TM 5-3820-239-15
Section IV. OPERATOR'S MAINTENANCE
3-8. General
3-11 Lubrication of Traction Drive and
Propelling Air Motors
Instructions in this section are published for
the information and guidance of the operator
The traction drive receives its lubrication
to maintain the pneumatic drill.
from the propelling air motor through lubri-
cation holes in the motor case cover, Thus, al-
3-9. lubricating Oil Reservolr
though there is no direct check of the oil level
in the traction drive planetary gear housing,
a. Disconnect the manifold lubricator air
the level must be the same as that in the pro-
line at the pipe plug on top of the manifold
pelling air motor. Proceed as follows.
lubricator. Remove the pipe plug.
a. To check the oil level in the propelling
b. Insert a clean dipstick and check the level
air motors, remove the pipe plug located 1/3
of oil in the lubricating oil reservoir.
of the way up from the bottom of the motor
c. Fill with the prescribed oil as often as
case (fig. 3-6). If oil flows from this port, the
necessary.
level is sufficient for both the propelling air
Caution: Do not allow the unit to run with-
motors and the traction drive.
out oil in the reservoir. This oil furnishes the
b. If it is necessary to add oil, leave the pipe
lubrication to the drifter drill and air motors,
plug off and remove the vent cap at the top of
and lack of lubrication will cause these parts
the case. Add the prescribed lubricating oil
to wear prematurely.
through the vent cap port until it flows from
Note. Normally, if the reservoir is filled at the
the pipe plug port. Install the pipe plug and
beginning of the day, the drill should operate for
the vent cap.
8 hours without refilling.
c. When necessary to drain the oil from the
traction drive planetary gear housing and pro-
3-10. Lubricator Metering Valve Setting
pelling air motor, remove the magnetic plug
and pipe plugs at the bottom of each housing
and allow all of the oil to drain off. Clean and
b. Open the valve (counterclockwise rota-
install the plugs and refill through the vent
tion) six complete revolutions.
cap port (b above).
c. Start the drill. After several minutes,
check to see that the following conditions
3-12. Checking Oil level in Hydraulic
exist:
Reservoir
(1) Oil droplets are visible on the drill
a. Remove the vent cap from the hydraulic
shank piece.
reservoir.
b. Insert a clean dipstick into the reservoir
(2) A bluish oil mist or haze is apparent
and check the level of oil, The level should be
in the exhaust.
5 inches below the top, This allows room for
d. If the above conditions do not exist, or
oil return during operation.
too much oil is flowing, readjust the valve as
Note. If the unit is new or the system was drained,
required (counterclockwise rotation allows
make sure oil is distributed throughout the closed
more oil to flow; clockwise rotation decreases
system by turning on the hydraulic pump and oper-
the flow of oil).
ating the boom cylinder through use of the hy-
draulic valve. Recheck the oil level after operation,
Caution: Do not operate the drill with the
and refill if necessary.
lubricator valve closed. The oil furnishes the
lubrication to the drifter drill and the air
c. Add the prescribed oil if necessary
motors, and lack of lubrication will cause
through the vent cap port, until the level is 5
these parts to wear prematurely.
inches below the top. Install the vent cap.
