GMC 4000 Series Service Manual page 40

Figure 5 — C a b Door Hinges and Check Link
INSTALLATION (Fig. 5)
1. Position door to hinge straps and install
attaching cap screws loosely. Insert shims (if
used) between hinge and door. Note direction of
slots in upper and lower hinge shims as illustra­
ted in figure 5.
2. Adjust door-to-cab opening as explained
later under "Door Adjustments."
3. Connect door check strap to cab pillar
bracket by driving spring pin down from the top.
NOTE: It is not recommended that the access
panel be removed from door inner panel for pur­
pose of storing heavy tools in door compartment.
DOOR ADJUSTMENTS
Doors can be adjusted for alignment or clear­
ance in the cab door opening (fig. 6), and for proper
latching. The door, when properly located in door
opening, will have equal clearance around its
perim eter.
Door alignment adjustments are made at the
striker bolt and door hinges. Rubber seal around
door should be lubricated with silicone lubricant
and door vent window should be open before open­
ing and closing door while making door adjustment.
Before adjusting hinges, remove the striker bolt
from the cab pillar.
DOOR "FORE" AND "AFT" POSITIONING
The fore and aft adjustment of door is pro­
vided by the removal or installation of shims in­
serted between door and hinge strap (fig. 5). At
only one hinge at a time, loosen three cap screws
G M C S E R V I C E M A N U A L
which attach hinge strap to door. Add shim to in­
crease clearance at door leading edge or remove
shim (if used) to decrease clearance. Repeat ad­
justment at other hinge, as required.
front and rear (fig. 6). After making adjustment,
tighten hinge screws firm ly.
DOOR "IN" OR "OUT" POSITIONING
half of hinge provide the "in" and "out" adjustment
of door (fig. 5). Loosen three cap screws which
attach each hinge strap to door. Reposition door
on hinge straps so that door outer surface is flush
with cowl surface.
as directed later under "Door Striker."
and washer assembly which is threaded into a
tapped, floating cage plate located behind the cab
lock pillar as shown in figure 7. 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
Removal (Fig. 7)
CONVENTIONAL CAB
Figure 6 — Door Clearances
Door should have equal clearances at both
Horizontal slotted cap screw holes in door
Perform clearance adjustment at rear of door
DOOR STRIKER PLATE
The door striker consists of a special bolt
1. Mark position of striker bolt spacer or
Sec. 1
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