TM 9-4940-568-20
2-86
Table 2-11. Air Compressor Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. KNOCKS OR RATTLES (CONT).
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).
3. AIR DELIVERY HAS DROPPED OFF.
Clogged intake filter/silencer(s).
Replace air compressor (Para 11-2).
Air leaks in piping. (On machine or in outside system.)
Replace air compressor (Para 11-2).
Leaking or maladjusted centrifugal pilot valve, or defective o-ring on pilot valve.
Replace air compressor (Para 11-2).
Leaking, broken, or loose valves.
Replace air compressor (Para 11-2).
Cylinders or piston rings scratched, worn or scored.
Replace air compressor (Para 11-2).
