This manual contains instructions for use by operator
and organizational maintenance personnel to whom the
pneumatic rock drill is issued. It provides information on
the operation and organizational maintenance of the
equipment. Also included are descriptions of main units
and their functions in relation to other components.
Maintenance Forms and Records
Maintenance forms and records that you are required to
use are explained in TM 38-750 (The Army Maintenance
Reporting of Errors
You can improve this manual by calling attention to
errors and by recommending improvements, using DA
Form 2028 (Recommended Changes to Publications) or
by a letter and mailing directly to Commander, U.S.
Army Troop Support Command, ATTN: AMSTS-MPP,
4300 Goodfellow Blvd., St. Louis, Missouri 63120. A
reply will be furnished directly to you.
Equipment Serviceability Criteria
This equipment is not covered by an equipment
Destruction of Army Material to Prevent
Refer to TM 750-244-3 (Procedures for Destruction of
Equipment to Prevent Enemy Use) for information and
instructions on destruction of equipment to prevent
Refer to TM 740-90-1 (Administrative Storage of
Equipment) for information and instructions pertaining to
organizational maintenance administrative storage.
Section II. DESCRIPTION AND DATA
a. General. The pneumatic drifter drill (figs. 1-1
and 1-2) is a heavy duty, self-propelled crawler drill. The
ram mounts a hydraulically operated swing boom jib that
permits positioning of the feed and
positioning of the feed for vertical and horizontal drilling.
The drill also can be positioned over the side of the
crawler track for drilling in confined areas.
b. The pneumatic rock drill assembly is
equipped with the following major components:
(1) A heavy duty precision type drill engine (fig.
1-1), designed for deep hole drilling in hard rock.
(2) A drill feed and control valve (fig. 1-1) to
control the drill, blow, feed, and rotation functions.
(3) A feed assembly (fig. 1-1) used as a track
for the drill engine to slide back and forth during the
(4) A hydraulic feed extension cylinder (fig. 1-2)
to provide a four foot extension for the feed mechanism
and to maintain pressure on the stinger.
(5) A stinger (fig. 1-1) mounted on the front end
of feed to provide a pressure point for drilling.
(6) A centralizer (fig.1-1) used to maintain
(7) A feed motor and transmission (fig. 1-1),
used to pull the drill slab back, forward or backward
along the feed.
(8) A boom (fig. 1-1), which is a connecting
assembly between the feed mechanism and the tractor.
(9) A boom lift cylinder (fig.1-2) used to raise
and lower the boom assembly.
(10) A boom swing cylinder (fig.1-2) used to
move the boom assembly from left to right.
(11) A feed tilt cylinder (fig. 1-2) to control the
horizontal and vertical position of the feed.
(12) A feed swing cylinder (fig.1-2) used to
move the forward end of the feed from left to right.
(13) An upper main frame assembly or pedestal
(fig. 1-1) is a steel weldment which mounts the boom
controls, tramming controls, pump motor shut-off and