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 TM 55-1905-217-34
drive pins in the reverse gear housing (1, figure 3-89) as follows:
1. Support the reverse gear housing on wood blocks, with the rear face of the housing
down.
2. Note the scribe marks placed on the gear housing at the time the old pins (16) were
removed. Start a new drive pin (16) in each of the drive pin holes in the forward face of the gear
housing, with the square head of the drive pin in line with the scribe mark.
3. With a soft (lead) hammer, drive the pins straight into the gear housing until the
head of the pins contact the surface of the gear housing.
NOTE
The sides of the pins must aline with the scribe marks. If a pin has twisted slightly out of
line when installing, line it up with a wrench.
4. Place the reverse clutch piston (17), without the seal ring, down over the drive pins
to assure the heads of the pins will engage the slots in the piston without binding. Then,
remove the piston from the reverse gear housing.
(b) If removed, install the oil transfer sleeve (8) in the reverse gear housing as follows:
1. Support the reverse gear housing on the bed of a hydraulic press with the forward
face of the housing up.
2. Lubricate the outside of the oil transfer sleeve with engine oil.
3. Start the oil transfer sleeve straight into the bore of the gear housing. Then, place a
wood block on top of the sleeve and under the ram of the press.
4. Bring the ram of the press down on the wood block and press the sleeve straight
into the gear housing until the flange on the sleeve contacts the housing.
(c) Remove the reverse gear housing from the hydraulic press and support the housing
(forward face down) on wood blocks approximately 6 inches high.
(d) Place the bronze thrust washer (fig. 3- 91) over the aft end of the shaft with the wide flat
face of the washer next to the bronze thrust washer. Install the snap ring in the groove in the shaft, then
slide the steel thrust washer back over the snap ring.
(e) Apply a small amount of cup grease in each of the oil seal ring grooves in the reverse gear
drive shaft. Then, slip the oil seal rings, in turn, over the end of the shaft and into the grooves in the
shaft as shown in figure 3-91. Hook the ends of the oil seal rings together.
CAUTION
Do not spread the seal rings more than necessary to slip them over the shaft, to
avoid breakage.
(f) With the reverse gear housing resting on the wood blocks, insert the forward end of the
reverse gear drive shaft through the opening in the aft side of the gear housing and start it straight into
the oil transfer sleeve. Lower the drive shaft through the oil transfer sleeve until the first oil seal ring
contacts the oil transfer sleeve. Carefully work the shaft through the sleeve until all three seal rings are
piloted into the sleeve and the thrust washer bears against the sleeve and gear housing, see figure 3-66.
CAUTION
Use care when installing the reverse gear drive shaft to avoid breaking the oil seal
rings.
(g) Attach the reverse gear housings to the reverse gear adapter plate as follows:
1. Support the reverse gear housings (forward face down) on three wood blocks ap-
proximately 6 inches high, with the top of each housing facing the same direction.
NOTE
The three wood blocks should all be the same thickness, so the housings will be level.
2. Place a new gasket over the attaching bolts in the rear face of each reverse gear
housing.
3. Position the reverse gear adapter plate over the top-of the reverse gear housings,
with the flat smooth side of the adapter plate facing the reverse gear housings, and the top of
the plate facing the top of the housings.
4. Lower the adapter plate straight over the attaching bolts in both reverse gear
housing and against the gaskets.
5. Install the elastic stop nuts and draw the adapter plate down tight against the housings.
Tighten the nuts to 83-93 ft-lb torque.
(h) Raise the reverse gear housings and adapter plate up into a near vertical position. Place
wood blocks under the aft end of each reverse gear drive shaft to support the assembly in this position.
NOTE
With the wood blocks in place, the top of the assembly should tilt back at approximately a
50 angle. This will prevent the assembly from tipping over forward.
(i) Place the seal ring expander (15, fig. 3-88) in the seal ring groove of the reverse gear
housing; then, starting at approximate center of the expander, feed the thick lip of the seal ring
3-130
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