TM 5-4310-349-14
Table 5-1. Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
ELECTRIC MOTOR NOISY.
Step 1.
Electric motor mounting bolts or brackets loose.
Tighten mounting bolts and brackets
Step 2.
Electric motor interior dirty.
Clean electric motor.
Step 3.
Electric motor bearings worn
Repair electric motor (para 5-6).
Step 4.
V-belts improperly adjusted.
Adjust V-belts (para 3-7).
5.
ELECTRIC MOTOR DOES NOT CUT IN AT 140 PSI, AND CUT OUT AT 175 PSI
Step 1.
Pressure switch not set properly.
Adjust pressure switch (para 5-8).
Step 2.
Pressure switch defective.
Replace or repair pressure switch (para 5-8).
Step 3.
Incoming power source disconnected.
Connect air compressor incoming power source.
6.
COMPRESSOR PUMPS TOO SLOWLY
Step 1.
Intake air muffler clogged.
Service intake air muffler (para 3-9).
Step 2.
V-belts improperly adjusted.
Adjust V-belts (para 3-7).
Step 3.
Oil level low.
Check oil level in crankcase and fill in accordance with Lubrication Order LO 5-4310-349-12
Step 4.
Intake and exhaust valves faulty.
Clean or replace valves (para 5-4 ).
Step 5.
Air leakage in unit.
Tighten connection.
Step 6.
Load too great for compressor.
Reduce load requirements of compressor.
7.
COMPRESSOR OVERHEATS.
Step 1.
Flywheel defective
Replace flywheel.
Step 2.
V-belts slipping.
Adjust V-belts (para 3-7).
Step 3.
Intake and exhaust valves faulty.
Clean or replace valves (para 5-4).
Step 4.
Intake air muffler dirty.
Service intake air muffler (para 3-9).
Step 5.
Oil level low.
Inspect oil level in crankcase and fill in accordance with Lubrication Order LO 5-4310-349-12.
Step 6.
Improper rotation flywheel.
Check wiring of electric motor (fig. 1-3).
8.
COMPRESSOR FAILS TO PUMP TO PRESSURE.
Step 1.
Air leakage in unit.
Eliminate by tightening connections.
Step 2.
Pressure switch defective.
Replace or repair pressure switch (para 5-8).
Step 3.
V-belts improperly adjusted.
Adjust V-belts (para 3-7).
Step 4.
Intake and exhaust valves defective.
Clean or replace valves (para 5-4).
Step 5.
Governor leaking.
Repair or replace governor (para 5-4).
Step 6.
Motor defective.
Repair or replace motor.
Step 7.
Intake air muffler clogged.
Clean or replace intake air muffler (para 3-9).
5-2
