9). Since second reduction ring gear (2) does not move, second reduction sun gear (9) causes second reduction planetary gears (7) and second reduction carrier (4) to rotate. This causes the power from first reduction carrier (13) to be output at a reduced speed and at an increased torque. This power is transferred through final drive adapter housing (3) and through the split ring adapter. This will rotate wheel (5). The power from axle shaft (10) has been reduced in speed twice by the final drive. The final drive has also increased torque twice. Therefore, the power that flows through the final drive remains constant.
During normal operation, the final drives receive lubrication oil from the rear axle oil gear pump. The final drive is also lubricated by the rotation of the gears in the oil. The differential and the final drives use the same lubricant.
Note: For information on final drive bearing adjustment, refer to the Power Train Disassembly and Assembly, "Final Drive - Assemble".