TM 5-4310-393-14
TABLE 3-1. OPERATOR/CREW TROUBLESHOOTING PROCEDURES (CONTINUED).
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST OR INSPECTION/CORRECTIVE ACTION
COMPRESSOR
5. COMPRESSOR OIL SIGHT GLASS SHOWS BUBBLES
Air trapped in oil pump
Vent pump and line (paragraph 3-14.1)
Oil pressure regulator.
Clean and adjust oil pressure regulator (paragraph 3-14.1).
6. OIL FOAM IN COMPRESSOR CRANKCASE.
Refer to Unit Maintenance.
7. COMPRESSOR WORKS IRREGULARLY.
V-Belt slipping
Replace or adjust as indicated (paragraph 3-14.2)
8. OIL RESIDUE IN DELIVERED AIR.
Purification filter cartridge.
Replace filter cartridge (paragraph 3-16.2).
9 COMPRESSOR DOES NOT ATTAIN FINAL PRESSURE
Condensate drain valves
Valves or fittings leaking Tighten.
Final stage safety relief valve opening too soon.
Replace safety relief valve.
Piston rings worn.
Refer to Unit Maintenance.
Excessive piston clearance
Refer to Unit Maintenance.
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