GMC 1976 ZEO 6083 Maintenance Manual page 484

7- 3 6 TRANSMISSION
Make certain that stepped gauge pin is free to move
up and down in both tool and servo pin bore . Stepped
side of pin must face rear of transmission case .
Band apply pins are available in three sizes as
shown in the following chart :
Identification ring is located on band lug end of
pin. Selecting the proper pin is equivalent to adjust-
ing band .
4. To determine proper size pin to use, apply 25
foot-pounds torque on hex nut on side of gauge. This
will cause lever on top of gauge to depress stepped
gauge pin into servo pin bore, simulating actual oper-
ating conditions . Note relation of steps on gauge pin
and machined surface on top of gauge. Determine
proper size pin as follows:
a. If machined surface on top of gauge is even
with or above upper step on gauge pin, long size pin
(three rings) is required.
b. If machined surface on top of gauge is
between steps on gauge pin, medium size pin (two
rings) is required .
c. If machined surface on top of gauge is even
with or below lower step on gauge pin, short size pin
(one ring) is required.
5 . If new pin is required, make note of pin size
required, and remove gauge from transmission case .
REMOVE DETENT LEVER,
MANUAL SHAFT, AND PARKING
LINKAGE (FIGURE 30)
NOTE :
Units may be removed with transmission
in vehicle after removing bottom pan and detent
roller and spring assembly from control valve
assembly.
1 . Remove pin securing manual shaft to case by
pulling straight out, (Be careful not to damage the
case or pin).
2 . Loosen locknut securing detent lever to
manual shaft.
3. Pry or work detent lever loose from ground
flats on manual shaft.
4. Remove manual shaft from case bore and
remove and discard O-ring seal from manual shaft.
NOTE :
Be careful not to drop jam nut inside of
case .
5. Remove detent lever and parking brake actua-
tor assembly from case and remove actuator assem-
bly from detent lever.
6. Remove parking brake bracket attaching
screws and remove bracket.
7. Remove retainer pin securing parking pawl
shaft to transmission case by pulling straight out.
8. Remove parking pawl shaft, parking pawl and
return spring .
REMOVE SPROCKET COVER, LINK
ASSEMBLY, DRIVE AND DRIVEN
SPROCKETS
1. Remove eighteen cover attaching screws.
2. Remove cover and gasket and discard gasket.
3. Install Snap Ring Pliers, J-4646, into sprocket
bearing retaining snap rings located under the drive
and driven sprockets, and remove snap rings from
retaining grooves on support housing, Figure 31.
RETAINER
JAM NUT-*
PIN
DETENT LEVER
AND PARKING
BRAKE ACTUATOR -
ASSEMBLY
DETENT ROLLER AND
SPRING ASSEMBLY
0-O-RING SEAL
A-2156
Figure 30-Manual and Parking Linkage
Identification Length
Three Rings . . . . . . . . . . . . . . . . Long
Two Rings . . . . . . . . . . . . . . . . . . Medium
One Ring . . . . . . . . . . . . . . . . . . . . Short