2-14. Operation in Extreme Cold
c. Place the ROTATION control in the
neutral position to stop rotation.
d. Use the FEED control to lower the drill,
a. Keep lubricating oil reservior and hy-
and hold the bit at the bottom of the hold under
draulic reservoir full at all times to prevent
normal feed pressure.
e. Move the DRILL control on and off in
b. Use grade OES lubricating oil for im-
short bursts until the coupling is loose on the
proved performance in cold weather.
f. Shut off the DRILL control.
warmed up before drilling.
g. Place the ROTATION selector in the re-
d. Avoid sharp bends in hoses and handle
them with care. They may become brittle at ex-
h. Open the centralizer arms and feed the
drill up the drill guide.
e. Check all exhaust ports frequently for
i. Stop the drill feed when the coupling
frost formation. Defrost as necessary.
clears the top of the centralizer.
Warning: Do not touch unpainted metal
j. Close the centralizer arms and feed the
surfaces with bare hands. The skin may stick
drill down until the coupling rests on top of
to the metal surfaces at extreme tempera-
k. Operate the DRILL control at part
throttle to unscrew the drill steel from the
2-15. Operation in Extreme Heat
coupling resting on the centralizer, and the
a. Where possible, take advantage of natu-
coupling on the shank piece.
ral barriers to keep the unit from direct rays
l. Stop rotation and feed the drill down the
of the sun.
drill guide until the shank piece engages the
b. Inspect hoses frequently for signs of de-
coupling resting on the centralizer.
terioration due to excessive heat.
m. Place the ROTATION selector in the
conventional (left-hand) rotation position and
2-16. Operation in Dusty or Sandy Areas
screw the shank piece into the coupling. Do
a. Shield the unit from dust. Take advan-
not screw the joint tight.
tage of natural barriers which offer protection
n. Repeat the procedure to remove succes-
from blowing sand or dust.
sive sections of drill steel.
b. Strain lubricating oil and hydraulic oil be-
o. Shut off the main air valve and discon-
fore adding to the manifold lubricator and hy-
nect the bull hose if operation is complete.
draulic reservoir, respectively. Make sure pour-
ing vessels are clean, and take precautions to
p. Perform the necessary daily preventive
avoid dust or grit getting into the reservoirs
during refilling process.
c. Blow all air hoses out before attaching
2-13. Operation Under Usual Conditions
them to the pneumatic drill.
d. Take extra care to make sure that oil va-
a. Start the pneumatic drill as described in
por is emerging from the drill before attempt-
ing drilling operations.
b. Operate the pneumatic drill as described
e. Between operating periods, cover, the en-
tire unit if possible or seal all openings with
Warning: Wear a respiratory mask at all
cloth or tape.
times during drilling operations, to prevent
rock drill dust from entering the lungs. Wear
2-17. Operation Under Rainy or Humid
damage from flying particles.
a. Keep the pneumatic drill in a sheltered
area if possible, or keep the unit covered when
c. Stop the pneumatic drill as described in
not in use.