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| Illustration 1 | g00517895 |
Final Drive Components (1) Sun gear shaft. (2) Hub. (3) Hub. (4) Ring gear. (5) Planetary carrier. (6) Spindle housing. (7) Sprocket segments. (8) Planetary gears. | |
The final drive is a modular single reduction planetary gear set with a 8:4 to 1:0 reduction. The final drives cause the last speed reduction. The final drives also cause the torque increase in the power train.
Ring gear (4) is fastened to hub (3) . Hub (3) is connected to spindle housing (6) by splines. Spindle housing (6) is fastened to the steering clutch case. Ring gear (4) , hub (3) and spindle housing (6) are held stationary.
Sun gear shaft (1) is connected to the steering clutch output hub by splines and sun gear shaft (1) is engaged with planetary gears (8) . Planetary gears (8) are held in planetary carrier (5) . The planetary carrier is fastened to sprocket hub (2) .
The power from the steering clutches is sent to the final drive by sun gear shaft (1) . The rotation of sun gear shaft (1) causes planetary gears (8) to turn. Because ring gear (4) is held by hub (3) , planetary gears (8) move around the inside of ring gear (4) .
The movement of the planetary gears causes planetary carrier (5) to turn. The planetary carrier is turned in the same direction as sun gear shaft (1) , but the planetary carrier turns at a slower speed. Planetary carrier (5) turns sprocket hub (2) . Sprocket segments (7) are fastened to the sprocket hub. Sprocket segments (7) drive the track as the sprocket hub turns.
Each final drive has an oil supply. All of the components get lubrication oil as the gears move. Oil is thrown about the housing. This is called splash lubrication.