GMC T Series 1994 Repair Manual page 27

HR100T/HR110-MD AIR CONDITIONING
NOTICE:
W hen fasteners are rem oved, alw ays reinstall them at the same location from w hich they w ere rem oved. If a
fastener needs to be replaced, use the correct part num ber fastener for that application. If the correct part num ber fastener is not
available, a fastener of equal size and strength (or stronger) may be used. Fasteners that are not reused, and those requiring thread
locking com pound will be called out. The correct torque value m ust be used when installing fasteners that require it. If the above
conditions are not follow ed, parts or system dam age could result.
G eneral D e s c rip tio n ........................................
Service P ro c e d u re s..........................................
M inor Repair Procedures
C o m p re s s o r .............................................
Com pressor Clutch Plate and Hub
A ssem bly — 4 Pole — 6 Pole Clutch
Com pressor Rotor and/or Bearing —
V-Groove — 4 Pole Clutch ..............
Clutch Rotor and/or Bearing —
6 Pole Clutch ........................................
Vehicles using the H R 100T and
conditioning com pressor may
installations in their m ounting brackets, drive system s, pulleys,
connector assem blies and system capacities, none of which
w ill affect the follow ing O verhaul Procedures.
There are tw o (2) com pressor clutch driver designs
w hich will affect the overhaul procedure to be used. The four
(4) pole clutch (Fig. 1) and the 6 pole clutch (Fig. 3) m ust be
identified prior to starting overhaul procedure.
W hen servicing the com pressor, it is essential that steps
be taken to prevent dirt or foreign m aterial from getting on or
into the com pressor parts and system during disassem bly or
reassem bly. Clean tools and clean work area are very im portant
for proper service. The com pressor connection areas and the
exterior of the com pressor should be cleaned off as m uch as
possible prior to any "on-vehicle" repairs or removal o f the
com pressor for w orkbench service. The parts m ust be kept
clean at all tim es and any parts to be reassem bled should be
cleaned w ith trichloroethane, naphtha, Stoddard solvent,
kerosene or equivalent solvent and blow n dry with dry air.
W hen necessary to use a cloth on any part, it should be o f a
non-lint producing type.
The operations described in this m anual are based on
bench overhaul w ith the com pressor rem oved from the vehicle.
However, som e service
accessibility o f the com pressor, may be perform ed without
rem oving the com pressor from the vehicle. These on-vehicle
operations are also identified in this manual.
SECTION 1D1
COMPRESSOR
CONTENTS
ID 1-1
1D 1-3
ID 1-3
1D 1— 3
1D 1— 5"
1D 1-6
GENERAL DESCRIPTION
H R 110-M D air
have differences between
operations depending on
Com pressor Clutch Coil and/or
Pulley Rim — 4 Pole & 6 Pole C lu tc h .................1D 1-8
Major Repair Procedures
Com pressor Shaft Seal ...........................................1D 1— 10
Com pressor Pressure R elief Valve ..................... 1D 1-12
Com pressor Control S w itc h e s ...............................1D 1-12
Com pressor Leak Testing
(External and I n te r n a l) ...........................................1D 1-12
Com pressor Overhaul
Special Tools ...........................................................1D 1-14
Fig. 1 Compressor, V-Groove Pulley Type with 4 Pole Clutch
and Driver Shown
All replacement com pressors will be shipped from
Harrison with 8 oz. of oil. W hen the com pressor is rem oved
from the vehicle for servicing, drain oil from both the defective
compressor and the new replacem ent com pressor. M easure the
amount removed from the defective com pressor: if less than 1
oz. (30 ml) is drained from the old com pressor, add 2 oz. (60 ml)
to the new compressor. If m ore than 1 oz. (30 ml) is drained
from the old com pressor, add the sam e am ount to the new
compressor.