TM 5-4310-352-14
oil or dust remains to damage new belts.
c. Air Compressor. The air compressor is a two-
(2) Place belts in their proper grooves, then
stage, two cylinder compressor mounted on top of the air
move motor away from compressor until belts are nomi-
receiver. It is air cooled, by an intercooler between Ist and
nally tight. Tighten mounting nuts.
2nd stage cylinders, and an aftercooler between 2nd
(3) Visually check bottom line of belts for a
stage and the receiver. It has an unloader and pilot valve
slight droop between pulley centers. If this droop is there,
to relieve internal pressure when the compressor is
belts should be in adjustment.
stopped. There is a breather tube between compressor
(4) If no droop is seen, the belts may be too
frame and the inlet filter (inboard side). This connection
tight. Adjust the measurement and scale method de-
permits pulsations, created by the reciprocating action of
scribed in paragraph 3-6.
the pistons, to be vented to the atmosphere. This elimi-
(5) When belts are adjusted reinstall the front
nates any pressure build up within the frame.
belt guard (para 3-7).
d. Pilot Valve. When the pilot valve core is un-
(6) Unlock and turn on power at source.
seated by action of the centrifugal unloader, it permits
pressure to bleed from the compressor and discharge
4-9. Motor
line. The cylinders and the intercooler are also relieved of
a. Removal
all pressure while the compressor is stopped.
e. Inlet Filter. The inlet filter cleans the air entering
(1) Remove V-belts (para 4-8).
(2) Tag and disconnect electrical leads in con-
the first stage cylinder. Frequent cleaning, the time period
duit from motor starter at motor.
depending on environment, is necessary to insure capac-
(3) Remove motor mounting hardware.
ity output of the compressor.
(4) Lift motor from mounting brackets on the
air receiver.
4-8. V-Belt (Matched Pair)
b. Installation.
a. Removal.
(1) Install motor on the mounting brackets and
(1) Turn off compressor power at source, and
secure with motor mounting hardware.
lock it out.
(2) Connect electrical leads.
(2) Remove front belt guard (para 3-7).
(3) Install V-Belts (para 4-8).
(3) Loosen nuts on motor mounting capscrews
4-10. Air Compressor
motor toward the compressor.
a. Removal.
(4) Lift belts off the pulleys.
b.
Installation.
(1) Turn power off at source and lock it out.
(2) Remove belt guard (para 3-7), belts (para
NOTE
Never pry new belts over edges of pulley
from check valve in the air receiver.
grooves. Be sure motor has been moved
(3) Remove 4 capscrews (2, fig. 4-1) and lock-
toward compressor so that belts fit easily
washers (3).
over the pulleys.
(1) Clean grooves in belt pulleys to be sure no
4-3
