GMC 4000 Series Service Manual page 459

Sec. 7D
Page 448
CLUTCH CONTROLS
MECHANICAL LINKAGE ADJUSTMENTS
All Models Except PS4500
(Refer to Figs. 1 and 2)
1. Disconnect the
spring.
2. Move the release fork to a position where
the release bearing can be felt to just barely
contact the clutch release fingers.
3. Adjust clearance between wedge and re­
lease fork as described below:
a. On all vehicles with V-6 engines, adjust
the length of push rod at adjusting nut to give a
clearance of 5 /8 -inch between wedge and release
fork.
b. On vehicles with In-line engines, adjust
the length of push rod at adjusting nut to give a
clearance of 1 /4 -inch between wedge and release
fork.
4. Connect pull-back spring to the release
fork, then check operation of clutch linkage.
PS450Q Linkage Adjustment
NOTE: Key letters in text refer to fig­
ure 4.
1. Disconnect return spring and loosen nuts
(A) and (B).
G M C S E R V I C E M A N U A L
MECHANICAL LINKAGE CONTROLS
release fork pull-back
Figure 3 — M ech a n ical Clutch Linkage (PS4500)
2. Apply approximately 5 pounds force to
the push rod in direction of arrow (E) to eliminate
clearance between release bearing and internal
release levers.
3. Move idler lever (D) in direction of arrow
(G) until pedal makes contact with stop.
IDLER LEVER A N D SHAFT
ASSEMBLY REPLACEMENT
REMOVAL (Refer to Figs. 1, 2, and 5)
1. Disconnect pull-back spring.
2. Disconnect relay rod and push rod from
idler lever and shaft assembly.
3. Remove lock washer and nut (11, figure 5)
and lock strap (10) from ball stud.
4. Slide the outer end of lever and shaft a s­
sembly (7) with ball stud forward and up following
the slot in frame bracket.
5. Pull lever and shaft assembly away from
the engine mounted ball stud.
6. Remove the engine mounted ball stud.
INSTALLATION (Refer to Figs. 1, 2, and 5)
NOTE: Check all parts for wear, cracks,
distortion, or other damage. Replace all com­
ponents that would affect proper operation of the