GMC 4000 Series Service Manual page 39

Sec. 1
Page 32
CONVENTIONAL CAB
Figure 2 — Cab Front M ounting
SEATS
SEAT ADJUSTMENT
If right- and left-hand seat adjusters do not
release simultaneously, lengthen or shorten ad­
juster lock rod underneath the seat assembly.
A stud adjustment nut and wing nut at ends of
seat-back frame (fig. 4) provide a means of chang­
ing tilt of seat-back. To change tilt of seat-back,
loosen each wing nut and turn adjustment nuts
o
CROSSM EM BER
CROSSM EM BER
BRACE
Figure 3 — C a b Rear M o u n tin g
G M C S E R V I C E M A N U A L
above seat-back fram? brackets an equal amount
to raise or lower seat-back. Tighten wing nuts to
secure desired position.
SEAT TRACK REPLACEMENT
readily replaced after seat assembly is removed
from cab.
track assembly to seat cushion. Lift seat assembly
from cab.
ed, disconnect lock rod between tracks, then re­
move four bolts which attach each track to cab
floor panel. Remove track assembly.
FLAT W ASHER
track assembly.
UPPER C U SH IO N
ASSEMBLY
as window regulator, door lock, remote control,
and vent window can be replaced without necessity
of removing door from cab. Doors can be replaced
LOWER CU SH IO N without prior removal of above components.
ASSEMBLY
in this section.
as follows:
REMOVAL (Fig. 5)
NUT (TORQUE
from door check strap at cab bracket.
20-25 FT. LBS.)
T-5707
of door, remove three cap screws which attach
each hinge strap to door. Remove door and hinge
shims (if used).
SE A T B A C K
A D JU S T IN G STUD
A N D N U TS
FO RE A N D AFT
A D JU S T IN G LEVER
Figure 4 — Full Width Seat Back Adjustment
NOTE: The seat track assem blies are more
1. Remove four screws which attach each
2. If only one track assembly is to be remov­
3. Reverse the above procedure to install
DOORS
Component sub-assem blies of cab doors, such
Replacement of door glass is explained later
Instructions for replacing door assembly are
1. Using small punch, drive spring pin up
2. With aid of an assistant to support weight