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TM 5-4120-364-13
b .  Removal. Refer to paragraph 4-16 and remove the motor compressor assembly
from the air conditioner.
Disassembly.
c.
(1) Oil filter screen and relief valve. If oil pressure is low, remove
a n d check the oil filter screen and relief valve. The screen and valve are access
ible through bottom cover plate. Proceed as follows:
(a) Remove screws (32, figure 4-11), gaskets (33), bottom plate (34),
gasket (35) and filter screen (37).
( b ) Unscrew relief valve a s s e m b l y ( 6 9 ) f r o m m o t o r p a r t i t i o n p l a t e .
(2) Inspect.
(a) Inspect strainer for holes and dirt. Clean with solvent or
replace.
( b ) I n s p e c t r e l i e f v a l v e a s s e m b l y for clogging or stuck plunger.
C l e a n with solvent or replace.
(3) I n s t a l l a t i o n .
(a) Screw relief valve into motor partition plate.
( b ) P o s i t i o n f i l t e r s c r e e n i n b o t t o m o f c o m p r e s s o r a n d connect to
oil suction tube (36).
( c ) Install new gasket (35), bottom plate (34) and s e c u r e with screws
( 3 2 ) and gaskets (33).
(4) Oil Pump and Bearing Head. The oil pump assembly (38) is contained
in the pump end bearing head casting. The pump end main bearing is a machine part
of this casting. An insert bearing is not used or required.
(a) Removal.
1. Remove bearing head assembly (38) from crankcase by removing
screws (51) and washers (52). Then remove oil pump vane assemblies (54 through 57)
f r o m both sides of bearing head.
2 . Remove in sequence: oil pump rover (40), oil feed guide re-
taining spring (42), oil feed guide (43), and pump drive segment (48).
3 . Slide pump rotor (50) out of bearing head by pushing against
bearing side of rotor.
4 . Remove retaining ring (49) from pump rotor (50).
(b) Replace.
1. Install rotor retaining ring (49) in ring groove of pump rotor
4-23

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