Chevrolet 70 1969 Series, Shop Manual

Page: 453 / 913

STEERING SYSTEM 9A-2
shimmy, loose or hard Steering and road shocks,
a careful check should be made of front end align­
ment, shock absorbers, wheel balance, and tire
pressure for possible causes.
N O T E : Before making any steering gear ad­
justment, check lubricant in gear housing and fill
to proper level, if necessary, as directed in L U ­
BRICATION (SEC. 0) of this manual. Tighten all
mounting bolts to torque recommended in "Speci­
fications" at end of this section.
Procedures for checking and adjusting the
steering gear must be performed in sequence given
in the following paragraphs:
Always check worm bearing adjustment first,
and adjust if necessary, before making Pitman shaft
lash adjustment.
N O T E : Before making any adjustments on the
steering gear, loosen back-up adjuster lock nut
(if used); then loosen back-up adjuster.
C H E C K IN G W O R M BEARING A D J U S T M E N T
1. Disconnect drag link, idler link, or con­
necting rod from Pitman arm. Note relative posi­
tion of linkage and Pitman arm so parts may be
reassembled in same relative position. Refer to
"Steering Linkage" later in this section for cor­
rect procedures.
2. Loosen lock nut and turn lash adjuster (fig.
3) a few turns counterclockwise to relieve load
from worm bearings and to provide clearance be­
tween the sector gear and worm ball nut.
16 15
TYPE 554D STEERING GEAR
Lash Adjuster Lock Nut
Side Cover
Side Cover Bolt
Lock Washer
Clamp Retainer Screw
6 Back-up Adjuster
7 Back-up Adjuster Lock Nut
8 Pitman Arm Nut
9 Lock Washer
0 Pitman Shaft
1 Pitman Shaft Oil Seal
12 Housing Bushing
13 Steering Gear Housing
14 Pitman Shaft Sector Gear
15 Side Cover Bushing
16 Side Cover Gasket
17 Lash Adjuster Shim
18 Lash Adjuster
19 Expansion Plug
20 W orm Thrust Bearing
21 Ball Guide
22 Adjuster Lock Nut
23 Cup and Adjuster Assembly
24 Adjuster W orm Thrust
Bearing Oil Seal
25 Steering Shaft
26 Upper W orm Thrust Bearing
27 Filler Plug
28 W o rm Balls
29 Pitman Shaft Sector Gear
30 Ball Nut
31 W orm Shaft
1 2936
Figure 1 — Type 553-D and 554-D Steering Gear (Typical)
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L