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 TM 55-1905-217-34
(14) into the groove next to the expander with the narrow lip of the seal ring pointed down into the gear
housing.
(j) Place the reverse clutch piston (17) on a work bench with the drive pin slots in the rear face
of the piston facing up. Place the seal ring expander (18) in the seal ring groove at the periphery of the
piston; then, starting at the approximate center of the expander, feed the thick lip of the seal ring (19) into
the groove next to the expander with the narrow lip of the seal ring facing the side of the piston
incorporating the drive pin slots.
(k) Install the reverse clutch piston (17) in the reverse gear housing as follows:
1. Thread a piston remover tool J 4746 (T-head bolt) into each of the two tapped holes
in the forward face of the reverse clutch piston.
2. Apply a light grade of engine oil to the seal ring in the piston and in the gear
housing.
3. Place the piston over the reverse gear drive shaft, with the slots in the rear face of
the piston in alignment with the drive pins in the gear housing.
4. Start the piston straight into the gear housing, and push the piston uniformly in over
the drive pins using extreme care not to dislodge the seal rings from their grooves.
(1) Check the clearance between the piston seal rings and the reverse gear housing as follows:
1. Insert the end of a .006 inch feeler gage between the lip of the outer seal ring and
the gear housing.
CAUTION
The end and edges of the feeler gage must be smooth and free of nicks or burrs.
2. Carefully slide the feeler gage around between the outer seal ring and the gear
housing and check for any bind on the feeler gage. Then, check the clearance between the
inner seal ring and the gear housing. If a bind occurs, the lip of the seal ring may have turned
up or the piston may not be centrally located.
3. If the lip of either of the seal rings has turned up, remove the piston and install a
new seal ring. Recheck the clearance.
4. If the piston is not centered, tap the face of the piston (opposite the bind) lightly with
a plastic hammer. If the id still exists, remove the piston and turn 120or 240, reinstall the
piston and again check the clearance.
(m) Attach the reverse clutch plate (23) to the reverse ring gear (32) as follows:
1. Place the reverse ring gear on the work bench, with the forward face of the ring gear
down.
2. Place the reverse clutch plate on top of the reverse ring gear.
3. Install the retaining ring (33) in the groove in the top inner diameter of the ring gear.
(n) Install the reverse clutch plate (23) and drive plate (22) in the reverse gear housing as
follows:
1. Thread a piston remover tool J 4746 (T-head bolt) into each of the two tapped holes
in the forward face of the reverse clutch drive plate.
2. Support the reverse clutch drive plate on an angle (rear face of the plate facing up)
with the weight of the plate resting on the tools (T-head bolts).
3. Apply a small amount of cup grease on one end of each reverse clutch release
spring (3). Then, insert the greased end of the springs into the sixteen holes in the rear face of
the drive plate (22).
4. Place the reverse clutch plate and ring gear assembly against the reverse clutch
drive plate, with the ring gear projecting through the center of the drive plate, (fig. 3-93).
3-131
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