GMC 1976 ZEO 6083 Maintenance Manual page 91

1- 74
AIR CONDITIONING SYSTEM
dicates are in need of service. Refer to Figure 39 and
Figure 40 .
Removal and installation of external compressor
components and disassembly and assembly of inter-
nal components must be performed on a clean work
bench. The work area, tools, and parts must be kept clean
at all times. Parts Tray J-9402 (See figure 72) should
be used for all parts being removed, as well as for
replacement parts.
Although certain service operations can be per-
formed without completely removing the compres-
sor from the vehicle, the operations described herein
are based on bench overhaul with the compressor
removed from the vehicle. They have been prepared
in sequence in order of accessibility of the compo-
nents.
Figure 4 1-Compressor Oil Charge
CAUTION : Do not kink or place excessive
tension on lines or hoses.
When a compressor is removed from the vehicle
for servicing, the amount of oil remaining in the
compressor should be drained and measured . This oil
should than be discarded and new 525 viscosity re-
frigerant oil added to the compressor (See figure 41).
COMPRESSOR CLUTCH
PLATE AND HUB ASSEMBLY
REMOVE
1 . Place Holding Fixture J-9396 in a vise and
clamp the compressor in the Holding Fixture.
UNIT
ADD OIL
CONDENSOR
1
. . . . . . . . . . . . . . . . . . . OUNCE
. . . . . . . . . . . . . . . . . . .
EVAPORATOR
. . . . . . . . . . . . . . . . 3 OUNCES
. . . . . . . . . . . . . . . . . . . . .
COMPRESSOR
AMOUNT OF OIL DRAINED
AMOUNT OF OIL
CONDITION
FROM COMPRESSOR
TO INSTALL
REPLACING COMPRESSOR WITH MORE THAN
- 4 OZ .
*DRAIN NEW COMPRESSOR, REFILL
A NEW COMPRESSOR .
WITH NEW OIL (SAME AMOUNT AS
DRAINED FROM OLD COMPRESSOR) .
LESS THAN - 4 OZ.
**DRAIN NEW COMPRESSOR .
INSTALL NEW OIL IN NEW
COMPRESSOR
- 6 OZ .
REPLACING COMPRESSOR
MORE THAN - 4 OZ .
*SAME AS ABOVE PLUS AN
WITH A SERVICE REBUILT
ADDITIONAL OUNCE (MORE OIL
COMPRESSOR .
IS RETAINED IN A DRAINED
COMPRESSOR THAN ONE THAT HAS
BEEN REBUILT) .
LESS THAN
- 4 OZ . **SAME AS ABOVE PLUS AN
ADDITIONAL OUNCE.
UNABLE TO RUN COMPRESSOR MORE THAN - 1-1 /2 OZ .
*SAME AS ABOVE.
BEING REPLACED, PRIOR TO
REMOVAL .
AND SYSTEM APPEARS TO HAVE
**SAME AS ABOVE.
LOST LITTLE OR NO OIL
LESS THAN
- 1-1 /2 OZ
OR SYSTEM APPEARS TO HAVE
LOST MAJOR AMOUNT OF OIL.
CONTAMINATED OIL DRAINED
ANY AMOUNT
DRAIN AS MUCH OIL AS POSSIBLE
FROM SYSTEM .
FROM SYSTEM . FLUSH SYSTEM
WITH REFRIGERANT-11 . REPLACE
DRIER DESSICANT AND INSTALL NEW
525 VISCOSITY OIL IN NEW
COMPRESSOR :
10-1/2 OZS.
A-4317