4-15
©
2012 Mobile Climate Control
T-348 Rev. 07/2012
4.15.2 Transferring Compressor Clutch (Continued)
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 special tool (MCC P/N 07-00240-01) 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 tool (MCC P/N 07-00240-01) as in
step a. to prevent 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 of torque.
j. Install armature on shaft using original key and
tighten mounting bolt to 20 ft/lbs (2.8 mkg).
k. 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 (3.4 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). If required, remove the six armature
spacer nuts and spacer. Add or remove shims to
adjust gap. Reinstall spacer nuts and tighten to 7-8
ft/lbs (1.0 to 1,1 mkg).
l.Reconnect wiring and test clutch operation.
4.15.3 Shim-less Compressor Clutch
As of February 4, 2008 all 05G and 05K compressor
clutches supplied by MCC and built by Warner
Electric will have an upgraded armature plate
installed. This new armature plate will eliminate the
need for separate shims. The shim pack has been
replaced by three adjusting screws installed on the
spring plate of the armature. Armature to rotor
clearance will stay the same (.030”-.060”) but the
procedure to adjust will be different from original
shim
style
clutch.
Clutch
assemblies
are
interchangeable. The clearance is factory set on each
clutch, but should the need arise to adjust the clutch
gap the following procedure should be followed.
Three Point Clutch Adjustment Procedure
a. Confirm the clutch electrical circuit can not be en
ergized while you are working on clutch.
WARNING
Battery disconnect should be off.
b. With a .045” feeler gauge check the clearance at the
three set screws and determine what adjustment
needs to be made. Clearance is to be .045” +-
.015”.
c. With a 1/8” hex socket wrench and a 7/16” box
wrench to hold the locking nut, back off the three
set screws until they do not contact the armature
plate.
d. Turn the set screws CW until they just make con
tact with the armature plate. Adjust clockwise one
and one half turns after contact. One and one half
turns equals approximately .040”.
e. Measure the initial clearance after the one and one
half turns CW and adjust for a clearance between
.030” and .060”. All three set screw locations
should be very close in clearance dimensions.
f. When clearance is set lock the adjusting screws
with the nuts torqued to 7 foot pounds. You will
need to hold the hex socket adjusting screw while
torquing the lock nut.
NOTE
Setting clearance is done with 50 psig in the compres
sor due to the crankshaft movement when charged. If
there is not 50 psig in the compressor when the clear
ance is set the clearance should be set on the lower
end of the tolerance to allow for crankshaft move
ment when charged. Check clearance again after com
pressor is pressurized.
g. Reconnect battery wiring and test clutch opera
tion.
