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19-32
STEERING
•
(5) Move t h e spool valve t h r o u g h t h e valve body
u n t i l t h e stub shaft locating p i n hole i n t h e spool
valve i s visible and the spool valve is flush w i t h the
notched end o f the valve body.
(6) Carefully insert t h e stub shaft i n t o t h e spool
valve u n t i l t h e stub shaft locating p i n is aligned w i t h
the locating p i n hole i n the spool valve (Fig. 25).
CAUTION: Ensure that the stub shaft cap notch is
aligned with the valve body pin before installing the
valve body in the steering gear housing.
(7) A l i g n t h e notch i n the stub shaft cap w i t h the
locating p i n i n the valve body and press t h e spool
valve a n d t h e stub shaft i n t h e valve body (Fig. 26).
L O C A T I N G
PIN
UPPER
C O N T A C T
SURFACE
S T U B S H A F T
C A P N O T C H
J8919-49
Fig. 26 Stub Shaft Installation
(8) L u b r i c a t e the stub shaft cap-to-wormshaft O-
r i n g seal w i t h power steering f l u i d and position i t i n
the cap groove.
PITMAN SHAFT AND COVER—INSPECTION
(1) Inspect t h e cover-to-housing contact surface.
(2) Inspect t h e p i t m a n shaft sector teeth, upper
contact surface and bearing/seal contact surface (Fig.
27).
(3) Replace the cover and t h e shaft i f they are se-
verely w o r n , scored or p i t t e d . I f t h e p i t m a n shaft ad-
j u s t m e n t screw head fits loose i n the T-slot, replace
the p i t m a n shaft.
RACK PISTON/WORMSHAFT—DISASSEMBLY
(1) Remove the b a l l r e t u r n guide clamp.
(2) Place t h e complete assembly on clean paper and
remove t h e b a l l r e t u r n guides, t h e wormshaft w i t h
S E C T O R TEETH
BEARING/
SEAL
C O N T A C T
SURFACE
J8919-50
Fig. 27 Pitman Shaft Inspection
a n arbor tool, and t h e r e c i r c u l a t i n g balls. E n s u r e
t h a t a l l 24 b a l l s a r e r e m o v e d a n d r e t a i n e d .
(3) Remove the arbor tool f r o m the wormshaft.
(4) Remove the teflon piston r i n g and t h e O-ring
seal f r o m t h e rack piston (Fig. 28).
RACK PISTON/WORMSHAFT-ASSEMBLY
(1) Lubricate a l l o f t h e components w i t h power
steering f l u i d .
(2) I n s t a l l t h e O-ring seal i n t h e rack piston groove
(Fig. 50). D o n o t a l l o w t h e O - r i n g seal t o b e c o m e
t w i s t e d d u r i n g i n s t a l l a t i o n .
(3) I n s t a l l t h e teflon piston r i n g over t h e O-ring
seal.
(4) Insert t h e wormshaft completely i n t o the rack
piston.
(5) I n s t a l l t h e r e c i r c u l a t i n g balls i n the rack piston
b y alternately i n s t a l l i n g one black b a l l followed b y
one silver b a l l u n t i l a t o t a l o f 18 balls have been i n -
stalled i n t h e inner r e t u r n guide hole (Fig. 29). A f t e r
i n s t a l l i n g each b a l l , press i t downward t o provide
space for t h e next b a l l .
(6) Rotate the wormshaft counterclockwise (viewed
f r o m the steering shaft end) t o route the balls i n t o
t h e c i r c u i t . T h e w o r m s h a f t w i l l s p i r a l o u t o f t h e
r a c k p i s t o n as i t i s r o t a t e d a n d t h e b a l l s a r e c i r -
c u l a t e d .
(7) F i l l one b a l l r e t u r n half-guide w i t h petroleum
j e l l y and i n s t a l l the six r e m a i n i n g balls i n the b a l l
r e t u r n half-guide (Fig. 30). Ensure t h a t the balls i n
t h e half-guide are installed alternately b y color (i.e.,
a black b a l l followed b y a silver ball) and are i n a l -
t e r n a t i n g color sequence w i t h the balls previously i n -
stalled i n the rack piston.
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