TM 5-3805-290-23-1
AIR CONDITIONING SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0018 00
REFRIGERANT COMPRESSOR OIL CHECK
N OT E
A special refrigerant oil is used in AC system. Oil mixes completely with refrigerant so all components
receive lubrication. A check of refrigerant oil in compressor will give an indication of amount of oil in sys-
tem.
Generally, oil in compressor is checked when there is evidence of a major loss of oil. These conditions may
cause loss of oil:
Broken refrigerant hose.
Hose fitting (leaks).
Badly leaking compressor seal.
Component damage.
Complete Check of Compressor Oil
1.
Operate engine at 1,000 rpm. Set temperature on maximum cooling setting. Move fan speed switch to HIGH. System
will stabilize in a minimum of 10 minutes (TM 5-3805-290-10).
2.
Stop engine. Remove refrigerant charge from system (WP 0191 00).
3.
Remove compressor from machine (WP 0192 00). Place protective caps on all fittings and hoses.
427-B2091
4.
Place compressor in a horizontal position so oil plug is facing downward. Remove oil plug from compressor. Drain oil
into a clean container. Rock compressor back and forth in order to remove all oil. Also, rotate compressor shaft in order
to drain rest of oil that is in oil sump. Record volume of drained refrigerant. Inspect oil for these items:
a.
b.
Metal chips
c.
Rubber particles
d.
Foreign material
0018 00-9