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19 - 30
STEERING
•
VALVE BODY AND STUB SHAFT-DISASSEMBLY
CAUTION: The valve body is a precisely manufac-
tured unit with components selectively fitted to con-
form to tolerances as close as 0.00082 mm (0.0004
in). The unit is hydraulically and mechanically bal-
anced during manufacture. If replacement is neces-
sary, the complete valve body must be replaced. To
avoid possible damage, the valve body should not
be disassembled unless absolutely necessary. If the
valve spool damper O-ring seal requires replace-
ment, remove the valve spool only as instructed in
the following procedure.
( 1 ) H o l d t h e valve body i n both hands w i t h t h e
stub shaft downward a n d t a p t h e e n d o f t h e stub
shaft l i g h t l y against t h e workbench u n t i l t h e stub
shaft cap disengages from t h e valve body (Fig. 2 0 ) .
( 2 ) Remove and discard t h e stub shaft cap-to-worm-
shaft O-ring seal.
LOCATING
PIN
Fig. 20 Stub Shaft Cap Disengagement
CAUTION: Do not pull the stub shaft out too far be-
yond the specified distance because the spool
valve could become cocked in the valve body.
(3) P u l l o u t w a r d o n t h e cap end o f t h e stub shaft
u n t i l i t clears the valve body b y approximately
6.35
m m
( 1 / 4
i n ) .
( 4 ) Carefully disengage t h e stub shaft locating p i n
from t h e hole i n t h e spool valve and remove t h e stub
shaft from the valve body (Fig. 2 1 ) .
( 5 ) Rotate t h e spool valve a n d remove i t f r o m t h e
valve body (Fig. 2 2 ) . I f t h e spool v a l v e becomes
cocked, carefully r e a l i g n i t a n d t h e n remove i t .
STUB
SHAFT
J8919-45
DAMPER
O-RING
SEAL
Fig. 21 Stub Shaft Removal
TEFLON
RINGS {3)
STUB
SHAFT
O-RING
SEAL
SPOOL
VALVE
O-RING
SEALS (3)
VALVE
BODY
J8919-46
Fig. 22 Valve Body & Stub Shaft Disassembly
(6) Remove t h e damper O-ring seal f r o m t h e spool
valve ( F i g . 22). Discard the O - r i n g seal.
(7) C u t t h e teflon rings a n d t h e i n n e r O-ring seals
(located between t h e teflon r i n g s and t h e valve body)
and remove t h e m from the valve body. Carefully c u t
the rings w i t h either a knife or diagonal pliers.
VALVE BODY AND STUB SHAFT-INSPECTION
(1) Clean a l l t h e components i n cleaning
solvent
and open a l l of t h e fluid passages b y b l o w i n g w i t h
compressed a i r . I f t h e stub shaft locating p i n or t h e
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