TM 5-4310-356-14
Table 4-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Before you use this table be sure you have performed all operating checks.
1. COMPRESSOR PUMPING OIL
Step 1. Check for a leaking release valve.
Refer to paragraph 4-16 and replace a leaking release valve.
Step 2. Check for a hot cylinder head. If one seems hotter than the other, there could be damage to the rings.
Notify direct support maintenance.
2. KNOCKS OR RATTLES
Step 1. Check for loose belt wheel or pulley.
Refer to figure 4-4 and replace the electric motor if the pulley is bad.
Step 2. Check for leaking release valve.
Refer to paragraph 4-16 and replace a leaking release valve.
3. AIR DELIVERY DROPPING
Step 1. Check for air leaks in piping.
a. Make a solution of soapy water.
b. Apply to the fittings, if a leak is present it will be indicated by the soapy water bubbling.
Refer to paragraph 4-18 and replace fittings if tightening does not stop the bubbles.
Step 2. Check for a leaking release valve.
Refer to paragraph 4-17 and replace a leaking valve.
Step 3. Check for restricted air passages, leaking or broken valve.
Notify Direct Support Maintenance.
4. MOTOR OVERLOAD RELAY TRIPS
Step 1. Check line voltage or motor terminals for loose connections.
Tighten loose connections.
Step 2. Check for defective starter heaters.
If a defective starter heater is found, notify Direct Support Maintenance.
5. EXCESSIVE STARTING OR STOPPING
Step 1. Check receiver for condensate.
Refer to paragraph 3-12 and drain the condensate.
Step 2. Check for air leaks in piping, or the receiver check valve leaking.
Repeat Step 1 in paragraph 3 above.
Step 3. Check for leaking, broken, or worn pressure switch (fig. 1-2).
Notify Direct Support Maintenance.
6. COMPRESSOR RUNNING HOT
Step 1. Check that air passage is not blocked at fan wheel.
Remove any foreign objects that may be blocking ventilation.
Step 2. Check for a leaking check valve.
Refer to paragraph 4-18 and replace a defective check valve.
7. COMPRESSOR RUNNING SLOW
Step 1. Check for low line voltage, or a defective motor starter heater.
Tighten loose connections. If the compressor still runs slowly, notify Direct Support Maintenance.
Step 2. Check for a leaking release valve.
Refer to paragraph 4-17 and replace a leaking release valve.
4-5
