Chevrolet 10 Series 1970 Service Manual page 160

FRONT SUSPENSION 3-12
F ig . 2 5 — P o sitio n in g U pper C o n tro l Arm S haft
Repairs
Bushings
1. R em ove grea se fittin gs fro m ends of bushings and
unscrew bushings fro m shaft and control arm .
m ove shaft and sea ls.
2. Slide new seal on each end of shaft and in sert shaft
into control arm .
3. Start new bushings on shaft and into control arm .
Adjust shaft until it is centered in control arm , then
turn bushings in and torque
190 lb. ft. fo r CP20-30 i f spacer is used, 95 lb. ft.
fo r CP10, 135 lb. ft. fo r CP20-30 if no spacer is
used. Check shaft fo r fr e e rotation. F igu re 25 shows
c o rre c t final positioning o f shaft.
Ball Joint
1. Center punch r iv e t heads and d r ill out riv e ts . R ivets
may also be ch iseled o r ground off.
2. R em ove b all joint assem bly and inspect arm fo r
cracks or d istortion at the ball joint seat.
3. Install s e rv ic e b all join t assem bly in arm using
special hardened bolts only, torquing bolts 45 lb. ft.
Installation
NOTE: A ll spring attachments, including center
bolts, are im portant attaching parts in that they
could a ffect the p erform a n ce of vita l components
and system s, and/or could resu lt in m ajor r e ­
p a ir expense. They must be replaced with parts
o f the same p art numbers o r with equivalent
parts if replacem ent becom es necessary. Do not
use replacem ent p arts o f le s s e r quality o r sub­
stitute design. Torque values must be used as
sp ecified during rea ssem b ly to assure p rop er
retention of these parts.
1. P la c e control arm in position on bracket and install
nuts. B efore tightening nuts, in sert ca ster and cam ­
b e r shims in the sam e o rd e r as when rem oved.
R e ­
160 lb. ft. fo r CP10,
Tighten nuts 80 lb. ft. fo r CP10 m odels, 155 lb. ft.
fo r CP20-30 m odels.
2. In sert ball joint stud into steerin g knuckle and install
nut. Tighten stud nut 70 lb. ft. on CP10 m odels,
120 lb. ft. on CP20-30 m odels.
3. Rem ove spring co m p resso r J-6874 i f used, and r e ­
m ove adjustable support fro m under con trol arm .
Install wheel and tire assem bly.
4. L o w e r veh icle and check front end alignm ent and
adjust where n ecessary.
5. L o w er veh icle on hoist.
Steering K nuckle/Steering Arm
NOTE: It is recom m ended
raised and supported on a tw in-post hoist so that
the front c o il spring rem ains com pressed, yet
the wheel and steerin g knuckle assem bly rem ain
accessib le. If a fram e hoist is used, support
low er con trol arm with an adjustable jackstand
to safely retain spring
position
Removal
1. R aise veh icle on hoist and support lo w er control arm
as noted above.
2. Rem ove hub cap, wheel hub dust co ver, cotter pin ad­
justing nut and washer, withdraw wheel and tire,
brake drum, and wheel hub and bearing assem bly
fro m steerin g knuckle spindle.
3. Disengage brake shoe return springs and rem ove
brake shoe hold-down clip s.
from backing plate.
CAUTIO N: Keep brake
4. R em ove brake anchor pin and two bolts securing
brake backing plate and steerin g arm
knuckle.
5. W ithdraw steerin g arm and brake backing plate from
steerin g knuckle. W ire backing plate to fram e. Do
not disconnect brake line.
NOTE: R e fe r to Section 9-Steering, fo r further
steerin g arm s e rv ic e operations.
6. R em ove upper and lo w e r ball stud co tter pins and
rem ove b all stud nuts. F r e e steerin g knuckle from
ball studs by rapping steerin g knuckle bosses. W ith­
draw steering knuckle.
Installation
1. P la ce steerin g knuckle in position and in sert upper
and low er ball studs into knuckle bosses.
2. Install ball stud nuts and tighten as follow s: Upper
nuts 70 lb. ft. CP10, 120 lb. ft. C P20-30; low er nuts
120 lb. ft. CP10, 215 lb. ft. CP20-30.
NOTE: These b all stud nuts to knuckle fa s ­
teners are im portant attaching parts in that they
could a ffect the p erform an ce o f v ita l components
and system s, and/or could resu lt in m ajor r e ­
p a ir expense. They must each be replaced with
one of the same part number o r with an equiva­
lent part i f replacem ent becom es n ecessary. Do
not use a replacem ent part of le s s e r quality or
substitute design. Torque values must be used
as specified during reassem bly to assure p rop er
retention of this part.
that veh icle be
in its curb height
Rem ove brake shoes
shoes clean and dry.
to steerin g
CHEVROLET TRUCK SERVICE MANUAL