GMC 4000 Series Service Manual page 494

2. Referring to figure 12, remove directional
control lever from control switch.
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.
3. Remove three screws (7) which retain di­
rectional signal switch to signal housing. Remove
directional switch and harness.
4. Remove directional switch housing (4) from
column (5) by turning counterclockwise to unlock
from tabs.
5. Pull, or pry lower bearing (8) from steer­
ing column, if damaged or defective.
6. Remove inner seal (10), spring seat (11),
spring (12), outer seal assembly (13) and stop
clamp (14) from upper steering shaft.
7. Refer to figure 13 to separate upper and
lower steering shafts at joint (15) (fig. 17).Remove
two snap rings (2), and tap yoke sideways to dis­
lodge bushings (1) of adjoining yoke; repeat oper­
ation until all bushings are removed. Remove cork
sea ls (3) from journal (4) and discard.
8. To remove slip yoke (16) from lower shaft
assem bly (18), bend tabs of dust shield (17) away
from retainer groove. Pull shaft, felt seal, and
washer from yoke sleeve. Slide components from
shaft, and discard seal.
9. If disassembly of lower clamp yoke to shaft
is desired, proceed as described in Step 7 above.
INSPECTION
Inspect steering column components and re­
place, or repair, as described previously in "In­
spection" of this section.
ASSEMBLY
Refer to figure 17 unless otherwise indicated.
1. P ress bearing (8) into lower end of upper
steering column tube (6).
2. Install directional signal housing (4) at
upper end of column by turning it clockwise to lock
it in place in upper jacket.
NOTE: It is necessary to insert wiring harness
through opening in base of upper column jacket
before locking switch and harness to column with
the three attaching screw s. See "Multiple Wiring
Connectors" of this section for connector install­
ation.
3. Referring to figure 12, install directional
control switch in housing using the three retainer
screw s. Tighten screws securely. Inspect wiring
harness and make certain it is properly positioned
and not pinched. Secure harness to column with at­
tached clips. Fasten directional control switch
lever to switch using single screw.
4. At lower steering shaft (18), position floor
seal (19), tabbed dust cap (17), metal washer, and
new felt seal on splined yoke shaft (18). Lubricate
G M C S E R V I C E M A N U A L
splines lightly. Align arrows on yoke shaft, and
slip joint tube. Slide shaft into tube and crimp
tabs of dust cap into groove in yoke tube.
clamp (15) was previously disassembled, assemble
installing new cork seals (10) to cross journal (14),
install new bushings (11) and snap rin g(12).P ress,
or tap bushings in yoke over cross journals until
snap rings can be installed in bushings.
(4), and lower shaft (6) upper yoke in upper shaft
yoke. Install all new cork washers (3), on journals
(4), install new bushings (1) and snap rings (2).
P ress or tap bushings in yoke over cross journals
until snap rings can be installed in bushings.
(12), spring seat (11) and inner seal (10) on upper
shaft. Insert upper shaft into lower steering column
bearing (8), and push upward through upper bearing
until shaft extends past top of mast jacket.
INSTALLATION
Align match marks and place lower yoke clamp (22)
on steering gear worm shaft (23). Tighten clamp
bolt nuts to 40-50 foot-pounds torque.
stall all brackets, and bolts or clamps (7) as they
were previous to removal. Position floor seal (19)
in place at floor.
ing column attaching brackets, or supports should
be tightened first where they fasten to cab. Tighten
steering shaft yoke clamp at steering gear worm
shaft before tightening clamps which actually s e ­
cure the column to mounting brackets.
umn floor seal, and retainer to floor.
clamps, bolts and nuts, in sequence described
above. Tighten all column clamps to torque listed
in "Specifications" at end of this section.
using care to align mark (5) on shaft end with cut­
out portion (1) of horn receiver cup (4) as shown
in figure 15. Tap wheel on shaft and install washer
and lock nut. Torque nut to 45-50 foot-pounds.
P ress horn button into place in wheel hub.
inner seal (10), spring seat (11), spring (12), outer
column seal (13), and stop clamp (14), bolt and nut,
against lower column bearing (8).
bearing recess. Adjust stop clamp so that 0.005"
minimum to 0.030" maximum axial shaft end play
movement exists. This clearance must be main­
tained to prevent binding of bearings, or steering
wheel chucking condition.
MECHANICAL STEERING
5. Refer to figure 13, if lower shaft yoke
6. Refer to figure 13, position center cross
7. Slide stop clamp (14), outer s e a l(13), spring
1. Position steering shaft assembly in vehicle.
2. Raise column to position, and loosely in­
IMPORTANT: To prevent axial bind, all ste er­
3. Install screw s which attach steering col­
4. Tighten all the steering column attaching
5. Install steering wheel to steering shaft,
6. At lower end of steering column, position
7. Install with inner seal (10) inserted in
8. Connect directional signal wiring connector
Sec. 9A
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