Chevrolet 10 Series 1968, Service Manual

Page: 157 / 713

FRONT SUSPENSION 3-18
STEEL
WASHER
CHEVY VAN
5,000# - 7 , 0 0 0 #
____ SHIELD
BRONZE
ASHER
DUST SHIELD
4 ,0 0 0 #
9 ,0 0 0 # -1 1 ,0 0 0 #
THRUST
WASHER
STEEL
WASHER
Fig . 4 1 —Thrust Bearing D efail
2. Remove bolts retaining brake backing plate to steer­
ing knuckle and withdraw plate. Attach backing plate
to frame or body to prevent damage to brake hoses.
3. Swing steering and tie rod arm out of work area.
NOTE:
Refer to Section 9, Steering, for further
steering arm service operations.
4 0 -6 0 Series
(Except H e a v y Duty 9 0 0 0 # — I 1 , 0 0 0 # )
4. a. Remove upper and lower dust caps.
b. Remove kingpin lockpin nut and pull out lockpin.
c. Tap kingpin out from bottom and withdraw steer­
ing knuckle, shim, and thrust bearing pack.
9 0 0 0 # - 1 1 , 0 0 0 #
a. Remove upper dust cap and lower expansion plug
lock ring.
b. Remove kingpin upper cotter pin and nut. On
11,000 lb. axle remove metal spacer under king­
pin nut.
c. Drive kingpin downward out of axle and knuckle.
Withdraw steering knuckle, thrust bearing and
spacer washers.
d. Remove upper kingpin bushing. This bushing is a
.001” -.003" fit and may be pushed out by hand.
Inspection
1. Wash all parts in solvent and air dry.
2. Inspect steering knuckle for distortion, cracks or
breaks. If equipment is available, use magnetic
penetrant method to check for minute fractures.
3. Examine thrust bearings or washers for excessive
wear or scoring.
4. Examine steering knuckle bushings and kingpin for
excessive wear or scoring.
Repairs
K ingpin
If kingpin is damaged, it must be replaced during reas­
sembly of steering knuckle.
Bushings
Steering knuckle bushings are splite type floating
glass filled polycarbonate bushing on all axles except the
9000# and 11,000# axles which use Delrin. A ll bushings
can be removed by sliding bushing out knuckle bores
without the use of special tools. After removal, clean up
bushing bores using medium grit abrasive cloth. Wipe
bores clean, lubricate bushing O.D. and install into
knuckle.
Also lubricate and place new “ O” ring seal in upper
knuckle bore under the upper bushing on all models ex­
cept Chevy Van 20 Series— seal is located on the axle
(fig. 40).
Installation
1. a. On 4000# Models
Position steering knuckle on axle end and slide
thrust washer assembly, consisting of one center
steel washer and two bi-metallic upper and lower
washers encased in dust shields, between lower
face of axle end and steering knuckle lower yoke.
CHEVROLET TRUCK SERVICE MANUAL