TM 5-3820-239-15
Chuck jaw retainer bolt, 7/18-14 x 3 1/2 in.
31 O-ring
1
32 Rotation selector cam piston
Nut, hed 7/8-14 (2)
2
33 O-ring
Chuck jw retainer
3
Hose stem
34 Left-hand cam piston
4
Air connection
35 Cam piston spring seat
5
36 Backhead
O-ring
6
37 Rifle bar
7
Air connection cap
38 Rotation pawl housing
8
Retaining ring
39 Rotation pawl housing key
O-ring
9
40 Rotation pawl plunger
10
Air connection plug
O-ring
41 Rotation pawl (6)
11
Blower hose connection
42 Air inlet housing
12
O-ring
43 Valve chest key
13
44 O-ring (2)
Blower hose connection cap
14
4 5 Back valve chest
Tube retainer
15
O-ring
46 Valve
16
Blower tube washer
47 Front valve chest
17
48 O-ring
Blower tube rubber
18
49 Valve chest cover
Blower tube
19
50 Rifle nut
Assembly rod (2)
20
51 Piston
21
Nut, hed, 7/8-14 (2)
22
Rotation selector cam
52 Piston stem bearing
Nut, hex, 1/2-20
53 piston stem bearing sleeve
23
Washer, lock, external tooth 1/2 in.
24
54 Cylinder
55 Chuck nut
Rotation selector cam pinion handle
25
Rotation selector cam pinion
56 Chuck nut spacer
26
57 Shank aligner
Backhead cap
27
58 Chuck
O-ring
28
59 Chuck jaw
Right-hand cam piston spring
29
60 Fronthead
Wear washer
30
to a 1/16-inch radius on one edge. If the pawls
n. Separate remaining parts as necessary.
are worn on both edges, they must be replaced.
6-4. Cleaning
6-6. Reassembly
Clean all parts with an approved solvent,
and blow dry with compressed air.
Reassemble drifter drill in reverse of nu-
Note the following special procedures.
6-5. Inspection and Repair
a. General. Inspect all parts for wear and
a. When assembling
rotation pawls (41, fig.
heat checks. Inspect for wear as per table 4-1.
6-1), insert them into the rotation pawl hous-
ing (38), and then press the pawl housing into
b. Piston and Cylinder. If clearance between
air inlet housing (42).
piston (51) and cylinder (54) is excessive, de-
termine which part is worn by inserting a new
Caution: Use extreme care to keep the key-
piston in the cylinder and rechecking clearance.
way of rotation pawl housing (38) alined
If clearance is then satisfactory, the piston was
with the keyway of air inlet housing (42).
worn.
Make sure that the cutout section of the ro-
c. Rifle Bar. Inspect rifle bar (37) for wear
tation pawl housing is exposed.
of ratchet teeth. If the teeth are rounded to a
b. Apply a dab of grease on each rotation
1/16-inch radius, replace the rifle bar.
pawl (41) to keep the pawls free of rotation
d. Rotation Pawls. To equalize wear on ro-
selector cam (22) when installing backhead
tation pawls (41), reverse them in the slots of
(36).
rotation pawl housing (38) when they are worn
6-3