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| Illustration 1 | g00277986 |
Typical Example (1) Bevel pinion. (2) Bevel gear. (3) Ring gear. (4) Planetary gear. (5) Carrier. (6) Axle shaft. (7) Shaft. (8) Differential case. (9) Pinion. (10) Side gear. (11) Brake piston. (12) Brake disc. (13) Sun gear. | |
The front axle group and the rear axle group incorporate the pinion and bevel gear set, the differential, the final drives, and the disc brakes. The front axle housing and the rear axle housing are slightly different, but the internal components and the operation are identical. A limited slip differential is available in both the front axle group and the rear axle group. A NoSPIN differential is available in the rear axle group.
Power from the transmission output shaft is transferred to the front axle group and to the rear axle group by the drive shafts. The power enters the front axle group and the rear axle group through the bevel pinion (1). Bevel pinion (1) turns bevel gear (2). Bevel gear (2) is fastened to differential case (8) .
Power is transferred through the differential by pinions (9) and by side gears (10) to the final drives. The following components are the main components of the final drives: carrier (5), planetary gears (4), ring gear (3) and sun gear (13). Each final drive has the same components. The final drives cause the last speed reduction and the last torque increase in the drive train.
Sun gear (13) is splined into side gear (10) of the differential. Ring gear (3) is pressed into the axle housing. Three planetary gears (4) are mounted in carrier (5). Carrier (5) has internal splines. The splines of axle shaft (6) fit into the splines of carrier (5) .
As sun gear (13) is driven by the differential, planetary gears are forced to revolve around the inside of ring gear (3). The movement of the planetary gears (4) around ring gear (3) causes carrier (5) and axle shaft (6) to rotate. This transfers power to the rim and the tire. The rim and the tire bolt to the flange on axle shaft (6) .
The front axle group and the rear axle group contain the service brakes. Brake disc (12) is splined to sun gear shaft (13). Brake disc (12) rotates at the same speed as the sun gear. When the brakes are applied, the cavity behind brake piston (11) is pressurized. When the brakes are applied, the brake piston clamps brake disc (12) between the piston and the brake reaction plate.
Reference: For more information about the braking system, refer to Specifications, SENR6791, "938G Wheel Loader and IT38G Toolcarrier Braking System" and refer to Systems Operation, SENR6792, "938G Wheel Loader and IT38G Toolcarrier Braking System".