GMC 1976 ZEO 6083 Maintenance Manual page 483

Figure 27-Removing Control Valve Spacer
8 . Remove control valve spacer and spacer-to-
transmission case gasket, Figure 27 .
CAUTION :
If control valve is removed in
vehicle, seven check balls will come down
with spacer .
9. Remove seven check balls from cored passages
in transmission case, Figure 28 .
NOTE:
The eighth check ball is held in by a re-
tainer and should not be removed unless replace-
ment is required .
10 . Remove electrical connector from case . Dis-
card "O" ring from connector.
REMOVE FRONT SERVO PISTON
AND REAR SERVO PISTON
NOTE :
Units may be removed with transmission
Figure 28-Location of Check Balls
TRANSMISSION 7- 3 5
in vehicle after removing bottom pan and con-
trol valve assembly .
1 . Lift front servo piston retainer ring, pin, spring
retainer and spring out of transmission case, Figure
28 .
2. Remove rear servo assembly from transmis-
sion case, Figure 28 .
3 . Remove rear servo accumulator spring .
4. Make band apply pin selection check to deter-
mine proper size pin to use at time rear servo is
assembled. Proceed as described in the following.
BAND APPLY PIN SELECTION
CHECK (FIGURE 29)
NOTE:
Check may be made with transmission in
vehicle. Remove bottom pan, control valve as-
sembly, and rear servo.
1 . Position Adapter Plate, J-21370-8, on trans-
mission case over rear servo bore, and, using screws
provided with Adapter Plate, attach Band Apply Pin
Selector Gauge, J-21370-6 to Adapter Plate.
2. Position Band Apply Pin Selector Gauge, J-
21370-6, with hex nut on side of gauge facing toward
converter housing, and smaller diameter end of
Gauge Pin, J-21370-7, in servo pin bore .
3 . Secure Adapter Plate to transmission case with
two 5/16-18 x 1 inch screws, tightening screws to 18
foot-pounds and secure Selector Gauge to Adapter
Plate, tighten attaching screws to 18 foot-pounds.
Figure 29-Checking Rear Band Apply Pin Length