MCi Crusader II 1989 Maintenance Manual page 507

Date
1-1-89
Page
16-37
MC-9 MAINTENANCE MANUAL
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Figure 16-51: Capscrew Removal
5. Remove the retaining capscrew, lock washer and flat
washer from compres~or crankshaft.
6. Install a ¾-14 x 2" (51 mm) capscrew into the center
hole of the armature. Use this capscrew as a jacking bolt to
draw the armature from the compressor crankshaft. Secure
armature with tool 20-296, as in step
4.
See figure 16-52.
CAUTION: Do not use a puller or pry bar
against the armature or the end plate. To
"- · do so will cause damage to the armature
assembly.
Figure 16-52: Armature Removal with Jacking Bolt
7. Remove the armature (figure 16-53).
CAUTION: The requirement to remove
the armature in order to grease the clutch
bearing is to provide a means to clean
excess grease from the clutch faces. This
reduces the potentlal for clutch slippage,
damage, and reduced torque transmis-
sion to the compressor. Modification of
the clutch or the procedure to grease the
bearing is unauthorized and will void the·
warranty covering the clutch and com-
pressor.
Figure 16-53: Armature Removal
8. Wipe the grease fitting clean of all dirt and foreign
material.
9. Using a manua~ grease gun with an approximate 0.1
oz. (2.835 g) delivery per stroke, insert 1 ounce of grease
into bearing. Grease must be Chevron SR1-2.
CAUTION: Do not give extra grease to the
bearing "for good measure." Excess
greasing
will
cause clutch slippage, over-
heated clutch parts and ·clutch failure.
10. Wipe all grease spills from clutch faces, retaining nut,
hubs and washers. Use a clean cloth dampened in degreas-
ing agent trichloroethane to clean clutch faces.
11. Install armature, flat washer, lock washer and arma-
ture retaining capscrew on compressor crankshaft. Tighten
capscrews to 16-20 lb.-ft. (22-27 Nm) torque.
12. Connect coil electrical lead, install drive belts and
close two-way manual air valve.
Every 50,000 miles (80,000 km) clutch face wear should
be measured according to the following procedure:
CAUTION: Clutch coll must be de-ener-
gized. If this procedure is done with the
clutch mounted to the compressor while
installed In the coach, ensure the engine
starter cannot be engaged.
13. Using a depth microm~ter, measure and record the
distance from the back of the armature to the face of the
rotor (air gap). See figure 16-48.
14. Disconnect the clutch coil electrical connector.
Ground one connector terminal and connect 24 VDC to the
other terminal to energize the clutch coil.
15. Repeat step 13 for the measured distance when the
armature and rotor faces are engaged.
16. Determine the difference between the two measure-
ments. If the difference exceeds .110" (2.794 mm), the
clutch rotor and armature require replacement. Proceed to
Removal and Disassembly, below.
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