GMC 4000 Series Service Manual page 62

Figure 13— Door Handle Components
2. Roll door glass to top, then through access
opening, using a 7/16" wrench, remove two bolts
which attach door handle to door outer panel. Re­
move handle and handle gaskets (fig. 11).
NOTE: Reinforcement plate is spot-welded to
inside of door outer panel.
3. Remove the button shaft retainer by first
depressing, then rotating retainer as shown in
figure 12. Remove shaft spring and button assem ­
bly with O-ring seal from handle (fig. 13).
INSTALLATION
1. Place button assembly with installed O-ring
seal in handle.
2. Locate spring over button shaft, then in­
stall spring retainer (fig. 12).
3. Position door handle with gaskets to door
outer panel, then through access opening at bottom
of door, install two attaching bolts.
4. Install access panel to bottom of door.
DOOR LOCK CYLINDER
REPLACEMENT
REMOVAL (Fig. 14)
1. Remove access panel at bottom of door.
2. Through access panel opening, pull lock
cylinder retainer from beneath the lock cylinder
grooves by grasping retainer lip with pliers.
3. Tilt lock assembly to permit cylinder lug to
disengage from lock mechanism lever. Remove
lock cylinder and gasket from door.
INSTALLATION (Fig. 14)
1. With gasket in position on lock cylinder,
insert cylinder in door and engage lug over lock
mechanism lever.
2. While holding cylinder, insert legs of re-
G M C S E R V I C E M A N U A L
tainer into grooves of lock cylinder body. Be cer­
tain legs of retainer are fully engaged. It may be
necessary to drive retainer into final engagement
with a light hammer.
lock operates freely, install lower access panel
to door.
handle are retained on shafts by lock springs. If
Figure 14— Door Lock Cylinder Replacement
3. Insert key and check operation of lock. If
DOOR INSIDE HANDLE
REPLACEMENT
Window regulator crank handle and door lock
Figure 15— D ise n g a g in g Door Insid e H an d le
Sec. 1
Page 55
TILT CAB