GMC S Series 1994, Repair Manual

Page: 29 / 919

SERVICE PROCEDURES
MINOR REPAIR PROCEDURES,
HR100T & HR110-MD
COMPRESSOR
THE F O L L O W . O P E R A T I O N S TO THE
COMPRESSOR CLUTCH PLATE AND HUB, ROTOR
AND BEARING, AND COIL & PULLEY RIM ARE
COVERED AS “M INO R” BECAUSE THEY MAY BE
PERFORMED WITHOUT FIRST PURGING THE
SYSTEM OR REMOVING THE COMPRESSOR FROM
THE VEHICLE.
Two types o f drive system s are used on the C om pressor:
V-groove type and poly-groove type. The drive system affects
only m inor repair procedures and is so noted where required.
M ajor repair procedures are not affected by the type o f drive
system .
Fig. 3 Compressor, Poly-Groove Pulley Type with 6 Pole
Clutch and Driver Shown
1 -S U C T IO N
PORT
2 -S E A L IN G
W ASHER
3 -D IS C H A R G E
PORT
4 -H IG H Ollf
PRESSURE
RELIEF
5 - J 2 5 0 0 8 -A
HO LDING
FIXTURE
520007-1D1-R1
Fig. 4 Com pressor In Holding Fixture
The C om pressor Shaft Seal assem bly, and Pressure
R elief Valve m ay also be serviced W IT H O U T REM O V IN G
T H E C O M P R E S SO R from the vehicle but these operations are
covered
later in this section as M A JO R REPAIR
PR O C E D U R E S because the refrigerant system m ust be
reclaim ed, evacuated and recharged to com plete service.
Illustrations used in describing these operations show the
com pressor rem oved from the vehicle only to m ore clearly
illustrate the various operations.
W hen servicing the com pressor, rem ove only the
necessary com ponents that prelim inary diagnosis indicates are
in need o f service. Refer to F igure 2 for inform ation relative to
parts nom enclature and location.
Removal and installation o f external com pressor
com ponents must be perform ed on a clean w orkbench. The
work area, tools and parts m ust be kept clean at all tim es.
1 - J-33013-B HUB AND
CLUTCH D R IV E
PLATE ASSEM BLY
REM O VER
2 -C L U T C H PLATE A N D
HUB ASSEM BLY
520009-1D1-R1
Fig. 5 Clutch Plate & Hub Asm. Removal
COMPRESSOR CLUTCH PLATE AND HUB
ASM — 4 POLE AND 6 POLE CLUTCH
Remove or Disconnect
If com pressor is on the vehicle, loosen com pressor
m ounting brackets, disconnect the com pressor drive belt
and reposition the com pressor for access, if necessary.
If com pressor has been rem oved from the vehicle, attach
the com pressor to H olding Fixture J 2 5 0 0 8 -A and clam p
the Holding Fixture in a vise (Fig. 4).
1 -C LU TC H
PLATE
AND HUB
ASSEMBLY
2 -C L U T C H
ROTOR
3 -S H A FT
KEY
4 -J 25008-A
HOLDING
FIXTURE
520010-1D1-R1