TM 5-4310-380-13
Table 3-2. Unit Maintenance Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. FAN REVOLVES IN WRONG DIRECTION.
Check motor for proper wiring connections (para 1-14).
Reconnect motor wiring properly (para 1-14).
2. BEARINGS OVERHEAT.
Check that proper oil level is visible through sight gage (para 3-2).
If oil level is low, add oil to crankcase (para 3-2).
If oil level is normal, notify Forward Intermediate Maintenance.
3. MOTOR/CONMPRESSOR SPEED SLOW DOWN.
Check line voltage for 208 vac.
If line voltage is abnormal, notify your supervisor.
If line voltage is normal, replace the motor (para 3-21).
4. SEVERE VIBRATION.
Step 1. Check for damaged motor drive pulley and damaged compressor pulley and fan
If motor drive pulley is damaged, replace damaged motor drive pulley (para 3-15).
If compressor pulley and fan is damaged, replace damaged compressor pulley and fan (para 3-19).
If motor drive pulley and compressor pulley and fan are undamaged, proceed to step 2.
Step 2. Observe motor and compressor pulleys while air compressor is running.
If motor drive pulley is wobbling, replace motor (para 3-21).
If compressor pulley and fan is wobbling, replace compressor (para 3-16).
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