CHAPTER 1 INTRODUCTION Section I. GENERAL 1-1. Scope 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. 1-2. Maintenance Forms and Records Maintenance forms and records that you are required to use are explained in TM 38-750 (The Army Maintenance Management System). 1-3. 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. 1-4. Equipment Serviceability Criteria This    equipment    is    not    covered    by    an     equipment serviceability criteria. 1-5. Destruction    of    Army    Material    to    Prevent Enemy Use 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 enemy use. 1-6. Administrative Storage 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 1-7. Description 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 drill. The hydraulically operated boom also permits power 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 drilling operation. (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 drilling alignment. (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 lubricator. 1-1