TM 5-4310-377-13
Table 3-2. Unit Maintenance Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
ABNORMAL NOISE.
Disconnect all electrical power to the compressor. Disconnect piping. Remove four bolts (1), head (2), and gasket
(3). Inspect for loose valve assembly and for signs of piston striking head. Repeat for other two cylinders.
If valve is loose, tighten valve push cover (4). Install new head gasket (3), head (2), and four bolts (1).
Tighten all four bolts (1) securely. Reconnect piping.
If piston was striking head, install two new gaskets (3), head (2), and four bolts (1). Tighten all four bolts (1)
securely. Reconnect piping.
If the above corrective actions do not correct the malfunction, notify Forward 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 3-26).
If drain cock is not leaking, proceed to step 2.
Step 2. Inspect 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 3-23).
If safety valve is not leaking or de fective, proceed to step 3.
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