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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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