GMC 4000 Series Service Manual page 493

Sec. 9A
Page 482
MECHANICAL STEERING
Figure 17— Steering Colum n and Shaft (Tilt Models)
gear worm shaft (21) and install bolt and nut; tighten
clamp bolt nut to 30-40 foot-pounds torque.
3. Raise steering column to position and in­
stall parking brake spacers, brackets, and bolts
and nuts if previously removed. To prevent axial
bind, tighten nuts firm ly at dash bracket before
installing remaining clamps. Install upper and
lower steering column clamps (14) and torque bolt
nuts to 8-12 foot-pounds.
4. Slide steering column floor seal down col­
umn to floor board, and pry lip of seal into opening
G M C S E R V I C E M A N U A L
of floor until it is properly seated.
at under-side of steering wheel hub (10), with horn
contact extension inserted in hub. Install steering
wheel and cam over shaft end (2), with lower spoke
aligned at the 6 ofclock position. Line up cut-out
portion of receiver cup with mark on center of shaft
end as shown in figure 15. Install washer and nut
(11), and torque to 35-45 foot-pounds. P ress horn
button (13) and retainer ring (12) into place over
Upper Steering
receiver cup.
Shaft
Steering Wheel
before adjusting steering shaft to steering column
Lock Nut
stop clamp, or axial clearance. If steering wheel is
Steering Wheel
not properly positioned and torqued, before adjust­
Directional
ing stop clamp, it will be necessary to readjust
Housing
clamp after installing wheel.
Upper Mast
Jacket
shaft to allow 0.12" minimum to 0.13" maximum
Steering
axial movement of shaft. Torque clamp bolt nut to
Column
8-12 foot-pounds.
Column Clamp
Lower Bearing
connectors (22) to multiple connector under dash.
9 Steering Shaft
10 Inner Seal
11 Spring Seat
12 Spring
13 Outer Seal
14 Stop Clamp
15 Center
Universal Joint
16 Slip Joint
DESCRIPTION
17 Dust Cap
18 Lower Shaft
is two-piece type, connected by universal joints.
19 Floor Seal
A slip yoke sleeve arrangement is provided on
20 Floor Seal
lower shaft to facilitate the tilting of cab. D irec­
Retainer
tional switch is housed in upper steering column,
21 Lower
while hazard warning switch is mounted to dash.
Universal Joint
22 Yoke Clamp
REMOVAL
23 Worm Shaft
24 Steering Gear
viously in this section under "Steering Wheel Re­
25 Column Clamp
placement."
T-5688
under dash.
worm shaft (23) so they can be installed in same
position, loosen, or remove clamp bolt and nut at
worm shaft.
if used, from steering column.
tainer (20) from cab floor.
clamps (7) to supports and braces. Remove steer­
ing column and shaft assem bly.
DISASSEMBLY
column (6).
5. Place cam and horn contact assembly (8)
NOTE: Steering wheel must be installed first
6. Adjust stop clamp (17) on upper steering
7. Connect directional and hazard warning
STEERING COLUMN A N D SHAFT
ASSEMBLY (TILT CAB MODELS)
(Key Numbers Refer to Figure 17
Unless Otherwise Indicated)
Steering column assembly of tilt cab models
1. Remove steering wheel as described pre­
2. Disconnect all wiring from steering column
3. Mark clamp yoke (22) and steering gear
4. Remove trailer hand brake control valve
5. Remove steering column seal (19) and re­
6. Remove all bolts attaching steering column
1. Pull upper steering shaft (1) from steering