GMC 4000 Series Service Manual page 443

Sec. 7A
Page 432
TRANSMISSION CONTROL LINKAGE
1 Boot Retainer
2 Boot
3 Selector Finger Pin
4 Control Cover
5 Pivot Screw
6 Shift Rod
7 Selector Rod
8 Adjustable Clevis
Figure 2 — C ontrol Is la n d Shift M e c h a n ism
NOTE: Adjustment of the selector and shift
rods is accomplished by disconnecting the rods
at the control island or transmission, depending
on the location of the adjustable clevis (see Inset,
fig. 1). Rotate the adjustable clevis on each rod
to the desired position, then reconnect the rods
to the control island or transmission. Tighten
lock nuts firmly.
3. Check adjustment
lever through the shift pattern. There must be no
binding in the linkage.
NOTE: At the extreme selector and shift
movements, clevis pins should rotate freely.
Readjust linkage, if necessary, to obtain these
conditions.
4. Replace any worn or damaged cotter pins.
5. Lubricate control linkage as described in
LUBRICATION (SEC. 0) of this manual.
CONTROL ISLAND SHIFT MECHANISM
On tilt cab models with New Process trans­
m ission, if shift controls on control island become
worn or damaged, make repairs as described in
the following text:
NOTE: The control island shift mechanism
used with either Corporation or New Process
G M C S E R V I C E M A N U A L
9 Selector Finger
10 Shift Finger
11 Selector Finger Strap
and Pin Assembly
12 Roll Pin
13 Pivot Pin
14 Gearshift Lever
by moving gearshift
transm issions is b a s i c a l l y
construction.
REMOVAL
NOTE: Key numbers in following text refer
to figure 2.
1. At the control island panel, disconnect
shift rod (6) from shift finger (10). Also, discon­
nect selector rod (7) from selector finger (9).
2. Remove shift mechanism assem bly-to-
control island panel attaching parts and then
remove assembly from vehicle.
3. Remove gearshift knob, boot retainer (1)
and boot (2).
DISASSEMBLY
NOTE: Key numbers in following text refer
to figure 2.
1. Remove cotter pin and washer from se le c ­
tor finger pin (3), then remove selector finger (9).
2. Remove lockwires from pivot screw s (5),
then remove pivot screws, washers and selector
finger strap and pin assembly (11).
3. Remove gearshift lever (14).
4. Using hammer and punch, remove roll pin
(12), pivot pin (13), and then remove shift finger
(10) from control cover (4).
CLEANING AND INSPECTION
1. Clean all parts thoroughly in cleaning
solvent. Wipe or blow parts dry.
2. Check all parts
cracks, or other damage.
3. Replace all parts that would affect proper
selection of transmission gears.
ASSEMBLY
NOTE: Key numbers in following text refer
to figure 2.
1. Place gearshift lever on shift lever finger
(10) and position in control cover. Install pivot
pin (13) and roll pin (12).
2. Install selector finger strap and pin a s­
sembly (11), washers and two pivot screws (5).
Torque screw s to 60-65 foot-pounds and install
new lockwires to pivot screws.
3. Install selector finger pin (3), selector
finger (9), washer and new cotter pin.
INSTALLATION
NOTE: Key numbers
figure 2.
1. Install boot (2), boot retainer (1) and gear­
shift knob to shift mechanism assembly.
2. Place shift assembly in proper position
on control island and install attaching parts.
3. Connect shift control linkage to selector
finger (9) and shift finger (10), then adjust con­
trol linkage as covered previously under " Linkage
Adjustment" procedures.
the same in
for wear, distortion,
in text refer to