GMC 4000 Series Service Manual page 57

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TILT CAB
Figure 2 — Releasing Cab H old -D ow n M echanism
outer and inner cab paneling and is dispersed to
heater and vent outlet.
Cab is three-point mounted to chassis. Weight
of cab at front is supported on cab right and left
tilt hinges and a support bracket having rubber
cushions, supports cab at rear center. Cab tilt hold-
down mechanism locks cab firmly on cushions.
The underside of cab is completely insulated
to deaden sound and prevent corrosion. A rubber
weatherstrip around perimeter of door is used for
sealing door to cab opening.
CAB TILTING INSTRUCTIONS
TO RAISE CAB (Fig. 2)
IMPORTANT: Before tilting cab forward, re­
move loose articles in cab; also place transm is­
sion shift lever in neutral and apply hand brake.
1. Close both doors of cab.
Sill Brackets
Cab Right
0 Frame Bracket
Check Link and
Release Rod
CAB FRONT MOUNTING
G M C S E R V I C E M A N U A L
hook.
the right, pull hold-down release lever out and up­
ward until hold-down catch becomes disengaged
and rear of cab raises from mount (fig. 2). Tilt
the cab completely forward until check link at right
front mounting locks cab safely in full-tiltposition.
ly engaged with frame anchor pin.
TO LOWER CAB (Fig. 2)
ating position, make sure transmission shift lever
is in neutral position and that hand brake lever is
in the applied position.
(see inset, fig. 2) by pulling rearward on link re­
lease rod, then pull cab back to operating position.
ally become engaged. Pull downward on hold-down
release lever and engage lower end of lever in
lever spring catch, bracket-mounted to rear of cab.
in clip bracket and lug on lever by inserting the
chain hook from underside.
can be adjusted as desired by means of relocating
torsion bar anchor lever at left frame bracket. If
required, make adjustment as directed later under
"Torsion Bar Tension Adjustment."
mountings at front and twin cushion-type mountings
at rear. Refer to figure 3 for typical views of
mountings.
Cab Rear Support
Cab Rear Mounting
Cab Left
Frame Bracket
Figure 3 — C ab M o u n tin g s
2. At right rear of cab remove safety chain
3. While holding safety catch release rod to
IMPORTANT: Make sure check link is proper­
IMPORTANT: Before lowering the cab to oper­
1. Release check link at right front mounting
2. Safety catch at rear of cab will automatic­
3. Engage safety hook through matching holes
NOTE: The raising and lowering effort of cab
CAB MOUNTINGS
Cab is three-point mounted with two pivot-type
Lubrication Fitting
y
Cab Hold-Down Catch
Return Spring
Cushions
CAB REAR MOUNTING
Hold-Down Catch
Release Rod 1
Safety Catch
Safety Catch
Release Rod
Release Rod Lever
Check Link
Release Rod