GMC 1990 Light Truck Repair Manual page 79

1
Shaft Nut
.
2 Clutch Plate and Hub Assembly
.
Puiley Bearing Retainer
3.
4. Pulley Bearing
5. Pulley
6
Clutch Coil Assembly
.
7.
Through Bolts (6)
8 Shaft Seal Retainer Ring
.
9. Shaft Lip Seal
O-Ring Seal
10
.
11
Front Head
.
12 Head Gasket
.
13. Valve Plate (Discharge)
14. Suction Reed Plate
15. Cylinder Seal
16. Front Cylinder
18. Shaft Bearing (2)
19. Thrust Bearing and Races (2)
20
Axial Plate Shaft Assembly
.
21. Shaft Key
Cylinder Seal
2 2
.
23. Rear Seal
24. Cylinder Seal
25. Suction Reed Plate
26. Valve Plate (Discharge)
27. Head Gasket
28. Rear Head
29. Switch Seal
30. System Control Switch
Retainer Ring-Switch
31.
32. High Pressure Relief Valve
33. Seal (O-ring)
A. Important: Shaded parts are not
serviceable and must be replaced as a
; Important
• Do not drive or pound on the clutch hub or the
shaft (20). Internal damage to the compressor
may result.
2. Clutch plate and hub assembly (2) (figure 8).
• Make sure the contact surfaces of the clutch
plate (2) and the pulley (5) are clean.
• Remove the forcing screw tip from J 33013-B
and reverse the body direction on the center
screw.
• Install J 33013-B with bearing (figure 8).
• Back off J 33013-B body enough to allow the
center screw to be threaded against the end of
the compressor shaft.
• Hold the center screw with a wrench and tighten
the hex portion of J 33013-B body while press­
ing the hub onto the shaft. After tightening the
body several turns, remove J 33013-B and
check that the shaft key (21) is properly in place
HR-6 AIR CONDITIONING COMPRESSOR 1B4-3
Figure 4 — HR-6 Component View
in the keyway, then install the clutch plate and
hub assembly (2) to its final position.
• Measure the air gap between contact surfaces
of the clutch plate and hub assembly (2) and the
pulley (5). The gap should be 0.38-0.64 mm
(0.015-0.025-inch) (figure 8).
• Remove J 33013-B.
9
L
Inspect
Position of the shaft (20) (even with or slightly
above the clutch hub).
Use J 33027 to hold the clutch plate and hub
assembly (2).
Tighten
&
Shaft nut (1) to 16 N-m (12 ft. lbs.) with J 33022.
Hand spin the pulley (5) to check for free rota­
tion.
• Remove the assembly from J 33026.