GMC 4000 Series Service Manual page 59

Sec. 1
Page 52
TILT CAB
DOORS
Component sub-assem blies of cab doors, such
as window regulator, door lock, remote control,
vent window, and door window can be replaced
without necessity of removing door from cab. Doors
can be removed, however, without prior removal of
above components. Removal and installation of
door window glass is described later in this section.
DOOR REPLACEMENT
REMOVAL
1. With the aid of an assistant to support
weight of door, remove the screws which attach
hinge straps to door. A ccess to one cap screw at
door upper hinge is gained by removing plug from
door inner panel.
2. Carefully remove door assembly from cab.
INSTALLATION
Attach door to hinge straps with six cap screw s.
Adjust door in cab opening as instructed later under
"Door Adjustments."
DOOR ADJUSTMENTS
Doors can be adjusted for alignment or clear­
ance in the cab door opening (fig. 6), and for proper
latching. Door alignment adjustments are made at
the striker bolt, and at door hinges. The door, when
properly located in door opening, will have equal
clearance around its perimeter.
G M C S E R V I C E M A N U A L
be made in sequence described in the following
paragraphs:
REPOSITION DOOR "UP" OR "DOWN" (Fig. 7)
ing is provided by means of floating hinge cap
screw tapping plates within door framing. Hori­
zontal slotted cap screw holes in cab half of hinge
assembly provide the "in" or "out" adjustment of
door.
Reposition door on hinges to provide equal clear­
ance around perimeter of door in cab opening.
hinge is gained after removing plug from door
inner panel.
tained, tighten hinge cap screw s firmly. Open and
close door to check operation. If necessary, repeat
adjustment. Install hinge cap screw access plug in
door inner paneling after making final adjustment.
later under "Striker Bolt Adjustment."
REPOSITION DOOR "FORE" OR "AFT" (Fig. 7)
"fore" or "aft." This adjustment is made at the
upper hinge. No means for this adjustment exists
at the lower hinge.
slightly. A ccess to one cap screw at door upper
hinge is gained after removing plug from door inner
panel.
Figure 7 — Door Hinges
If door has been replaced, adjustments should
Door "up" and "down" adjustment in cab open­
1. Remove striker bolt from cab pillar.
2. Loosen hinge-to-door cap screw s slightly.
NOTE: A ccess to one cap screw at door upper
3. After satisfactory adjustment has been ob­
4. Install striker bolt and adjust as directed
Only the upper portion of door can be adjusted
1. Remove striker bolt from cab pillar.
2. Loosen upper hinge-to-door cap screws