TM 5-3805-296-10
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POWERTRAIN
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1. General. Power from the engine is sent to the torque converter through a driveshaft and transfer gears. The
torque converter output is connected to the eight-speed powershift transmission. The transmission is con-
nected via the lower drive shaft to the differential in the drive axle. The differential and drive axles provide the
power to the planetary carriers in the left and right final drives.
2. Transmission. The transmission has eight hydraulically activated clutches that provide eight forward speeds
and one reverse speed.
3. Transfer Gear. The transfer drive gear receives power from the transmission output and transfers the power
via a transfer gear and shaft to the drive shaft yoke that is connected to the lower drive shaft.
4. Differential. The differential divides the balance of power that is sent to the final drives and wheels. When the
machine is turning, the differential allows the inside wheel to turn at a slower rate than the outside wheel.
However, the differential still sends the same torque to each wheel.
5. Differential Lock. The differential lock is utilized when maximum traction is needed. The operator engages the
differential lock by pressing down and holding the differential lock switch. This in turn allows air pressure to
engage the lock; when the switch is released, internal springs will disengage the lock. The differential lock
should never be engaged when one tractor wheel is spinning or when operator is turning the machine or
damage to the differential assembly will occur.
6. Final Drive. The planetary final drive causes speed reduction and an increase in torque at the tractor wheels.
Power from the differential turns the axle shafts; the axle shafts turn the sun gear in the center of the planetary
gears. The movement of the planetary gears causes the planetary carrier to turn, turning the wheels.
Figure 2. Final Drive.
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