TM 5-4310-375-14
Section IV. TROUBLESHOOTING
4-10. Introduction. This section contains those checks and corrective actions which will isolate defects which can be
corrected by performance of maintenance allocated to organizational maintenance technicians by the MAC, Appendix B.
4-11. Troubleshooting table. Table 4-3 lists Malfunctions, Test or Inspection, and Corrective Actions. The table is based
on symptoms which you may observe during PMCS. Only checks and corrective actions authorized for organization are
listed. (Operator/Crew Troubleshooting is found in table 3-2.)
Table 4-3. Organizational Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. COMPRESSOR PUMPING OIL
Step 1. Check for oil mixed with condensate when air receiver is drained.
Possible piston ring damage, notify Direct Support Maintenance.
Step 2. Check cylinder and cylinder head for overheating. Could indicate damaged piston rings.
Notify Direct Support Maintenance.
2. MOTOR STARTING AND STOPPING FREQUENTLY
Step 1. Use soapy water solution applied with brush to check for air leaks in piping. Leakage will be indicated by
bubbling of solution.
Refer to para 4-30 and replace defective fittings.
Step 2. Inspect pressure switch for loose connections and faulty operation.
Refer to para 4-17 and inspect pressure switch. If defective, notify Direct Support Maintenance for
adjustment, repair, or replacement.
3. AIR DELlVERY DROPPING
Step 1. Check for air leaks in piping.
Refer to para 4-30.
Step 2. Check for restricted air passages, worn or broken first or second stage valves.
Refer to para 4-19. If valves are not defective or passages restricted, notify Direct Support Maintenance
for repair or overhauI of compressor.
4. UNIT KNOCKS OR RATTLES
Step 1. Check for loose or damaged drive belts and pulley.
Refer to para 4-14 for adjustment or replacement.
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