GMC 4000 Series Service Manual page 488

4. Install retainer and horn button cap and
connect directional signal wiring harness to chassis
wiring harness connector.
STEERING COLUMN A N D SHAFT
(CAB A N D COWL MODELS)
REMOVAL (Refer to Fig. 14)
NOTE: A one-piece steering shaft is used on
all cab models and a two-piece shaft is used on all
cowl models.
1. Disconnect directional signal and em er­
gency disability lighting connector from multiple
connector under dash.
2.
R em ove ste e r in g w h eel a s d esc rib ed under
"Steering Wheel Replacement" previously.
3. Mark clamp yoke (19) or coupling and
steering gear worm shaft (20) to insure installation
in the same relative position (figs. 6 and 11).
4. Remove bolt attaching clamp yoke or coup­
ling on steering shaft to steering gear worm shaft.
5. If used, remove cap screws which attach
trailer brake hand control valve to steering col­
umn and remove attaching clamp.
6. Remove screws which attach steering col­
umn seal retainer and seal (2) to cab floor.
7. Remove bolts which attach steering column
(5) to supports and braces, then pull housing off
steering shaft and remove from vehicle.
NOTE: On vehicles equipped with the one-
piece steering shaft, the dash support brace (4)
must be removed to gain sufficient clearance to
remove steering shaft and coupling.
8. Lift clamp yoke or coupling off steering
gear worm shaft, then twist and turn shaft assem ­
bly as required to remove from vehicle.
DISASSEMBLY
1. Remove screws attaching directional signal
control lever to control switch assembly and re­
move lever (1, fig. 12).
NOTE: It is necessary to remove multiple wire
connector at end of harness before directional
switch can be removed. See ''Multiple Wire Con­
nectors" as described previously in this section.
2. Remove three screw s (7, fig. 12) which at­
tach directional signal control switch assembly (2)
to control housing (8). Remove switch and harness
(3) from housing.
3. Twist directional control housing(8 ,fig. 12)
counterclockwise and remove from steering column
4. Pull steering shaft (7) from steering column
(5), and pry lower bearing (11) from tube, if bear­
ing is worn or defective.
5. Remove bearing inner seal (12), spring seat
(13), spring (14) and outer seal assembly (15). Re­
move stop clamp (16) and bolt, if desired.
G M C S E R V I C E M A N U A L
1 Directional Lever
2 Directional Switch
3 Harness
4 Screw
5 Hazard Warning Switch
6 Upper Bearing
7 Switch Retainer Screw
two-piece shaft, remove snap rings (2) from inside
of universal joint. Tap yoke sideways to dislodge
bushing (1) of adjoining yoke, repeat operation until
all bushings are removed. Remove cork seals (3)
from journal and discard.
(6) from lower shaft assembly (9), bend tabs of
dust shield (8) away from retainer groove. Pull
shaft (9), felt seal (7), and washer (5) from yoke
sleeve (6).
CLEANING, INSPECTION, AND
REPAIR (ALL MODELS)
spots or loose worn condition, if bearing shows
slightest indication of deterioration it should be
MECHANICAL STEERING
8 Directional Housing
9 Steering Wheel
10 Steering Shaft Lock
11 Upper Steering Shaft
12 Canceling Cam
Figure 12— Upper Steering Colum n (Typical)
6. Referring to figure 13, on vehicles with
7. Referring to figure 13, to remove slip yoke
Inspect steering column bearings for rough
Sec. 9A
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