GMC 4000 Series Service Manual page 489

Sec. 9A
Page 478
MECHANICAL STEERING
1 Tube Yoke Bushings
2 Snap Rings
3 Cork Washers
4 Tube Yoke Center Cross
5 Washer
6 Yoke, Tube, & Sleeve Assy.
7 Felt Washer
8 Dust Cap
9 Yoke Shaft
replaced. Inspect all wiring, connections, and di­
rectional control switch assembly for bare spots,
loose connections, or general deterioration. Di­
rectional switch is serviced as an assem bly, com­
plete with wiring harness. Switch should operate
smoothly and be free from binding condition. Check
horn contact brush surface, and inspect contact
plunger for freedom of action and binding condition.
Upper column bearing horn contact surface should
not be worn excessively or have deep grooves cut
it it.
Clean all universal joint parts in a suitable
solvent. Inspect bearing bushings for galling, which
is evidenced by pitting or deep ridges in bores.
Inspect journal bearing surfaces for galled spots.
Check amount of journal and bushing clearance, if
it is excessive, replace joint or correct steering
adjustment will be difficult to obtain. If any of the
above conditions exist, parts should be replaced.
Journal and bushing assembly should be replaced
as a complete unit only. If only badly worn parts of
a unit are replaced, premature replacement of re­
maining parts will be necessary later.
All mounting brackets and components should
be checked for cracks and breaks, repair or secure
new parts as necessary. All dust shields of rubber
or sim ilar construction should be replaced with
new, if slightest evidence of damage is present.
Install all new sea ls when assembling steering
system .
G M C S E R V I C E M A N U A L
Figure 13— Intermediate Shaft (Typical)
ASSEMBLY
where noted.
ing column tube (5). Install directional signal hous­
ing (6) at upper end of column by turning unit
clockwise to lock it in place in upper jacket.
through opening in base of upper column jacket be­
fore locking switch and directional housing, to col­
umn with the three attaching screw s. See "Multiple
Wire Connectors" of this section for connector
installation.
and hazard warning control switch and harness (2
and 3) in housing (8) using the three retainer screws
(7). Tighten screws securely. Install hazard warn­
ing switch (5) to housing. Inspect wiring harness
(3) and make certain it is not pinched and is prop­
erly positioned. Install directional control lever (1)
to bracket on control switch. On columns using
clips, secure harness to clips.
umn, assem ble center universal joint (17), bush­
ings, and seals to yokes, and journal using new
repair kit. Lubricate joint when assembled.
assem ble joint as described in Step 3 above.
cap (8), washer (5), and felt seal (7) on lower
10 Cork Washers
11 Yoke Shaft Bushings
12 Snap R ings
13 Lube Fitting
14 Yoke Shaft Center Cross
15 Clamp Yoke
Key numbers in text refer to figure 14, except
1. P ress bearing (11) into lower end of steer­
NOTE: It is necessary to insert wiring harness
2. Referring to figure 12, install directional
3. On vehicles using two-piece steering col­
4. If lower universal joint was disassembled,
5. Referring to figure 13, install tabbed dust
- 5 7 6
t i