Metric Thread Size Information; Unit Repair; Minor Hr6-He Compressor; Repair Procedures - GMC C Series 1993 Repair Manual

and recorded. This oil should then be discarded and an equal
amount of new 525 viscosity refrigerant oil added to the
compressor.
The service compressor is shipped with 240 ml (8 oz.) of
525 viscosity refrigerant oil. This oil should be drained and
retained for replacement oil when service procedures require
addition of new oil to compressor.
Most minor repair procedures may be done on the
vehicle without discharging the system. Major repair
procedures require that the system be discharged of refrigerant.
M INO R H R 6 -H E CO M PRESSO R

REPAIR PROCEDURES

THE FOLLOWING OPERATIONS TO THE HR6-HE
COMPRESSOR CLUTCH PLATE AND HUB, ROTOR
AND BEARING, AND COIL ARE COVERED AS
"MINOR" BECAUSE THEY MAY BE PERFORMED
WITHOUT FIRST RECOVERING
FROM THE SYSTEM
COMPRESSOR FROM THE VEHICLE.
, The Compressor Shaft Seal assembly, control switches,
and Pressure Relief Valve may also be serviced WITHOUT
REMOVING THE compressor from the vehicle but these
operations are covered later in this section as MAJOR REPAIR
PROCEDURES because the system must be reclaimed,
evacuated and recharged to complete service:
Illustrations used in describing these operations show the
compressor removed from the vehicle only to more clearly
illustrate the various operations.
When servicing the compressor, remove only the parts
that preliminary diagnosis shows are in need of service. Refer
to Figures 2 and 5 for information relative to part names and
location.
Removal and installation of external compressor parts,
and disassembly and assembly of internal parts, must be
performed on a clean workbench. The work area, tools and
parts must be kept clean at all times.
COMPRESSOR CLUTCH PLATE AND HUB
ASSEMBLY
El
Remove or Disconnect
Clamp the holding fixture J 33026 in a vise and attach
compressor to holding fixture , with thumb screws
J 33026-1 (Fig. 3).
With center screw forcing tip in place to thrust against
the end of the shaft, thread the Clutch Plate and Hub
Assembly Installer-Remover J 33013-B into the hub.
Hold the body of the remover with a wrench and turn the
HR6-HE AIR CONDITIONING COMPRESSOR 102^3

UNIT REPAIR

REFRIGERANT
OR REMOVING THE
"

METRIC THREAD SIZE INFORMATION

l . Compressor to mounting bracket bolts.
Front MIO x 1.5-6H
Rear M8 x 1.25 - 6H
, 2. Suction-discharge port screw.
, MIO x 1.5 -6 H
3. Compressor shaft.
M9 x 1.25-6H
4. Internal hub-clutch drive assembly.
. M22 x 1.5-6H
center screw into the remoVer body to remove the Clutch
plate and hub assembly (Fig..3).
NOTICE: Do not drive or pound on the clutch hub or
shaft. Internal damage to compressor may result. The
forcing tip on J 33013-B remover-installer center screw
must be flat or the end of the shaft/axial plate assembly
will be damaged.
3. Remove the shaft key and retain for reassembly.
B
Install or Connect
1. Install the shaft key into the hub key groove (Fig. 4).
Allow the key to project approximately 3.2mm (1/8")
out of the keyway. The shaft key is curved slightly to
provide an interference fit in the hub key groove.
2. Be sure the frictional surface of the clutch plate and the
clutch rotor are clean before installing the clutch plate
and hub assembly.
3. Align the shaft key with the shaft keyvyay and place the
clutch plate and the hub assembly onto, the compressor
shaft.
m
J 33013-B HUB AND
y
CLUTCH DRIVE PLATE
ASM. REMOVER
[7]
J 33026-1 THUMB
SCREW
Fig. 3 Clutch Plate and Hub Assembly Removal
IT ]
J 33026 HOLDING
FIXTURE
CLUTCH PLATE
AND HUB ASM.
G60070-1D2-C-R1