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 TM 55-1905-217-34
(b) Support the forward clutch drive plate with lifting hook and a chain hoist to prevent the plate
from falling.
(c) Remove the two remaining bolts (11) and lock washers, and lift the drive plate away from
the flywheel. Use care when removing the plate not to lose the sixteen clutch release springs
(10) in the forward face of the drive plate.
(d) Remove the sixteen clutch release springs from the clutch drive plate. Also, remove the
forward clutch plate assembly (4) from the flywheel.
(e) Loosen the six self-locking bolts (22) securing the flywheel to the engine crankshaft. Then,
remove the bolts and pilot bearing retainer (23).
(f) Attach flywheel lifting tool to the flywheel with two 7/16 inch-14 bolts of suitable length.
Then, attach a chain hoist to the lifting tool to support the flywheel.
(g) Move the upper end of the tool in and out to loosen the flywheel, then withdraw the flywheel
from the crankshaft and the flywheel housing.
(h) Support the flywheel on two wood blocks, with the ring gear side of the flywheel facing up.
(i) Remove the three emergency engagement bolts (24) with jam nuts from the flywheel.
NOTE
On the flywheel assembly that incorporates six emergency engagement bolts, it is only
necessary to remove three of the bolts (every other one}.
(j) Stand the flywheel up on edge with a thin strip of wood under the rear edge to prevent it from
tipping over.
(k) Thread a 1/2 inch-13 x 2 1/4 inch bolt with long thread into each of the emergency
engagement bolt holes until they contact the forward clutch piston (8).
(l) While supporting the flywheel and piston, continue to turn the bolts in EVENLY until the
peripher of the piston with seal ring is free of the flywheel. Then, lift the piston away from the flywheel.
CAUTION
The piston must be forced EVENLY out of the flywheel to prevent damage occurring
to the seal rings in the piston and the flywheel.
(m) Remove the three 1/2 inch-13 x 2 1/4 inch bolts from the flywheel that were used to remove
the piston from the flywheel. Then support the flywheel on two wood blocks, with the ring gear side of
the flywheel facing down.
(n) Remove the pilot bearing from the flywheel with remover adapter J 5901-2 and slide
hammer.
(o) Inspect the lip of the drive shaft pilot bearing oil seal (20) for nicks, roughness and charring.
If inspection reveals the oil seal is unfit for further use, remove it as follows:
1. Remove the oil seal retaining ring (19) from the back side of the oil seal in the
flywheel, with a pair of small-nose pliers.
2. Place the oil seal remover J 4700 on top of the oil seal. Then drive the oil seal out
of the flywheel with a hammer.
(p) Remove the special plug (14) in the periphery of the flywheel retaining the forward clutch
dump valve and spring in the flywheel. Then, remove she dump valve and spring from the flywheel.
(q) Insert a small screw driver beneath the forward clutch piston inner seal ring (6) in the
flywheel and work the seal ring out of its groove. Then, remove the seal ring and seal ring expander (7)
from the groove in the flywheel.
(r) Remove the outer seal ring and the seal ring expander from the forward clutch piston in the
same manner as described in step (17).
(s) If the forward clutch piston drive pins (9) in the inner face of the flywheel are damaged or
worn excessively, they should be removed as outlined below:
1. Place a scribe mark along one side of each clutch drive pin on the flywheel to use
as a guide when replacing the drive pins.
2. Remove the drive pins with a drift and hammer through the holes provided in the
forward face.
d. Cleaning, Inspection, and Repair.
(1) Wash all of the reverse gear and flywheel parts in cleaning solvent (FED. SPEC. PD-680), blow dry
with compressed air, then inspect.
(2) If the splines on the drive shaft are worn or peened excessively, they should be replaced.
(3) If the facings of the forward and reverse clutch plates show signs of over-heating or worn excessively,
they should be replaced.
(4) If the splines in the hub of the forward clutch plate are excessively worn or peened, it should be
replaced.
(5) If the clutch facing (friction) surface of the reverse and forward pistons and their respective drive
plates are scratched, worn or show signs of overheating, they should be replaced.
(6) If the slots for the drive pins in the back side of the pistons show excessive wear, the pistons and drive
pins should be replaced.
(7) Examine the forward and reverse clutch piston seal rings for cuts and scratches. If cuts, scratches or
any deformity is found on the seal rings, they must be replaced.
(8) If the forward clutch piston type dump
3-127
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