4-14
©
2012 Mobile Climate Control
T-348 Rev. 07/2012
1
.
Electric Unloader
Valve
2. Suction Service
Valve Charging Port
3. Suction Service
Valve
4. Clutch
5. Oil Fill Plug
6. Bottom Plate
7. Oil Drain Plug
8. Oil Level Sight Glass
9. Oil Pump
10. O--ring
11. Discharge Service
Valve
12. Service Port
1
2
3
4
5
6
7
8
9
10
11
12
Figure 4-12 Compressor
g. Remove the three socket head capscrews from the
cylinder head(s) that have unloader valves instal
led. See Figure 4-13. Remove the unloader valve
and bypass piston assembly, keeping the same
capscrews with the assembly. The original un
loader valve must be transferred to the replace
ment compressor. The plug arrangement re
moved from the replacement is installed in the
original compressor as a seal. If piston is stuck, it
may be extracted by threading a socket head
capscrew into top of piston. A small Teflon seat
ring at the bottom of the bypass piston plug must
be removed.
GASKET
BYPASS
PISTON
PLUG
SPRING
FLANGE
COVER
(NOT INTERCHANGEABLE WITH
CONTROL VALVE SCREWS)
COMPRESSOR
HEAD
CAPSCREWS
Figure 4-13 Removing Bypass Piston Plug
h. Remove the pressure switches and install on re
placement compressor after checking switch op
eration. Refer to paragraph 4.10.
i. Remove clutch assemble and retain original clutch
key. Install on replacement compressor.
j. Install compressor in unit by performing the re
moval steps in reverse. It is recommended that
new locknuts be used when replacing compressor.
Install new gaskets on service valves and tighten
bolts uniformly (55 to 80 ft-lbs suction and 20 to
30 ft-lbs discharge service valves).
k. Leak check connections and replace filter-drier.
Refer to paragraph 4.11.
l. Using refrigerant hoses designed for vacuum ser
vice, connect a vacuum pump (see Figure 4-6) and
evacuate compressor to 500 microns. Front seat
both manifold valves to isolate the pump.
m.Open compressor service valves.
n. Start unit and check refrigerant level. Refer to
paragraph 4.8.1.
o. Check compressor oil level. Refer to paragraph
4.15.4. Add or remove oil if necessary.
p. Check compressor unloader operation. Refer to
paragraph 4.15.5
q. Backseat compressor service valves.
r. Remove manifold gauge set. Refer to paragraph
4.4.1.
4.15.2 Transferring Compressor Clutch
To remove a clutch (see Figure 4-14) from a
compressor
and install on
a replacement
compressor, do the following:
1. Compressor
2. Seal Cover
3. Coil
4. Rotor
5. Rotor Nut
6. Armature
7
Spacer Nuts
8. Retaining Capscrew,
Lockwasher, 3/8 Washer
1
2
3
4
5
6
7
8
Figure 4-14 Compressor Clutch
