Chevrolet 70 1969 Series, Shop Manual

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FRONT SUSPENSION 3B-6
Steering Knuckle
Cap Screw
Upper King Pin
Bearing Cap
King Pin Bearing Cap
Gasket
Lubrication Fitting
Shim
Draw Key
Stop Screw Lock Nut
Stop Screw
10 Thrust Bearing
11 Lower King Pin
Bearing Cap
12 Cap Screw
13 King Pin Bearing Cap
Gasket
14 Lower Bushing
15 O-ring Seal
16 Upper Bushing
17 King Pin
Figure 2 — Steering Knuckle Construction (F070 AxleI
steering gear. Refer to S T E E R IN G S Y S T E M (SEC.
9) of this manual for installation instructions.
2. Turn in the right stop screw so that screw
will not contact its stop when wheels are turned
to extreme right.
3. With wheels turned to extreme right, hold
right wheel tightly against right turn position, then
turn out stop screw until it contacts firmly against
its stop. Turn screw about one turn more against
its stop, and tighten lock nut. Check position of
tire. If tire has less than 5 /8 " clearance from any
chassis obstruction, adjust screw to obtain clear­
ance.
4. Repeat steps on left side.
FRONT AXLE REPLACEMENT
All component parts of the front axle assem ­
bly except axle center can be replaced without re­
moving assembly from vehicle, if necessary. Minor
straightening with suitable equipment can be ac­
complished with assembly in vehicle. When the
front axle requires a complete overhaul, the as­
sembly can be replaced as described in following
procedures.
N O T E : The letter " F " is stamped on front of
spring pad on F-090, F-110 and F-120 Series axles;
this indicates front of axle. If this identification
mark is not visible, make a punch mark on front
of spring pad before removing ends from I-beam.
If I-beam is not marked, it could be installed back­
wards, and camber would be wrong.
R E M O V A L
1. Jack up and support vehicle frame to re­
lieve load from springs.
2. Remove wheels and hubs. Disconnect brake
lines at axle. Disconnect drag link from steering
arm.
3. While supporting axle center with suitable
jack, remove spring U-bolts. Lower assembly and
remove from under vehicle.
IN S T A L L A T IO N
1. Place assembly on dolly and roll into posi­
tion under vehicle. Raise axle up against springs,
making sure spring center bolts enter alignment
holes in spring seats. Be sure caster angle shims
if used, are in place between spring and axle. At­
tach axle to springs, tightening U-bolts as des­
cribed in " F R O N T SPRINGS" (SEC. 3C).
2. Install hubs and bearings as described in
" F R O N T HUBS A N D BE AR IN G S" (SEC. 3D). Con­
nect drag link as directed in S T E E R IN G S Y S T E M
(SEC. 9) of this manual. Connect brake lines. If
hydraulic brakes are used, bleed brakes as des­
cribed in "H Y D R A U L IC B R A K E S " (SEC. 5A) of this
manual.
3. Check stop screws and adjust as previously
described. Check front end alignment and adjust
as necessary.
FRONT AXLE OVERHAUL
Steering knuckles, king pins, bushings, and
thrust bearings can be replaced without removing
front axle from vehicle. Minor axle straightening
can also be accomplished without removing assem­
bly from vehicle. Preliminary inspection can be
made while axle is still mounted. These inspec­
tions should aid in determining the amount of re­
pair necessary. Check front end alignment as di­
rected previously under " F R O N T E N D A L IG N ­
M E N T " (SEC. 3A). Inability to correctly align
wheels indicates that axle center or steering knuckle
is distorted, tie rod bent, or knuckle bushings are
worn beyond limits.
STEERING KNUCKLE
(F070 AXLE)
D ESC R IPT IO N
The king pin is held in place with a tapered
draw key, installed as shown in figure 2,. The draw
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L