4-4
q. Fully backseat (open) both suction and discharge
service valves.
r. Remove vacuum pump lines.
s. Start unit and check refrigerant charge. (Refer to
section 4.4.1.b.)
t. Check moisture-liquid indicator for wetness. Change
filter-drier if necessary. (Refer to sections 4.9 and 4.10)
u. Check compressor oil level per section 4.8.a. Add oil
if necessary. (Refer to section 4.8.b.)
4.6 COMPRESSOR DISASSEMBLY
NOTE
Removing the press fit stator in the field is not
recommended. The rotor and stator are a
matched pair and should not be separated.
When disassembling compressor, matchmark parts
so they may be replaced in their same relative positions.
(See Figure 4-2 for an illustration of the compressor.)
Refer to Table 4-1 and Table 4-2 for compressor wear
limits and bolt torque values.
a. Place the compressor in a position where it will be
convenient to drain the oil. Remove the oil plug on oil
pump inlet passage (See Figure 4-6 for location) to vent
the crankcase. Loosen the drain plug (See Figure 4-2) in
bottom plate and allow the oil to drain out slowly.
Remove the plug slowly to relieve any crankcase
pressure. A plug in the bottom center of the crankcase
may also be removed for draining the motor end more
quickly. (Some units do not have this plug.)
1
2
3
4
5
7
6
1. Cylinder Head Gasket
2. Discharge Valve Screw and Lockwasher
3. Discharge Valve Stop
4. Discharge Valve
5. Valve Plate
6. Valve Plate Assembly
7. Valve Plate Gasket
Figure 4-4. Exploded View of Valve Plate
b. Remove cylinder head capscrews. If the cylinder
head is stuck, tap the cylinder head with a wooden or lead
mallet. Be careful not to drop the head or damage the
gasket sealing surface. (See Figure 4-2 and Figure 4-4.)
Remove cylinder head gasket.
c. Free the valve plate from the cylinder deck by using
the discharge valve hold down capscrews as jack screws
through the tapped holes of the valve plate after the valve
stops and valves have been removed. Remove the valve
plate gasket. (See Figure 4-4.)
d. Turn the compressor over on its side and remove the
bottom plate. Remove the bolts and connecting rod caps
(See Figure 4-5). Match mark each connecting rod cap
and connecting rod for correct reassembly. Push the
piston rods up as far as they will go without having the
piston rings extend above the cylinders.
e. If necessary, remove the oil return check valve.
Inspect it for check valve operation (flow in one direction
only). Replace assembly if its check valve operation is
impaired. (See Figure 4-5.)
1
2
3
4
5
1. Oil Pressure Relief Valve
2. Oil Return Check Valve
3. Oil Suction Tube
4. Capscrew
5. Connecting Rod and Cap Assembly
Figure 4-5. Bottom Plate Removed
CAUTION
The copper tube which connects to the oil suction
strainer extends out the bottom with the bottom
plate removed. Take precautions to avoid
bending or breaking it while changing crankcase
positions.
f.
There are two types of oil pumps; vane and gear. See
Figure 4-3 to identify which oil pump is used, then follow
the correct procedure below.
Vane Oil Pump:
1. Remove the oil pump cover capscrews (See
Figure 4-2). This will free the oil feed guide retaining spring
cover gasket, and the oil feed guide. (See Figure 4-6.) Hold
piston to prevent shaft from turning if necessary.
2. Remove the oil pump drive segment screws and
lockwashers before the bearing head is removed. (See
Figure 4-6.) Unscrew the bearing head capscrews,
remove the bearing head, and then remove the bearing
head gasket.
3. With the pump-end bearing head removed from the
compressor, remove the plunger retaining rings with snap
ring pliers. As each retaining ring is removed, the spring
guide, vane spring and pump vane may be removed from
the vane cylinder in the bearing head. (See Figure 4-6.)
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