GMC 1976 ZEO 6083 Maintenance Manual page 512

7- 64 TRANSMISSION
3 . Inspect band apply pin for scores or cracks .
4. Inspect band apply pin for proper size as deter-
mined by pin selection check .
ASSEMBLE REAR SERVO
1 . Install spring retainer, cup side first, servo pin
spring and washer on servo pin.
2 . Install servo piston on pin and secure with
E-ring retainer .
3. If removed, install oil seal ring on servo piston .
4. If removed, install inner and outer oil rings on
accumulator piston .
5 . Install accumulator piston into bore of servo
piston .
INSTALL REAR SERVO
NOTE :
If the transmission is in the vehicle, a
sheet metal bracket will be required to hold the
rear servo assembly, front servo assembly, check
balls, valve body to spacer plate gasket and valve
body spacer plate, until the control valve assem-
bly is installed. See Figure 95 .
1 . Lubricate inner and outer rear servo bores in
transmission case with transmission fluid and install
rear accumulator spring in servo inner bore .
NOTE :
Before installing rear servo assembly,
make certain that rear band apply lug is aligned
with servo pin bore in transmission case . Other-
wise servo pin will not apply band .
OCATE BRACKET ON EDGE
I~
F FRONT SERVO PISTON
O FRONT ACCUMULATOR
ISTON CAN ENTER BORE
Figure 95-Spacer Plate Holding Bracket
TEFLON OIL SEAL RING
Figure 96-Front Servo Components
2. Position rear servo assembly in transmission
case bore .
3. Press down on rear servo assembly, making
certain oil seal ring is properly seated in case bore .
INSPECT FRONT SERVO
NOTE :
See Figure 96 . Do not remove the teflon
oil seal ring from the front accumulator piston
unless the oil seal ring requires replacement. For
service, the oil seal ring will be aluminum .
IMPORTANT:
The spring retainer, servo pin, re-
taining ring, and servo piston for 1971 thru 1976
are not interchangeable with pre-1971 parts.
1 . Inspect servo pin for damage .
2. Inspect piston oil ring for damage .
3. Inspect piston for cracks or porosity .
4. Check fit of servo pin in piston .
INSTALL FRONT SERVO ASSEMBLY
Reassemble parts of front servo, making sure ta-
pered end of servo pin is pointed through the spring
and spring retainer, and install in bore in case . Make
sure the retainer ring is installed in the servo pin
groove .
NOTE :
The teflon ring allows the front servo pis-
ton to slide very freely in the case . The free fit
of the ring in the bore is a normal characteristic
and does not indicate leakage during operation.
The teflon ring should only be replaced if it
shows damage or if evidence of leakage during
operation exists .