HOSE AS 8W0299 - Caterpillar

Illustration 1 g00390577
Final Drive Components
(1) Wheel assembly. (2) Hub. (3) Ring gear. (4) Planetary gears. (5) Sun gear. (6) Spindle housing. (7) Axle shaft. (8) Planetary carrier.
Each final drive has the same components. A final drive provides the last speed reduction and the torque increase in the power train.Ring gear (3) is fastened to hub (2). Hub (2) is connected to spindle housing (6) by splines. Spindle housing (6) is fastened to the axle housing. Ring gear (3), spindle housing (6), and hub (2) are held stationary.Axle shaft (7) is connected to the differential by splines. Sun gear (5) is connected to axle shaft (7) by splines. Sun gear (5) is engaged with planetary gears (4). Planetary gears (4) are held in planetary carrier (8). Planetary carrier (8) is fastened to wheel assembly (1).Power from the differential turns axle shaft (7). Axle shaft (7) turns sun gear (5). Sun gear (5) turns planetary gear (4). Because ring gear (3) is held by hub (2), the planetary gears move around the inside of ring gear (3). The movement of the planetary gears cause planetary carrier (8) to turn. The planetary carrier is turned in the same direction as sun gear (5) but at a slower speed. The planetary carrier turns wheel assembly (1).Each final drive has an oil reservoir. Oil is added to the final drive through a filler plug on the outside cover. Oil is removed from the final drive through a drain plug.The components of the final drives are lubricated from the oil that is inside of the final drives. The oil in the final drives is the same oil that is in the differentials.