Chuck jaw retainer bolt, 7/18-14 x 3 1/2 in.
32 Rotation selector cam piston
Nut, hed 7/8-14 (2)
Chuck jw retainer
34 Left-hand cam piston
35 Cam piston spring seat
37 Rifle bar
Air connection cap
38 Rotation pawl housing
39 Rotation pawl housing key
40 Rotation pawl plunger
Air connection plug
41 Rotation pawl (6)
Blower hose connection
42 Air inlet housing
43 Valve chest key
44 O-ring (2)
Blower hose connection cap
4 5 Back valve chest
Blower tube washer
47 Front valve chest
Blower tube rubber
49 Valve chest cover
50 Rifle nut
Assembly rod (2)
Nut, hed, 7/8-14 (2)
Rotation selector cam
52 Piston stem bearing
Nut, hex, 1/2-20
53 piston stem bearing sleeve
Washer, lock, external tooth 1/2 in.
55 Chuck nut
Rotation selector cam pinion handle
Rotation selector cam pinion
56 Chuck nut spacer
57 Shank aligner
59 Chuck jaw
Right-hand cam piston spring
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.
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
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).
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
rotation pawl housing (38) when they are worn