Adjust track (para. 3-
Track adjustment re-
Check propelling controls
Propelling controls do
and piping (fig. 1-8)
not release brakes.
Air leakage_ _ _ _ _ _ _ _ _ _ _ _Check hoses and fittings
Improper lubrication_ _ _ _ _Check oil level in pro-
3-21. Traction Unit Operates Improperly
pelling air motors and
lubricating oil reservoir.
Check for wedged objects
Track rollers do not ro-
Lubricate fittings (para.
and lubricate rollers
Section VI. HYDRAULIC RESERVOIR
f. Clean the magnetic plug and install on
the drain adapter at the bottom of the hydraulic
The hydraulic reservoir stores and provides
the hydraulic oil to operate the boom and guide
g. Remove and discard the return line oil
cylinders, as a result of operation of the hy-
draulic valve. The reservoir is an integral part
other parts with an approved solvent and in-
of the boom base assembly.
stall a new filter cartridge.
h. Add the prescribed oil until the level is
3-23. Servicing Procedure
within 5 inches of the top of the reservoir. In-
a. Remove the vent cap from the top of the
stall the vent cap.
i. Operate the booms with the hydraulic
b. Remove the magnetic plug from the bot-
valve to make sure oil is flowing throughout
tom of the boom base assembly.
c. Allow the oil to drain off.
j. Remove the vent cap and recheck the oil
Note. The reservoir holds 10 gallons of oil. Pro-
level with a clean dipstick. Add oil if necessary
vide a rubble container to collect the runoff.
to bring the level up to within 5 inches of the
clean With an approved solvent, and blow dry
with compressed air.
Caution: Do not overfill. The reservoir
e. Install the suction oil filter with a new
must allow for return of oil during opera-
oil filter cap gasket.
Section VII FEED CHAIN
Note. A new feed chain has a tendency to stretch
and should be checked frequently.
The feed chain passes over sprockets at each
a. Back off the nut on the bottom of the
end of the drill guide, and over idler wheels
and driving sprockets in the air feed motor,
The feed chain transmits power from the air
feed motor worm gear to the drifter drill for
b. Tighten the bottom nut until the spring
movement up and down the drill guide.
mately 1/8 inch).
c. Loosen the jam nut on the top of the drill
Check the adjustment of the feed chain by
pressing against the rollers at a point approxi-
the feed chain tension is correct. Tighten the
If the adjustment is proper, the chain will de-
flect slightly. No specific measurement can be
given, but make sure that the chain is neither so
a. Loosen the nuts at the top and bottom of
tight that no deflection occurs, nor so loose
that it sags. If the tension is improper, adjust
the feed chain.