TM 10-4610-232-12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
A I R C O M P R E S S O R.
1. Air compressor/motor noisy.
Step 1. Check air compressor/motor drive belt.
Adjust belt, if loose (para. 4-78).
Step 2. Check mounting hardware.
Tighten hardware, if loose.
Step 3. Check if motor is causing noise.
Replace motor (para. 4-79).
Step 4. Replace air compressor (para. 4-80).
2. Air compressor assembly leaks air.
Notify direct support maintenance.
3. Air compressor overheats. Fan does not turn.
Step 1. Check rotation of compressor motor.
If rotation is incorrect, rewire motor leads by interchanging the T1 and T2 leads in the motor junction
box (para, 4-79).
Step 2. Check if air compressor turns over easily by hand.
Adjust fan drive belt, if compressor turns easily (para. 4-80).
Step 3. Check if overheating is general or localized.
(a) If overheating is general, check and clean all cooling fins.
(b) If overheating is localized, note location and replace air compressor (para. 4-80).
4. Air compressor runs but does not build up air pressure.
Step 1. Check rotation of compressor motor.
If rotation is incorrect, rewire motor leads by interchanging the T1 and T2 leads in the motor junction
box (para. 4-79).
Step 2. Check belt tension.
Adjust belt (para. 4-78).
Step 3. Check all air lines and components for leaks with soap/water mixture.
(a) If there is a high pressure leak, notify direct support maintenance.
(b) If an automatic valve leaks at vent port, repair automatic valve air control relay (para. 4-47).
(c) If there are low pressure air leaks, repair leaks (para. 4-24).
Step 4. Notify direct support maintenance.
5. Air system control pressure greater than 95 psi (655 kPa).
Notify direct support maintenance.
6. Air system control pressure less than 80 psi (552 kPa).
Step 1.
Step 2.
Step 3.
NOTE
Use soap/water mixture to check for leaks.
Check rotation of compressor motor.
If rotation is incorrect, rewire motor leads by interchanging the T1 and T2 leads in the motor junction
box (para. 4-79).
Check belts for correct tension.
Adjust belts, if necessary (para. 4-78).
Check high pressure air lines and components for leaks.
Notify direct support maintenance if leaks are found.
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