Chevrolet 1988 Light Duty Truck Repair Manual page 128

3B3-14 POWER STEERING
11. REMOVE AND INSTALL CHECK
VALVE
REMOVE
1. R em ove p a rts as show n.
R em ove check valve.
Install ch e c k valve.
12. ADJUST THRUST BEARING PRELOAD
A. B efore a d ju s tin g
be aring preload ,
ro tate the s tu b sha ft
back and fo rth to
drain all oil fro m
gear
Using spanner wrench
J-7624, tighten adjuster
plug until thrust
bearing is firmly
bottomed, 27 Newton
Metres (22 Ft. Lbs.
M ark h o using and
face o f a d ju s te r
plug. ---------------------
T u rn a d ju s te r
co u n te rc lo c k w is e u n til
m a rk on face o f ad ju ster
lines up w ith second
m ark on ho using.
Figure 28—Removing and Installing the Check Valve and Adjusting the Thrust Bearing Preload and Pitman Shaft " Over-Center" Sector
INSTALL
1. Install parts as show n
W ith sm all scre w d river, pry
c h e c k valve fro m ho using
C are sh o u ld be taken no t to
dam age threads w hen p ryin g
on edge o f ho using.
U sing a piece of
% tu b in g , 4 inches
long, c a re fu lly
drive the check
valve into the
ho using.
M easure back
c o u n te rc lo c k w is e
13mm (Vi") and place a
second m ark on ho using.
U sing pu n ch in no tch
tig h te n lock nut securely.
H old a d ju s te r plug to
m a in tain a lig n m e n t o f
the marks.
13. PITMAN SHAFT " OVER-CENTER'
SECTOR ADJUSTMENT
W hen gear is on center
fla t on stu b shaft is
no rm a lly on same side as,
and pa rallel w ith, side cover.
The b lo c k to o th on the P itm an
shaft is in line w ith the
ove r-ce n te r preload adjuster.
B. B ack o ff preload a d ju ste r C. Turn adjuster in until
u n til it stops, then tu rn
it in one fu ll tu r n .-i
W ith gear at cen ter
of travel, che ck to rq u e
to tu rn stu b shaft
(readin g #1).
torque to turn stub shaft
is 0.6 to 1.2 Newton Metres
(6 to 10 in. Lbs.)
more than reading # 1 .
Torque adjuster lock
nut to 27 Newton Metres
(20 Ft. Lbs.) --------------
P revent a d ju ste r screw
fro m tu rn in g w h ile
to rq u e in g lo ck nut.
F-04607