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STEERING
19 - 9
(5) Inspect t h e condition of the steering gear l u b r i -
cant. I f i t is contaminated (e.g., contains m e t a l p a r t i -
cles), remove a n d recondition t h e steering gear.
CAUTION: A protective wrap must be used to en-
close the shaft threads/splines during the shaft seal
installation. If the shaft seal is installed over ex-
posed shaft threads or splines, the seal lip could be
cut or distorted and result in leakage after installa-
tion.
(6) W r a p t h e p i t m a n shaft threads/splines w i t h 0 . 1 -
m m (0.005-in) t h i c k shimstock (or a single layer o f
the t h i n n e s t plastic tape available) to protect the re-
placement seal d u r i n g i n s t a l l a t i o n .
(7) Lubricate t h e l i p of the replacement seal w i t h
chassis l u b r i c a n t . Slide t h e seal over t h e shimstock/
tape and shaft and into the steering gear housing re-
cess. Remove t h e shimstock/tape f r o m t h e shaft.
Complete t h e seal i n s t a l l a t i o n by t a p p i n g the seal
w i t h a s m a l l plastic m a l l e t to "seat" i t i n the housing
recess.
(8) W i t h t h e a r m and t h e shaft i n s t a l l a t i o n refer-
ence m a r k s aligned, position t h e p i t m a n (steering)
a r m o n t h e p i t m a n shaft.
(9) I n s t a l l t h e washers and t h e r e t a i n i n g n u t on
the p i t m a n shaft a n d t i g h t e n t h e n u t w i t h 237 N n n
(175 ft-lbs) torque. I n s t a l l a replacement cotter p i n .
(10) Connect t h e center l i n k to the p i t m a n (steer-
ing) a r m . T i g h t e n t h e r e t a i n i n g n u t w i t h 54 N n n (40
ft-lbs) torque. I n s t a l l a replacement cotter p i n .
(11) Remove t h e supports and lower t h e vehicle.
DISASSEMBLY
(1) Remove t h e flexible coupling.
(2) Position t h e steering gear i n a vise and clamp i t
in-place at t h e m o u n t i n g bosses only.
(3) Rotate t h e wormshaft from stop-to-stop a n d
count t h e t o t a l number o f rotations. Rotate t h e
wormshaft i n t h e reverse direction 1/2 o f t h e t o t a l
n u m b e r of rotations to center i t and the b a l l n u t .
(4) Remove t h e p i t m a n (sector) shaft adjustment
screw locknut. Remove the cover r e t a i n i n g bolts,
cover, a n d gasket (Fig. 5).
(5) Slide t h e adjustment screw head (Fig. 6) out o f
the p i t m a n (sector) shaft T-slot and remove i t a n d
the shim(s).
(6) Retain t h e shim(s) for "end-play"
measurement
d u r i n g assembly.
(7) Remove t h e p i t m a n (sector) shaft, t h e w o r m -
shaft bearing "preload" torque adjustment p l u g lock-
n u t , and t h e adjustment p l u g (Fig. 6).
(8) Remove t h e wormshaft and the b a l l n u t (Fig. 7).
(9) Remove (pry) the p i t m a n (sector) shaft and t h e
wormshaft seals from t h e steering gear housing (Fig.
8).
Fig, 5 Pitman (Sector) Shaft Removal
WORMSHAFT
AND BALL
NUT-DISASSEMBLY
(1) Remove t h e upper bearing from t h e wormshaft
(Fig. 6).
CAUTION: Do not allow the ball nut to rotate freely
and travel to either extreme end of the wormshaft.
This could damage the tangs at the ends of the re-
circulating ball guides (Fig. 6).
(2) Remove t h e r e c i r c u l a t i n g b a l l guide clamp r e -
t a i n i n g screws, t h e clamp a n d t h e guides ( F i g . 6).
Separate t h e half-guides a n d place t h e r e c i r c u l a t i n g
balls aside i n a container.
(3) H o l d t h e b a l l n u t over a cloth a n d remove t h e
r e m a i n i n g r e c i r c u l a t i n g balls f r o m t h e b a l l n u t cir-
cuits b y r o t a t i n g t h e wormshaft back and f o r t h u n t i l
the balls drop o u t on t h e cloth.
T h e r e a r e a t o t a l o f 50 r e c i r c u l a t i n g
b a l l s
w i t h i n t h e b a l l n u t a n d t h e g u i d e s (25 i n e a c h
c i r c u i t ) .
(4) Remove t h e wormshaft f r o m t h e b a l l n u t ( F i g .
6).
WORMSHAFT
AND BALL
NUT-CLEANING
AND
INSPECTION
(1) Clean a l l t h e components i n a cleaning solvent
and d r y t h e m w i t h a clean cloth and/or
compressed
air.
(2)
Inspect
each
component
for wear,
scoring,
cracks, nicks a n d surface p i t t i n g . Replace as neces-
sary.
WORMSHAFT
AND BALL
NUT-ASSEMBLY
CAUTION: The ball nut teeth are wider and deeper
on one side than on the other. When assembling
the wormshaft and ball nut, position the ball nut so
that the wider/deeper side of the teeth is closer to
the housing cover opening after installation.
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