TM 5-4310-356-14
Table 3-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Before you use this table, be sure you have performed all applicable operating checks, table
1. COMPRESSOR PUMPING OIL
Service the muffler intake filter (para 3-11).
Step 2. Check oil level. The oil level gage mounted in the compressor (fig. 1-1) is a direct-reading, glass
covered gage used to check the level of the oil in the crankcase.
If the oil level is low, remove the oil fill plug (fig. 1-1) and fill with OE/HD 10W 30
lubrication oil, to the full mark on the oil sight gage. Replace the fill plug.
2. KNOCKS OR RATTLES
Notify organizational maintenance.
Step 2. Check for leaking valves, or restricted air passages.
Notify organizational maintenance.
3. AIR DELIVERY DROPPING
Check for a clogged muffler intake filter.
Service the muffler intake filter (para 3-11).
4. EXCESSIVE STARTING AND STOPPING
Step 1. Check the receiver.
Drain the air receiver.
a. Turn ON-OFF switch to OFF.
c. When the air has escaped, leave drain cock open for a few minutes for more of
condensate to escape.
d. Close drain cock.
e. Be sure that cleaning material and tools have been removed from the air receiver.
f Move the ON-OFF switch to ON.
Step 2. Check for air leaks in the piping.
a. Make a solution of soapy water.
b. Apply to the fittings. If a leak is present it will be indicated by the soapy water
bubbling.
c. If a leak is found, notify organizational maintenance.
Step 3. Pressure switch not set properly. (The pressure switch assembly determines cut-in and cut-out pressure for
the compressor assembly. The switch can be adjusted for cut-out pressures over the range of 140 to 175
psi. The switch can also be adjusted for a 25 to 65 psi differential between cut-in and cut-out pressure. The
safety valve assembly releases when the air receiver pressure exceeds 200 psi.)
If the pressure switch is not operating properly, notify Organizational Maintenance.
5. COMPRESSOR RUNNING HOT
Step 1. Check for blockage of air to fan wheel.
Remove any object that is blocking the air passage. Use compressed air to remove any
accumulation of dust or dirt.
Step 2. Check oil level.
Refer to paragraph 1, step 2, for checking oil level.
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