GMC T Series 1994 Repair Manual page 29

MINOR REPAIR PROCEDURES,
HR100T & HR110-MD
COMPRESSOR
THE F O L L O W . O P E R A T I O N S
COMPRESSOR CLUTCH PLATE AND HUB, ROTOR
AND BEARING, AND COIL & PULLEY RIM ARE
COVERED AS "MINOR" BECAUSE THEY MAY BE
PERFORMED WITHOUT
SYSTEM OR REMOVING THE COMPRESSOR FROM
THE VEHICLE.
Two types of drive system s are used on the Com 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
PRESSURE
RELIEF
5 -J 2 5 0 0 8 -A
HO LDING
FIXTURE
Fig. 4 Compressor In Holding Fixture
The C om pressor Shaft Seal assembly, and Pressure
R elief Valve may also be serviced W ITH O U T REM O V ING
TH E CO M PR ESSO R from the vehicle but these operations are
covered later in this section
PRO CED U R ES 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 more clearly
illustrate the various operations.
SERVICE PROCEDURES
TO THE
FIRST PURGING THE
Ollf
520007-1D1-R1
as M A JO R REPAIR
W hen servicing the com pressor, rem ove only the
necessary com ponents that prelim inary diagnosis indicates are
in need of service. Refer to Figure 2 for inform ation relative to
parts nomenclature and location.
Removal and installation
components must be perform ed on a clean workbench. The
work area, tools and parts m ust be kept clean at all times.
1 - J-33013-B HUB AND
CLUTCH D R IV E
PLATE ASSEMBLY
REM OVER
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
mounting 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 250 0 8 -A and clam p
the Holding Fixture in a vise (Fig. 4).
1 -CLUTCH
PLATE
AND HUB
ASSEMBLY
2 -C LU TC H
ROTOR
3 -S H A FT
KEY
4 -J 25008-A
HOLDING
FIXTURE
o f external com pressor
2 -C L U T C H PLATE A N D
HUB ASSEM BLY
520009-1D1-R1
520010-1D1-R1