TM 5-3805-258-24-1
S Y S T E M S
O P E R A T I O N
P O W E R T R A IN
FINAL DRIVES
FINAL DRIVE COMPONENTS
1. Carrier.
4. Cover assembly.
7. Sun gear.
2. Wheel assembly.
5. Spindle housing.
8. Ring gear.
3. Brake group.
6. Planetary gears.
9. Hub.
Each final drive has the same components. A final
drive causes the last speed reduction and torque in-
crease in the power train.
Ring gear (8) is fastened to hub (9). Hub (9) is
connected to spindle housing (5) by splines. Spindle
housing (5) is fastened to the axle housing. Ring gear
(8), spindle housing (5) and hub (9) are held
stationary.
Power from the differential turns the axle shaft.
The axle shaft turns sun gear (7). Sun gear (7) turns
planetary gears (6). Since ring gear (8) is held by hub
(9), the planetary gears move around the inside of
ring gear (8). The movement of the planetary gears
causes planetary carrier (1) to turn. The planetary
carrier is turned in the same direction as sun gear (7)
but at a slower speed. The planetary carrier turns
wheel assembly (2).
The axle shaft is connected to the differential by
Each final drive has its own oil reservoir. Oil is put
splines. Sun gear (7) is connected to the axle shaft by
into the final drive through a fill plug on the outside
splines. Sun gear (7) is engaged with planetary gears
cover. Oil is removed from the final drive through a
(6). Planetary gears (6) are held in planetary carrier
drain plug.
(1). Planetary carrier (1) is fastened to wheel assem-
The components of the final drives get lubrication
bly (2).
from the oil inside the final drives.
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