TM 9-4940-568-20
2-88
Table 2-11. Air Compressor Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. WATER IN FRAME OR RUSTING IN RESERVOIR.
Detergent type oil being used.
Change to non-detergent type with rust and oxidation inhibitor.
Extremely light duty or located in a damp humid spot.
Drain reservoir often (TM 9-4940-568-10).
6. EXCESSIVE STARTING AND STOPPING (AUTO START).
Air leaks in piping. (On machine or in outside system.)
Replace hoses and tighten fittings.
7. COMPRESSOR RUNS EXCESSIVELY HOT.
Air to fan wheel blocked off.
Remove blockage from fan wheel.
Oil level too low.
Fill to correct level.
8. COMPRESSOR WON’T COME UP TO SPEED.
Check line voltage, motor terminals for good contact, tight starter connections.
Verify line voltage, tighten terminals and connections.
9. LIGHTS FLICKER WHEN COMPRESSOR RUNS.
Check line voltage, motor terminals for good contact, tight starter connections.
Verify line voltage, tighten terminals and connections.
Poor power regulation (unbalanced line).
Repair short in wire (see schematic Figure 2-6).
