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19 - 8
STEERING
•
WORMSHAFT
BEARING
"PRELOAD"
TORQUE
ADJUSTMENT
(1) Disconnect a n d remove t h e p i t m a n (steering)
a r m from t h e p i t m a n (sector) shaft w i t h Tool C-4150
(Fig. 4).
Fig. 4 Pitman (Steering) Arm Removal
(2) Remove the h o r n contact cover.
(3) Loosen the sector shaft adjustment screw lock-
n u t a n d un-thread the adjustment screw 1/2 to 2
t u r n s (Fig. 3). This w i l l relieve any f r i c t i o n load t h a t
could exist between the closely meshed b a l l n u t rack
and sector shaft gear teeth.
(4) T u r n the steering wheel to the r i g h t "stop" and
t h e n back 1/2 t u r n . Position Tool C-3380 (or a n ap-
propriate torque wrench) on steering shaft n u t .
(5) Rotate the steering shaft from t h e r i g h t "stop"
t o w a r d t h e straight ahead position w i t h Tool C-3380
w h i l e n o t i n g the indicated "preload" torque.
(6) T h e torque required to rotate the steering shaft
should be between 0.56 a n d 0.68 N»m (4 a n d 6 i n -
lbs). I f t h e torque is not w i t h i n t h i s range, a "pre-
l o a d " torque adjustment is necessary.
(7) Loosen the p l u g adjuster locknut (Fig. 2).
(8) T u r n the p l u g adjuster clockwise to increase the
" p r e l o a d " torque a n d counterclockwise
t o decrease
the torque.
(9) W h i l e preventing t h e p l u g adjuster f r o m rotat-
ing, t i g h t e n the locknut securely, and t h e n measure
the wormshaft bearing "preload" torque.
BALL NUT RACK/SECTOR
SHAFT
GEAR
TEETH
MESH (LASH)
ADJUSTMENT
The sector shaft gear adjustment screw (located i n
housing cover) raises or lowers the position of t h e
shaft to provide t h e correct mesh between t h e t a -
pered sector shaft gear teeth a n d t h e tapered b a l l n u t
rack teeth. This adjustment c a n be accurately com-
pleted only after t h e wormshaft b e a r i n g
"preload"
torque has been correctly adjusted.
(1) Rotate the steering wheel
g e n t l y
from
one
"stop" t o t h e other and accurately count t h e number
of rotations. T u r n t h e steering wheel back exactly
h a l f way to the center position.
(2) T u r n t h e sector shaft adjustment screw clock-
wise t o remove a l l t h e lash t h a t exists between t h e
b a l l n u t rack and sector shaft gear t e e t h , and t h e n
t i g h t e n t h e adjustment screw l o c k n u t w i t h 47 N»m
(35 ft-lbs) torque.
(3) Rotate t h e steering wheel approximately 1/4
t u r n away from the overcenter position. T h e n , w i t h a
torque wrench on t h e steering wheel n u t , measure
the torque required t o rotate t h e steering
wheel
t h r o u g h t h e overcenter position. T h e indicated over-
center drag torque should be 1.6 N»m (14 in-lbs). The
measured (drag) torque represents t h e t o t a l of t h e
wormshaft bearing "preload" torque a n d t h e b a l l n u t
rack/sector shaft gear teeth mesh f r i c t i o n load. Re-
adjust t h e sector shaft adjustment screw ( i f neces-
sary) t o obtain the correct drag torque.
(4)
After
t h e adjustment have been
completed,
place t h e front wheels i n a s t r a i g h t ahead position,
and, w i t h t h e steering gear a n d steering wheel cen-
tered, i n s t a l l the p i t m a n (steering) a r m lockwasher
and n u t on the p i t m a n shaft.
(5) T i g h t e n p i t m a n (steering) a r m r e t a i n i n g n u t
w i t h 237 N n n (175 ft-lbs) torque. I n s t a l l a replace-
ment cotter p i n .
(6) I n s t a l l the h o r n contact cover.
REMOVAL/DISASSEMBLY
REMOVAL
(1) Remove the t w o bolts f r o m t h e wormshaft-
to-steering shaft coupler.
(2) Remove the p i t m a n (steering) a r m f r o m the pit-
m a n shaft w i t h Tool C-4150 (Fig. 4).
(3) Remove the steering gear-to-frame bolts and re-
move t h e gear from t h e vehicle.
PITMAN SHAFT SEAL—REPLACEMENT
(1) Raise and support t h e vehicle. Place t h e front
wheels i n the straight-ahead position.
(2) Disconnect t h e center l i n k f r o m t h e p i t m a n
(steering) a r m .
(3) M a r k the p i t m a n (steering) a r m and the p i t m a n
shaft positions for i n s t a l l a t i o n reference and remove
the p i t m a n a r m from the p i t m a n shaft w i t h a p u l l e r
tool (Fig. 4).
(4) Remove the p i t m a n shaft seal w i t h a pointed
tool or a screw driver w i t h a s m a l l blade.
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