Chevrolet 10 Series 1970 Service Manual page 153

CASTER ANGLE
C AM BER
C-P 20-30
•4 -3 -2 -1 0 +1 +2
CASTER A N D CAMBER DEGREES
F ig . 6 —C a s te r-C a m b e r C h a rt— 1 0 -3 0 Series
F ig . 7—C a s te r-C a m b e r Shims— 1 0 -3 0 Series
ANGLE B
F ig . 5 —C a ste r-C a m b e r A d ju s tm e n t— 1 0 -3 0 Series
CASTER
C-P 10-20-30
CURB HEIGHT (4.25)
+3 +4 +5
fo r the appropriate veh icle, shown below , find the
recom m ended cam ber angle.
4. If the angle in Step 1 does not correspond to the r e c ­
ommended angle on the chart within ± 1/2°, make
n ecessary changes.
Shims may be changed at eith er front o r r e a r to va ry
c a ster, o r at both points equally to v a ry cam ber (fig . 7).
I Beam A xle M odels
On I Beam axles, i f cam ber angle does not fa ll within
sp ecified lim its , the axle cen ter o r s teerin g knuckle is
bent; if the axle cen ter is bent, r e fe r to Front A x le R e ­
p a ir la ter in this section ; if the steerin g knuckle is dam ­
aged, replace as outlined under Steering Knuckle/Steering
A rm la te r in this section. C aster angle is adjusted by
the use o f tapered shim s placed between the axle spring
seat and spring. To in crea se caster, place thick end o f
shim toward re a r o f v e h icle ; to d e crea se ca ster, place
thick end o f shim toward front o f veh icle (fig . 8).
Toe-In
T o e -in is the amount in fraction s o f an inch that w heels
a re c lo s e r together in fron t than at re a r. Check steerin g
g ea r high point adjustment and place wheels in straight
ahead position b e fo re checking toe-in . Adjustments are
made by loosening clam p bolts at each end o f tie rod,
then turning tie rod tube until wheels have p ro p er toe-in .
Tighten clam p bolts s e cu re ly a fter p ro p er adjustment is
made. A fte r to e -in adjustment on 5000 and 7000 lb.
axles, tie rod sockets should both be tilted in the same
d irection , fo rw a rd o r rea rw a rd , b efo re tightening clamp
bolts (fig . 9).
Cornering W h eel Relationship
C ornerin g wheel relationship, o r toe-ou t on turns is
determ ined by the angle o f the s teerin g arm s. If, when
checking this angle, toe-ou t does not fa ll within specified
lim its , it w ill be n ecessa ry to rep lace d efective steerin g
arm as outlined under Steering Knuckle/Steering A rm
la te r in this section.
Steering Axis or Kingpin Inclination
S teering axis o r kingpin inclination is the tilt o f the
steerin g knuckle kingpin. If the inclination is not within
the sp ecified lim its, the steerin g knuckle is bent and must
be replaced on IFS m odels; on I beam axle m odels, the
axle cen ter is bent and must be rep a ired as outlined
under Fron t A xle R epair la te r in this section.
FRONT SUSPENSION 3-5
DIMENSION A
CHEVROLET TRUCK SERVICE MANUAL