GMC 1976 ZEO 6083 Maintenance Manual page 92

HOLDING
FIXTURE
J-9396
CLUTCH
ASSEMBLY
THINWALL
SOCKET
1-9399
CLUTCH HUB
HOLDING TOOL
J-25030 O R
J-9403
Figure 42-Removing Shaft Locknut
2. Keep clutch hub from turning with Clutch
Hub Holder J-25030 or J-9403, and remove locknut
from end of shaft using Thin Wall Socket J-9399
(figure 42).
CAUTION :
To avoid internal damage to the
compressor, DO NOT DRIVE OR
POUND on the Clutch Plate and Hub as-
sembly OR on the end of the shaft. Ifproper
tools to remove and replace clutch parts are
not used, it is possible to disturb theposition
of the axial plate (keyed to the main shaft),
resulting in compressor damage and seal
leakage due to shifting of the crankshaft.
4. Remove square drive key from shaft or drive
plate hub.
Figure 43-Removing Clutch Plate and Hub Assembly
AIR CONDITIONING SYSTEM
1- 7 5
Figure 44-Removing or Installing Retainer Ring in
Clutch Drive Plate
5. Remove hub spacer retainer ring using Snap-
Ring Pliers J-5403(#21), and then remove hub
spacer (figure 44).
6. Inspect driven plate for cracks or stresses in the
drive surface. Do not replace driven plate for a scor-
ing condition. (figure 45) .
If the frictional surface shows signs of damage
due to excessive heat, the clutch plate and hub and
pulley and bearing should be replaced . Check further
for the underlying cause of the damage (i .e . low coil
voltage - coil should draw 3.2 amps at 12 volts - or
binding of the compressor internal mechanism,
clutch air gap too wide, broken drive plate to hub
assembly springs, etc.
REPLACE
1 . Insert the square drive key into the hub of
driven plate; allow it to project approximately 3/16"
out of the keyway .
2. Line up the key in the hub with keyway
in the
shaft (figure 46).
3. Position the Drive Plate Installer J-9480-1 on
the threaded end of the shaft. The Spacer J-9480-2
should be in place
under
the hex nut on the tool . This
tool has a left hand thread on the body . (figure 47).
4. Press the driven plate onto the shaft until there
is approximately 3/32" space between the frictional
faces of the clutch drive plate and pulley .
CAUTION :
Make certain key remains in
place when pressing hub on shaft.