4-18
©
2015 Mobile Climate Control
T-367 Rev. 05/2015
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.
l. Using refrigerant hoses designed for vacuum ser
vice, connect a vacuum pump (see Figure 4-13)
and evacuate compressor to 500 microns.
m. Open compressor service valves.
n. Start unit and check refrigerant level (refer to para
graph 4.7).
o. Check compressor oil level (refer to paragraph
4.14.6). Add or remove oil if necessary.
p. Check compressor unloader operation.(refer to
paragraph 4.14.7)
q. Backseat compressor service valves.
r. Remove manifold gauge set (refer to paragraph
4.4.1 ).
4.14.5 Transferring Compressor Clutch
To remove a clutch (see Figure 4-16) from a
compressor
and install on
a replacement
compressor, do the following:
8
1
2
3
4
6
7
5
1.
Compressor
2.
Seal Cover
3.
Coil
4.
Rotor
5.
Rotor Nut
6.
Armature
7.
Spacer Nuts
8.
Retaining Capscrew,
Lockwasher, 3/8 Washer
Figure 4-16. Compressor Clutch
a. Place main battery disconnect switch in OFF posi
tion and lock.
b. Tag and disconnect wiring to the clutch.
c. Remove tension on drive belts, remove drive belts.
d. Remove the armature as a complete assembly by
removing the retaining capscrew, lockwasher, and
special 3/8 washer from the compressor crank
shaft. Use spanner wrench to prevent crankshaft
rotation.
e. Install a 7/8-14 x 4” (MCC P/N 07-00381-00)
capscrew into the center hole of the armature as
sembly and use it as a jacking bolt to remove the
armature. Use spanner wrench as in step d. to pre
vent crankshaft rotation.
f.Using special tool (MCC P/N 07-00242-01), re
move the rotor nut and rotor. Retain original key.
g. Noting the position of the wire, remove the three
bolts holding the coil to the compressor.
h. Remove every other bolt from the seal cover of the
new compressor in the same manner as the origi
nal compressor. Mount the coil assembly with the
wire in the same orientation as it was mounted on
the original compressor. Tighten the mounting
bolts to 45-50 ft/lbs (5.53-6.92 mkg).
i. Mount the rotor on the shaft. Seat the rotor to the
hub, using the rotor nut. Be sure pulley turns freely
without binding. Tighten rotor nut by first noting
torque necessary to start the nut on the hub and
then adding 50 ft/lbs (6.92 mkg) of torque.
4.14.5.a 3-Point Shim-less Compressor Clutch
a. Install armature on shaft using original key and
tighten mounting bolt to 20 ft/lbs (2.8 mkg).
b. Perform a check of the air gap between the inside
face of the armature and the mating face of the ro
tor. The air gap should be measured with a mini
mum of 50 psig (3.44 bar) in the crankcase. A pre
liminary check may be performed before the
crankcase is pressurized but a final check must be
performed before the clutch is operated. The gap
should be between 0.030 and 0.060 inch (7.62 to
15.24 mm).
c. Loosen each of the three lock-nuts with a 7/16”
box wrench while holding the jacking screws with
a 1/8” hex socket wrench.
d.Back off the three jacking screws until they do not
touch the armature plate.
e. Turn the jacking screws clock-wise until they make
contact with the armature plate and then one and
one half more turns after contact.
f. Measure the initial clearance, the gap should be
between .030” and .060”. All three set screw loca
tions should be very close in clearance dimensions.
