TM 5-4310-377-13
Table 3-2. Unit Maintenance Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11.
MOTOR WILL NOT START.
Step 1. Check air pressure gage.
2
If air pressure gage indicates above 200 psi (14.1 kgs/cm ) motor is not supposed to start.
Pull safety valve ring to reduce pressure to 160 psi.
2
If air pressure gage indicates below 175 psi (12.3 kgs/cm ), proceed to step 2.
Step 2. Check for proper operation of pressure switch.
If pressure switch is defective, replace pressure switch (para 3-12).
2
Design cut in pressure is 175 psi 10 psi (12.5 0.70 kgs/cm ) and cut out pressure 200 psi to -10 psi.
If pressure switch is not defective, proceed to step 3.
Step 3. Push RESET switch.
If RESET switch does not reset circuit breaker, replace RESET switch (para 3-11).
If motor does not start, proceed to step 4.
Step 4. Loosen belt and try to turn the compressor by hand.
If compressor does not turn, replac e the compressor (para 3-16).
If compressor turns, proceed to step 5.
Step 5. Check for 115 vac at motor.
If 115 vac is present, replace the motor (para 3-22).
If 115 vac is not present, proceed to step 6.
Step 6. Check for proper operation of On/Off switch.
If On/Off switch is defective, replace On/Off switch (para 3-11).
If On/Off switch is not defective, notify Forward Intermediate Maintenance.
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