ENGINE AR-COMPLETE 4480057 - Caterpillar

Illustration 1 g02210974
Typical view
(1) Final drive Each of the two final drives have the same components. A final drive causes the last speed reduction in the power train and the last torque increase in the power train.
Illustration 2 g02415116
Typical view of final drive (1)
( 2) Hub
(3) Ring gear
(4) Sun gear
(5) Planetary carrier
(6) Planetary gears Hub (2) is connected to the spindle housing. Ring gear (3) is fastened to hub (2). Ring gear (3), hub (2), and the spindle housing are stationary.The axle shaft is connected to final drive (1) by splines in sun gear (4). Sun gear (4) is engaged with planetary gears (6). Planetary gears (6) are held in planetary carrier (5). Planetary carrier (5) is connected to the wheel.Power from the differential turns the axle shaft. The axle shaft turns sun gear (4). Sun gear (4) turns planetary gear (6). Because ring gear (3) is held stationary by hub (2), the planetary gears move around the inside of ring gear (3). The movement of the planetary gears will cause planetary carrier (5) to turn. Planetary carrier (5) is turned in the same direction as sun gear (4), but at a slower speed. Planetary carrier (5) drives the wheel.The final drives receive lubrication by the rotation of the gears in the oil. The differential and the final drives use the same lubricant.