TM 5-4310-380-13
Table 3-2. Unit Maintenance Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. MOTOR WILL NOT START.
Step 1. Check air pressure gage.
If air pressure gage indicates above 175 psi (12.3 kgs/cm2) motor is not supposed to start.
Pull safety valve ring to reduce pressure to 160 psi.
If air pressure gage indicates below 175 psi (12.3 kgs/cm2), proceed to step 2.
Step 2. Check incoming power in starter box for 208 vac.
Step 3. Check starter box for blown fuses.
Step 4. 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 5.
Step 5. 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 (14.1
2
kgs/cm ).
If pressure switch is not defective, proceed to step 6.
Step 6. Loosen belt and try to turn the compressor by hand.
If compressor does not turn, replace the compressor (para 3-16).
If compressor turns, proceed to step 7.
Step 7. Check for 208 vac at motor.
If 208 vac is present, replace the motor (para 3-21).
If 208 vac is not present, proceed to step 8.
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