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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-8. Air Conditioner Lubrication Troubles
Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Oil pump worn or defective or rotating in wrong direction.
Check oil pump for proper rotation. If rotation is correct, disassemble oil pump and
check for broken oil pump tang or other worn or defective parts. Because of accuracy
required in positioning pump rotor, stator, and bushing, it is advisable to replace
complete pump and bearing head assembly when oil pump gives trouble.
Step 5.
Faulty oil piping or clogged oil line.
Check oil piping to oil pressure switch and gauge.
Check oil piping to compressor crankcase. Clean, repair, or replace piping.
Step 6.
Defective oil pressure regulator (relief valve).
Oil pressure regulator on side of crankcase is non-adjustable. Remove, check and
replace if required.
Step 7.
Worn compressor bearings.
Replace worn bearings.
4. Compressor cuts out on low oil pressure.
Step 1.
Low oil pressure.
Restore normal oil pressure.
Step 2.
Oil pressure safety switch incorrectly set or defective.
Check switch cut-in and cut-out settings. Reset or replace switch.
4-39
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