Chevrolet 70 1969 Series, Shop Manual

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STEERING SYSTEM 9A-4
Figure 3— Adjusting Sector Gear Lash (Typical!
obtained on spring scale at steering wheel.
3. Tighten adjuster lock nut to torque recom­
mended in "Specifications.”
Type 568-D Steering Gear
Proper adjustment of worm bearings is ob­
tained by adding or removing shims between steer­
ing gear housing and top cover or end cover (fig. 2).
Shims are available in thicknesses of 0.002",
0.005", 0.010”, and 0.030".
1. Drain lubricant from gear housing, then re­
move top cover or end cover and shim pack. Dis­
card one thin shim and reinstall balance of shims.
2. Check steering wheel rim pull as previously
described. Reading on scale should be within 1-1/2
to 2 pounds. Readjust worm bearing by adding or
removing shims until correct adjustment is ob­
tained (fig. 5 or 6).
3. Refill gear housing with lubricant specified
Figure 4 — Checking Steering Wheel Rim Pull (Typical!
Figure 5— Installing End Cover Shims (568-Dl (Typical)
in LU B R IC A T IO N (SEC. 0); then check wheel pull.
P IT M A N S H A F T LA SH A D J U S T M E N T
1. Center steering gear by turning steering
wheel from extreme right to extreme left positions,
counting the exact number of turns. Turn wheel
back exactly half way, to center position. Mark
wheel at top or bottom center with a piece of tape.
2. Loosen lash adjuster lock nut and turn ad­
juster screw (fig. 5 or 6) clockwise to remove all
back lash between gear teeth. Tighten lock nut to
25-35 foot-pounds torque, then check steering
wheel rim pull as outlined previously. Measure
greatest pull as wheel is pulled through center
position. Rim pull should be 2-3/4 to 3-1/4pounds.
3. If rim pull is not within specified limits,
loosen lock nut and turn lash adjuster to obtain
proper wheel rim pull. Always check wheel rim
pull after lock nut has been tightened.
4. If steering gear is equipped with a back­
up adjuster, turn adjuster in until it bottoms, then
back off 1/8 to 1/4 turn and tighten lock nut.
5. After all adjustments have been completed,
reconnect linkage to Pitman arm; adjust linkage.
Figure 6— Steering Gear Adjustment Points
(Type 568-DJ (Typical)
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L