TM 5-3820-241-34
(a) Insert shaft (fig. 5-11) through
(a) Assemble the support ring (fig. 5-12)
opening, through the torque compensator gear
to the chuck. Install this assembly into the yoke
and into cap.
and tap into place until the support ring shoulders
in the housing. Install buffer ring in the cylinder.
(b) Turn shaft until pin dowels into the
(b) Position t h e t h r u s t p l a t e i n the
hole in the cap. Install spring, cover and secure
cylinder against the buffer ring. Position cylinder
with four lockwashers and capscrews.
(c) Assemble needle bearings into motor
in yoke (exhaust port towards the cradles) and
tap lightly until cylinder bottoms on yoke.
bearing support. Install motor bearing support
into housing, a l i g n support and housing and
( 6 ) Reassemble the piston, valve and
install aligning pin.
rotation parts as follows:
(d) Install vanes in rotor, assemble needle
(a) Position the piston (41, fig. 5-8), in the
bearing on rotor, a n d install the rotor in the
c y l i n d e r assembly (39), with flutes on piston
housing. Make sure the seal in back cover is in
entered in slots on chuck nut.
place and install back cover on the housing and
(b) Hold locating pin (30) in the groove in
secure with four nuts.
the cylinder assembly (39), line up slots in the
(5) To assemble the chuck parts refer to
valve seat assembly (34) and valve block (33) with
figure 5-12 and proceed as follows:
locating pin (30) and assemble the valve into the
cylinder assembly (39). Tap into position until the
valve assembly seats on the cylinder lining.
(c) Install pawl spring (25). pawl plunger
(24) and pawls (23) into rifle bar (21).
(d) Install the rifle bar flutes into the rifle
nut (42) and install rotation release ring (20), into
r a t c h e t ring (26). Line up ratchet ring with
locating pin (19) and tap into position against the
valve cover. Install support ring (27).
(7) Tighten n u t s ( 9 ) a l t e r n a t e l y a n d
uniformly to 125 ft. lb. torque.
b. Installation.
(1) Install t h e drifter drill assembly in
reverse of numerical sequence as illustrated in
(2) Refer to LO 5-3820-241-12 and service
the rock drill.
Figure 5-12. Reassembly of chuck assembly.
Section IV. DRILL AND FEED CONTROL VALVE
5-13. General
b. Disassembly. Disassemble the drill and feed
c o n t r o l valve i n disassembly sequence as
The drill and feed control valve controls the drill
illustrated in fig. 5-13.
feed, blow, and rotation functions and is mounted
on the front end of the feed assembly.
5-14. Drill and Feed Control Valve, Removal and
Disassembly
a. Removal. Refer to TM 5-3820-241-12 ane
remove the drill and feed control valve.
