MOTOR COMPRESSOR

TM 5-4120-364-13

b . Removal. Refer to paragraph 4-16 and remove the motor compressor assembly

from the air conditioner.

Disassembly.

(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