GMC 4000 Series Service Manual page 449

Sec. 7A
Page 438
TRANSMISSION CONTROL LINKAGE
Figure 6 — M a n u a l Shift Linkage (Typical All Models)
MANUAL SELECTOR LINKAGE
ADJUSTMENT (Refer to Fig. 6)
The transm ission shift control linkage should
fully engage all transmission range positions,
Figure 7 — Retarder Slave Cylinder
(Tilt C ab M odels)
G M C S E R V I C E M A N U A L
" R, N, 3-6, 3-5, 3-4, and 1-2," just before the
lever hits the " stops" incorporated in the shift
control cover. Shift selector lever through each
position while feeling for full engagement in
transm ission. Note the position of selector lever
after each shift. Transmission should not engage
" 3-6" or " R" (Reverse) until selector lever is
completely out of the neutral notch. If the lever
is not properly located or operating, adjust link­
age as follows:
against stop in " 3-6" position.
A-A, and adjust if necessary. Anchor cable to
bracket at point (D).
tends 0.88 inch above top-side of bracket, as
shown at point (D).
lever (H). Anchor cable (E) securely at point (F).
position (3rd notch from the rear). Adjust clevis
(G) for free-entry of clevis pin through clevis and
manual shift lever (H). Then lengthen clevis (G)
by 1-1/2 turns, install clevis pin, tighten jam nut,
and secure with cotter pin.
vehicle and check operation of selector lever
through all shift ranges. Readjust if necessary.
NEUTRAL SAFETY AND BACK-UP LIGHT
SWITCH ADJUSTMENT (Refer to Inset, Fig. 6)
ment" should be performed as described previ­
ously, prior to adjustment of the neutral safety
switch.
perform the following to prevent the vehicle from
accidentally starting while performing adjustment:
out of center socket in distributor cap and ground
wire to prevent possible damage to coil.
off lever in " SHUT-OFF" position.
then referring to Inset, fig. 6, loosen jam nuts and
adjust length of push rod to dimension shown.
tighten jam nuts securely.
to make sure the starter does not operate with
the selector lever in any position other than "N ."
Have assistant check for proper operation of
back-up lights with selector lever in " R."
necessary, readjust switch.
cap, on gas engine models.
1. Locate transmission
2. Check cable for dimension shown in View
NOTE: Threaded portion of shift cable ex­
3. Disconnect clevis (G) from manual shift
4. Locate manual shift lever (H) in " 3-6"
5. After completing all adjustments, operate
NOTE: " Manual Selector Linkage Adjust­
1. Block wheels, apply parking brake, and
a. Gas Engine Models - Pull secondary wire
b. D iesel Engine Models - Place fuel shut-
2. Move lever (B) to " N" (Neutral) position,
3. With switch push rod properly adjusted,
4. Check each range position of shift linkage
5. Reconnect secondary wire to distributor
selector lever (B)
If