TM 5-4310-380-13
Table 3-2. Unit Maintenance Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ABNORMAL NOISE.
Disconnect all electrical power to the compressor. Check that the belt guard assembly (1) is not in contact with the
compressor fan or motor pulley. If the compressor fan or motor pulley is striking the belt guard bend the belt guard
away from the fan or pulley.
If the above corrective actions do not correct the malfunction, notify Intermediate Maintenance of possible defective
crankshaft or piston bearing.
6. LITTLE OR NO AIR PRESSURE BUILDUP.
Step 1. Inspect for leaking drain cock.
If drain cock is leaking, replace the drain cock (para 3-25).
If drain cock is not leaking, proceed to step 2.
Step 2. Inspect safety valve for leaks by applying a soapy solution to valve body.
Pull out ring and release, valve should seat.
If safety valve is leaking or defective, replace safety valve (para 3-22).
If safety valve is not leaking or defective, proceed to step 3.
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