Compressor Disassembly; Figure 28. Exploded View Of Valve Plate; Figure 29. Bottom Plate Removed - Carrier 69NT40-489-100 Series Operation And Service Manual

6.8.2 Compressor Disassembly

WARNING
Before disassembly of any external com-
pressor component make sure to relieve
possible internal pressure by loosening the
bolts and tapping the component with a
soft hammer to break the seal.
CAUTION
Removing the compressor motor 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 27.) Refer to Table 17, page 82 and
Table 18, page 83 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 fill plug
(see Figure 27, page 61) to vent the crankcase.
Loosen the drain plug in bottom plate and allow the oil
to drain out slowly. Remove the plug slowly to relieve
any crankcase pressure. Some units have a plug in
the bottom center of the crankcase which may be
removed for draining the motor end more quickly.
1 2 3 4
JACK HERE
1. Cylinder Head Gasket
2. Discharge Valve
Screw & Lockwasher
3. Discharge Valve Stop

Figure 28. Exploded View of Valve Plate

T-305
5 7
6
4. Discharge Valve
5. Valve Plate
6. Valve Plate Assembly
7. Valve Plate Gasket
2
1
5
4
1. Oil Pressure Relief
Valve
2. Oil Return Check
Valve

Figure 29. Bottom Plate Removed

b. Loosen cylinder head capscrews. If the cylinder head
is stuck, tap the center of the cylinder head with a
wooden or lead mallet. Do not strike the side of the
cylinder head. Be careful not to drop the head or dam-
age the gasket sealing surface. Remove cylinder
head bolts and gasket (see Figure 28).
c. Remove valve stops and valves. After they have been
removed, free the valve plate from the cylinder deck
by using the outside discharge valve hold-down caps-
crew as a jack screw through the tapped hole of the
valve plate. Remove the valve plate gasket.
d. Turn the compressor on its side and remove the bot-
tom plate oil suction screen and screen hold down
plate. Inspect the screen for holes or an accumulation
of dirt. The screen can be cleaned with a suitable sol-
vent.
e. Match mark each connecting rod cap (see Figure 29)
and connecting rod for correct reassembly. Remove
the bolts and connecting rod caps. Push the piston
rods up as far as they will go without having the piston
rings extend above the cylinders.
The copper tube which connects to the oil
suction strainer extends out the bottom
with the bottom plate removed. Take pre-
cautions to avoid bending or breaking it
while changing crankcase positions.
f. If necessary, remove the oil return check valve. (See
Figure 29.) Inspect it for proper operation (flow in one
direction only). Replace the assembly with a new unit
if check valve operation is impaired.
g. To remove the oil pump (see Figure 30) remove eight
capscrews, oil pump bearing head assembly, gasket
and thrust washer.
62
3. Oil Suction Tube
4. Capscrew
5. Connecting Rod and
Cap Assembly
CAUTION
3