Chevrolet 70 1969 Series, Shop Manual

Page: 454 / 913

STEERING SYSTEM 9A-3
3. Turn steering wheel G E N T L Y in one direc­
tion until stopped by gear "stops" or by reaching
end of travel, then back away one full turn.
C A U T IO N : Do not turn steering wheel hard
against "stops" when linkage is disconnected from
Pitman arm as damage to ball guides may result.
4. Attach spring scale (J-544-01) at rim of
wheel as shown in figure 4. Pull on scale in a line
at right angle to wheel spoke and measure the
amount of pull required to keep the wheel moving.
If worm bearings are properly adjusted, reading
on spring scale should be between 1-1/2 and 2
pounds.
If pull is not within 1-1/2 to 2 pounds, worm
bearings require adjustment. If "rough" or "lumpy"
action is noted during check, worm bearings are
probably damaged. Steering gear should then be
removed, disassembled and bearings examined. If
worm bearings do not require adjustment, adjust
Pitman shaft lash as described later in this section.
Adjust worm bearings as follows:
W O R M BEARING A D J U S T M E N T
Type 553-D and 554-D Steering Gear
1. Loosen adjuster lock nut at shaft end of
steering gear and turn w orm bearing adjuster
screw clockwise until there is no perceptible end
play in the worm.
2. Using spring scale (J-544-01), check steer­
ing wheel rim pull as outlined previously. Turn
adjuster screw until a pull of 1-1/2 to 2 pounds is
7 8 9 5 10
1 Housing End Cover Bolts
2 Housing End Cover
3 Adjustment Shims
Lower Worm Bearing
Ball Nut Stop
Worm Shaft
Ball Guide Clamp
Back-up Adjuster
Back-up Adjuster Lock Nut
Filler Plug
Worm Upper Bearing
25 24
12 Steering Gear Housing
13 Steering Shaft
14 Pitman Arm Nut
15 P itm an A r m N ut W a s h e r
16 Pitman Arm
17 Packing and Retainer
18 Housing Bearings
19 Side Cover Bolt
20 Side Cover
21 Side Cover Bearing
22 Lash Adjuster Lock Nut
23 Lash Adjuster
24 Lash Adjuster Retainer
25 Lash Adjuster Washer
26 Pitman Shaft
27 Drain Plug
T-2953
Figure 2— Type 568-D Steering Gear (Typical)
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L