TM 5-4310-375-14
Table 5-1. Direct Support and General Support Troubleshooting- Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Refer to para 4-15 and remove, disassemble, repair or replace, assemble and install the magnetic starter
or on-off switch.
Step 4. Check for a defective motor.
Refer to para 4-16.a and test motor. If motor is defective, remove motor in accordance with para
2. ELECTRIC MOTOR REVERSES.
Step 1. Check motor leads for proper connection to magnetic starter in control box.
Refer to MALFUNCTION 1, Step 1, and connect leads properly.
3. ELECTRIC MOTOR OVERHEATS.
Step 1. Use a volt meter and check for low line voltage from power source.
If voltage is low, connect to another power source.
Step 2. Check alignment of motor pulley and compressor pulley.
Refer to figure 2-3 and align the pulleys and adjust the drive belts.
Step 3. Check electric motor for any accumulation of dirt, foreign matter, and belt guard obstructions that
would cause poor cooling air circulation.
WARNING
When cleaning with compressed air, nozzle pressure shall not exceed 30 psi
(2.11 kg/cm2). Eye protection is required.
Remove dirt and foreign matter with air hose.
4. ELECTRIC MOTOR NOISY.
Step 1. Check motor mounting hardware for tightness.
Tighten mounting hardware. Check alignment of pulleys and belt tension. Refer to figure 2-3.
Step 2. Motor bearings may be defective. If noise is coming from inside of motor, the motor should be repaired.
Refer to para 5-5 and repair the motor.
5. ELECTRIC MOTOR DOES NOT CUT-IN OR CUT-OUT AT PROPER AIR PRESSURE.
Step 1. Check pressure switch for proper setting.
5-2
