TM 5-4310-393-14Table 4-2. Direct Support Troubleshooting Procedures (Continued)MALFUNCTION/SYMPTOMPROBABLE CAUSETEST OR INSPECTION/CORRECTIVE ACTION5. SIGHT GLASS SHOWS AIR BUBBLES.Oil pressure regulator.Clean and adjust regulator.Oil pump final pressure.Clean and adjust pump.Third stage piston clearance.Replace piston.6. COMPRESSOR DOES NOT ATTAIN FINAL PRESSURE.Final stage safety valveReplace as necessary.Drain valves open or leaking.Check drain valves.Intermediate stage pressuresReplace valves/rings as needed.7. EXCESSIVE VIBRATION.Fuel timing of engine.Check, adjust as necessary.Loose mounting bolts.Check, adjust as necessary.Cracked frame.Weld as needed.8. NO OIL PRESSURE.Oil pump failure.Test and service as required.4-7
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