TM 5-3820-239-15
from stud (33). Remove rotary valve
worm wheel bearing (57) from
sprocket shaft (56).
(34).
(8) Only if worn or damaged, press rota-
Remove worm wheel (54) and worm
(18)
ry valve bushing (36) out of cylinder
wheel key (55) from sprocket shaft
case (96), through the exhause cover
(56).
opening.
Remove lubrication fittings (46)
(19)
from idler wheel shafts (47). Press
Note. Cylinder liner key (35) is per-
out the idler wheel shafts from idler
manently installed in the cylinder case to
locate and align the rotary valve bushing
wheel bushings (49) and worm hous-
(36). Do not attempt to remove the key.
ing (71). Remove idler wheels (48)
and the idler wheel bushings. Press
Remove cylinder liner caps (39) from
(9)
the bushings out of the idler wheels.
cylinder case (96).
Remove screws (76), lock washers
(20)
Remove screws (41), lock washers
(10)
(77), and crank shaft cap (78).
(42), and housing cap (43) with
Using a suitable bearing puller, re-
(21)
housing cap shim (44).
move crank pinion parts, consisting of
Remove worm shaft grease seal (62).
(11)
crank pinion (73), lower crank bear-
Using a suitable puller, remove the
(12)
ing (75), and Woodruff key (74),
assembled worm shaft (63), with in-
from lower throw crank (90).
Rotate the crank assembly until one
69), long and short worm spacers
(22)
piston (82) is at the end of its stroke,
(66 and 68), worm key (67), and
farthest out of cylinder liner (80).
worm (66).
Raise the crank assembly to free the
(23)
Note. Rotate worm shaft (63) to free
piston from the cylinder liner. When
worm (66) from worm wheel (54).
the piston is free from the liner, move
Using a suitable bearing puller to
(13)
the crank sideways to free the other
bear on the inner races, remove inner
piston on the same throw crank (89
worm bearing (64) and outer worm
or 90) from its cylinder liner (80).
bearing (69) from worm shaft (63).
Free the other two pistons (82) from
(24)
Remove other parts from the worm
their cylinder liners (80) in the same
shaft.
manner as in step (23).
Cut or straighten the ends and re-
(14)
Drive out crank pins (85) from crank
(25)
move c o t t e r p i n s ( 5 0 ) . R e m o v e
center piece (95), and upper and low-
sprocket shaft nuts (51) and sprock-
er throw cranks (89 and 90). Cut or
et shaft washers (52).
straighten the ends and remove cotter
Using a suitable press, bear on the
(15)
pin (86). Remove castellated nut
sprocket end of sprocket shaft (56),
(87) and pinch bolt (88), securing
until sprocket (59) and sprocket key
the halves of crank center piece (95).
(58) are freed and can be removed
Insert the pinch bolt from the oppo-
from the opening in the side of worm
site side to spread crank center piece
housing (71).
(96) and pull out upper throw crank
Using a suitable press, remove
(16)
(89) and lower throw crank (90)
sprocket shaft (56) with assembled
with attached parts.
parts, from worm housing (71). Re-
move sprocket shaft gear seal (60)
Note. Upper and lower throw cranks
and sprocket spacer (61) from the
(89 and 90) and crank center piece (95)
are matched parts and must not be inter-
sprocket shaft.
mixed.
Using a suitable bearing puller to
(17)
bear on the inner races, remove outer
Tap out piston wrist pins (81), and
(26)
6-5