GMC 4000 Series Service Manual page 491

S 9A
g c
Page 480_______________________
MECHANICAL STEERING
1 D irection al Housing
2 Upper Steering Shaft
3 Switch Support
4 Upper Bearing
5 Snap Ring
6 Directional and Hazard
Warning Switch
7 Screw
8 Cam Assembly
be under spring tension and be free from binding
condition. Place canceling cam over brush, and
align holes in cam with two tapped holes in hub.
Secure cam to hub with two screw s and tighten
securely.
INSTALLATION
1. Position steering shaft and coupling, or
upper and lower column assembly of two section
units in vehicle. Place yoke clamp (19), or coupling
clamp, on steering gear worn shaft (20), with match
marks aligned.
2. Raise column into position and loosely in­
stall all brackets, and bolts or clamps (4) as they
were previous to removal. Position floor seal (2)
in place at cowl or floor.
IMPORTANT: To prevent axial bind, all steer­
ing column attaching brackets, or supports should
be tightened first where they fasten to cab. Tighten
steering shaft coupling, or yoke clamp at steering
gear worm shaft, before tightening clamps which
actually secure the column to mounting brackets.
3. Install screw s which attach steering col­
umn floor seal and retainer to floor or cowl.
4. Tighten all the steering column attaching
clamps, bolts, and nuts in the sequence just des­
G M C S E R V I C E M A N U A L
9 Steering Wheel
10 Steering Wheel Hub
11 Steering Wheel Lock Nut
12 Retainer
13 Horn Button
14 Lower Steering Column
Clamp
15 Lower Bearing
Figure 16— Steering Colum n and Shaft IP Models)
cribed. Tighten all clamps to the torque listed in
''Specifications" at end of this section.
using care to align mark on shaft end, with center
of cut-out portion of horn receiver cup as shown
in figure 15. Tap wheel on shaft and install washer
and lock nut (8). Torque nut to 45-50 foot-pounds.
P ress horn button into place in wheel hub.
inner seal (12), spring seat (13), spring (14), outer
column seal (15), and stop clamp bolt and nut (16)
against lower column bearing (11). Install with inner
seal inserted in lower bearing recess. Adjust stop
clamp so that 0.12" minimum to 0.15" maximum
axial shaft end play movement exists. This clear­
ance must be maintained to prevent binding of
bearings or steering wheel chucking condition.
ing wiring connector to multiple connection under
dash.
umn if previously removed.
looseness, or chucking, and make adjustments,
if necessary. Check turn lights, hazard warning,
and horn operation. Inspect all components for
loose bolts and tighten if necessary.
16
Spring
17 Stop Clamp
18 Center Universal Joint Assy.
19 Slip Yoke
20 Lower Shaft Clamp
21 Worm Shaft
22 Multiple Connector
23 Upper Harness Cover
5. Install steering wheel to steering shaft (7)
6. At lower end of steering column position
7. Connect directional signal and hazard warn­
8. Secure trailer hand brake control to col­
9. Test action of steering wheel for bind,
T-5797