GMC 4000 Series Service Manual page 60

SPACER
STRIKER BOLT
A N D W ASH ER
Figure 8 — Door Striker Bolt and W ashers
3. Lift upward or pull downward at rear of
door to tilt upper portion of door "fore" or "aft"
as desired.
4. Tighten hinge cap screws firmly after mak­
ing adjustment. Open and close door to check oper­
ation. Repeat adjustment if necessary. Install cap
screw access plug in door inner paneling.
5. Install striker bolt and adjust as directed
later under "Striker Bolt Adjustment."
REPOSITION DOOR "IN" OR "OUT" (Fig. 7)
Horizontal cap screw slots exist in cab half of
hinge assembly to permit this adjustment.
The outer surface of door, when properly in­
stalled, should be flush with adjacent surfaces of
cab. If necessary, reposition door as follows:
1. Loosen slightly all cap screws which attach
hinge half to cab pillar.
2. If door is to be brought outward from cab
opening, apply pressure at door hinge area from
inside cab. If door is to be moved inward, apply
pressure on door outer panel at hinge area. Be
careful not to damage door paneling by applying
excessive pressure.
3. After adjustment has been made, tighten
hinge cap screws firmly. Open and close door to
check operation. Readjust if necessary.
NOTE: It may be necessary to reposition
striker on pillar after making above adjustment.
See "Striker Bolt Adjustment."
DOOR STRIKER
The door striker consists of a special bolt
and washer assembly which is threaded into a
tapped, floating cage plate located behind the cab
lock pillar as shown in figure 8. The door is s e ­
cured in closed position when the lock cam in door
engages and snaps-over the striker bolt. Striker
bolt can be replaced or adjusted as directed under
applicable headings.
STRIKER BOLT REPLACEMENT (Fig. 8)
1. Mark position of striker bolt spacer or
washer on door pillar using pencil or crayon.
G M C S E R V I C E M A N U A L
PLASTIC W ASH ER
J
TAPPED FLOATING
PLATE
Figure 9 — Sight Checking Striker Bolt Alignment
2. Insert a 5/16-inch hex wrench into head of
striker bolt, then turn bolt counterclockwise from
plate in cab pillar.
3. Reverse above procedure to install striker
bolt. Make sure the thin plastic washer is position­
ed against the painted door opening pillar and cen­
ter the bolt washer within marks on pillar.
4. If door has been removed and then installed
or aligned in opening, the door should not be closed
completely until a visual check is made to deter­
mine if lock cam in door will engage the striker
bolt correctly. Center of striker bolt should be in
direct alignment with "V" slot in door. See figure
9. If necessary, reposition striker bolt as directed
below under "Striker Bolt Adjustment."
STRIKER BOLT ADJUSTMENT (Fig. 10)
Striker bolt on cab pillar is adjustable vert­
ically and transversely after loosening the bolt
with a 5/16-inch hex wrench. The bolt fore and aft
adjustment is obtained by use of shim spacers lo ­
cated between the bolt washer and the cab pillar.
Figure 8 illustrates location of bolt, washers, and
spacer.
Striker Bolt Fore and Aft Adjustment
1. To check striker bolt for proper fore and
aft adjustment, smear grease or paint to contact
side of bolt as shown in figure 10.
2. Slowly close door until lock cam of door
just contacts the side of striker bolt and makes an
impression in the grease or paint.
3. Measure distance between head of bolt and
the cam impression in grease. Distance should
measure 1/8-inch as shown in right view of figure
10. This dimension is necessary to assure that the
head of striker bolt will ride at center of nylon
shoe which is located just in back of the lock cam.
To obtain this dimension, remove the striker
bolt and install or remove shim spacers. Spacers
Sec. 1
Page 53
TILT CAB