MIL-HDBK-1164
Table 39 (Continued)
Inspection
Action
(1), (2)
D
Unloader
Check that compressor comes up to
speed and that the unloader changes at
start of the compression cycle. Listen
for a change in sound. When the
compressor stops, you will hear a small
pop and the air bleeding off the
cylinders. If the unloader is not
functioning properly, the compressor will
stall when starting, fail to start, or (if belt
driven) burn off the belts.
Safety Valves
Test weekly. Do not change pre-set
W
cutoff settings in high-pressure cutoff
switches, low oil pressure switches, and
high temperature cutoff switches. If any
of these safety switches are not
functioning properly, correct the
problem before starting the compressor
again. Record the safety switch
settings and maintain record in the
equipment file.
Air receiver
Drain the condensate from the air
D
receiver using the valve located at the
bottom of the tank. If the air receiver is
equipped with automatic drain valves,
inspect periodically for proper
functioning.
SA
Belts
Inspect the belt tension by pressing the
belt down approximately 3/4 inch
between the two pulleys. Make sure the
compressor is locked off before
performing this test. Do not over tighten
belts.
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