TM 5-3820-239-15
1 Magnetic plug, 5/8 in.
21 Washer, lock 5/16 iin. (4)
2 Gasket
23 Thrust plate
3 Feed motor bushing
24 Upper bearing cap
4 Street elbow, 45 x 3/4 in.
5 Elbow, 45 x 3/4 in.
25 Upper bearing spring
6 Nipple, 3/4 x 2 in.
26 Lubrication fitting, 1/8 in.
2 7 Screw, hex-, 5/16-24 x 3/4 in. (8)
7 Manifold bolt, hex-hd, No. 12-24 x 1 3/4 in. (5)
8 Washer, lock, No. 12 (5)
28 Washer, lock, 5/16 in. (8)
9 Motor air manifold
29 Gear case
10 Seal ring (2)
30 Nut, self-locking, hex, 3/8-24 (4)
1 1 Live air stud screw
31 Drive gear
1 2 Washer, lock
32 Thrust bewaring
Reverse valve hold stud pin
33 Bearing stud
13
1 4 Reverse valve hole stud
34 Rotary valve
1 5 Live air stud
3 5 Cylinder liner key
16 Screw, cap, sq-hd, 5/8-11 x 2 1/2 in. (4)
36 Rotary valve bushiong
1 7 Nut, hex, 5/8-11 (4)
37 Grease plug
1 8 Washer, lock, 5/8 in. (4)
38 Grease plug washer
19 Worm housing clamp (2)
39 Cylinder liner cap (4)
20 Screw, cap, hex-hd, 5/16-24 x 3/4 in. (4)
k . I n s p e c t r o t a r y v a l v e b u s h i n g (36),
nicks, burrs, and elongated pin holes. Remove
sprocket and worm spacers (61, 65, and 68),
minor nicks and burrs with a fine file or hand-
and idler wheel bushings (49) for wear,
stone. Replace if other damage is evident.
scoring marks, and out-of-round condition.
g. Inspect pistons (82) for cracks, nicks,
Replace parts if unserviceable.
burrs, scoring marks, and out-of-round condi-
l. Inspect motor air manifold (9), cylinder
tion. Check that piston wrist pins (81) have a
case (96), gear case (29) and worm housing
smooth sliding fit in pistons and connecting
(71) for cracks, breaks, nicks, and burrs on
rods (93 and 94). Replace pistons if any dam-
machined surfaces, and for stripped or crossed
age is evident. Do not attempt to repair dam-
aged pistons.
threads. Remove minor nicks and burrs with a
fine file or handstone, and retap or rechase all
h. Inspect cylinder liners (80) for scoring
damaged threads. Replace the parts if damage
marks, out-of-round condition, and wear.
cannot be repaired.
ment, check the bore of the cylinder liners. If
m. Inspect reverse valve hole stud (14),
worn to more than 1.753 inches, replace the
live air stud (15), bearing stud (33), idler
cylinder liners.
wheel shafts (47), sprocket shaft (56), and
worm shaft (63) for cracks, wear, and breaks.
i. If new pistons (82) or cylinder liners (80
Replace parts if unserviceable.
are to be installed, it may be necessary to lap
n. Inspect all hardware for damaged
the pistons in the cylinder liners. Use a very
threads. Retap or rechase threads if stripped
fine, mild lapping compound. Install the con-
or crossed, or replace if unserviceable.
necting rod (93 or 94) on the piston to use as
a handle. Lap until a smooth, sliding fit is ob-
for damage and distortion. Replace if un-
tained. After lapping, clean parts with an ap-
serviceable.
proved solvent to remove all traces of lapping
compound.
p. Replace all O-rings in remote control
j. Inspect rotary valve (34) for scoring
q. Inspect spools (24 through 27) and drill
spool body (31) of remote control manifold
suitable instrument, check the valve diameter.
for cracks, burrs, chips, and other damage. Do
If worn to less than 1.121 inches, replace the
not attempt to repair damaged spools.
rotary valve.
6-11