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 TM 55-1905-219-14-8
4-28. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(c) During start up, observe the oil pressure gauge to be sure that oil pressure develops during the
first few minutes. Always check oil pressure when starting. The oil pressure should be normal after steady
operating conditions have been reached and the oil has stopped foaming. Oil foaming may last fifteen minutes
or longer.
(d)
If normal oil pressure does not develop, find and correct the trouble. Low oil pressure may be
caused by:
1
Insufficient oil in crankcase.
2
Oil pressure regulator not seating properly.
3
Oil filter screen in bottom of crankcase clogged withdirt.
4
Oil pump worn or defective or rotating in wrong direction.
5
Faulty oil piping.
(7)
Oil Pressure Regulator.
OIL REGULATING VALVE (NON-ADJUSTABLE)
Oil Pressure Regulator
(b) If correct oil pressure is not obtained, remove and check the oil pressure regulator to see if it is
seating properly. Refer to paragraph 4-29.
(c) After checking it, replace oil pressure regulator, start compressor, and check oil pressure. If oil
pressure is still too low, oil pump rotation is correct, and oil filter screen in bottom of crankcase is clean, replace
the regulator.
4-848
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