TM 9-4940-568-20
2-87
Table 2-11. Air Compressor Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. TRIPS MOTOR OVERLOAD OR DRAWS EXCESSIVE CURRENT.
Oil viscosity too high.
Drain and fill with higher viscosity oil (Para 11-9).
Check line voltage, motor terminals for good contact, tight starter connections.
Verify line voltage and check connections.
V-Belt pulled excessively tight.
Loosen belt.
Worn or scored connecting rod, piston pin or crank pin bearings.
Replace air compressor (Para 11-2).
Defective ball bearing on crankshaft or on motor shaft. Loose motor fan. Loose bearing spacer on crankshaft.
Replace air compressor (Para 11-2).
Cylinders or piston rings scratched, worn or scored.
Replace air compressor (Para 11-2).
