Chevrolet 70 Series 1970, Service Manual

Page: 681 / 841

STEERING SYSTEM 9-2
Steering gear a s s e m b lie s , w hile s im ila r in
construction, vary in s iz e and mounting, depending
on truck m odel application. R efer to "M odelA ppli-
cation Chart" p rev io u sly .
The m ajor d ifferen ces in the ste e r in g gear
a sse m b lie s are d escrib ed in the follow ing text.
NOTE: R efer to "Steering Gear Adjustm ents"
la ter in th is sectio n for adjustment of Pitm an shaft
la sh , back-up adjuster, and worm thrust bearin gs.
The type 553-D and 555-D steerin g gear a s ­
se m b lie s shown in figure
1
have an adjuster a s ­
sem bly at shaft end of gear housing fo r adjustment
of w orm thrust bearing; lip type o il s e a ls at s te e r ­
ing w orm and Pitm an shaft; sh im s for adjustm ent
of Pitm an shaft lash , and bushings in gear housing
and sid e co v er. A back-up adjuster is u sed on
som e steerin g g ea r s to p revent the w orm shaft
from flexing up and down.
\\J
16 15 14 13 12 11 10 9 8
TYPE 553D STEERING GEAR
25
jL_
16 15
TYPE 554D AND 5550 STEERING GEAR
1 Lash Adjuster Lock Nut 12
2 Side Cover 13
3 Side Cover Bolt 14
4 Lock Washer 15
5 Clamp Retainer Screw 16
6
Back-up Adjuster * 17
7 Back-up Adjuster Lock Nut* 18
8
Pitman Arm Nut 19
9 Lock Washer 20
10 Pitman Shaft 21
11 Pitman Shaft Oil Seal
Housing Bushing
Steering Gear Housing
Pitman Shaft Sector Gear
Side Cover Bushing
Side Cover Gasket
Lash Adjuster Shim
Lash Adjuster
Expansion Plug
Worm Thrust Bearing
Ball Guide
*Some Models
22 Adjuster Lock Nut
23
Cup and Adjuster A ssem bly
24 Adjuster Worm Thrust
Bearing Oil Seal
25
Steering Shaft
26
Upper Worm Thrust Bearing
27 F iller Plug
28
Worm Balls
29
Pitman Shaft Sector Gear
30 Ball Nut
31
Worm Shaft
t
-6900
Figure 1 —Type 553-D and 555-D Steering Gear (Typical)
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL