them.
The final drive uses the same oil as the transmission.
b. Transmission and Final Drive Interface. The two transmission
trunnions fit into mating saddle assemblies of the final drives. The
left trunnion of the transmission has a locating ring that fits in a
groove in the final drive that positions the transmission in the
vehicle and prevents lateral movement.
Saddle caps bolt on and
secure the transmission trunnions to the final drives.
The
transmission output shafts connect to the final drive through the
splined sun gears, located in each final drive, that slide into
engagement with the drive splines on the transmission output shafts.
This configuration also permits external disengagement from the
transmission for high speed or extensive towing of the vehicle.
The final drive input spline, integral with the sun gear, receives
transmission output torque and transmits it through the planetary
carrier to the final drive output shaft.
The output shaft carries
the torque to the vehicle track sprocket to propel the vehicle. The
gear reduction ratio is 4.30:1 and input and output rotation is in
the same direction.
c. Towing.
As a precaution before towing a vehicle that has a
disabled
transmission,
disconnect
the
final
drives
from
the
transmission to prevent further damage to the unit.
To disconnect
the final drive, remove the cover from the output shaft, remove the
adapter and retainer, install the adapter in the reverse position,
and tighten the bolt that retains the retainer. This will disengage
the drive spline gear from the transmission output shaft.
Figure 1-56.
Final Drive.
This concludes the lesson.
The next item you will perform is a
practice exercise to prepare you for the examination of this lesson.
61
OD1710
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