TM 10-3930-653-14&P 4-3-2.  TROUBLE DIAGNOSES AND CORRECTIONS Condition Probable cause Corrective action Oil leakage Damaged or cracked body cover. Replace. Oil leakage from gasket. replace Oil leakage from regulator valve. Tighten or replace. Oil leakage from blind plug. replace. Decreased oil Leak of oil in engine oil pan. Correct. pressure Dirty oil strainer. Clean or replace. Damaged or worn pump rotors. Replace. Defective regulator. Replace. Use of poor quality engine oil. Replace. Warning light Decreased oil pressure. Previously mentioned. remains “on”. Oil pressure switch unserviceable. Replace. engine running Electrical fault. Check circuit. Noise Excessive backlash in pump rotors. Replace. 4-52

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