P A R 3 8 - 3 9
O P E R A T I O N O F H Y D R A U L I C S Y S T E MS
C H A P 2, SEC I V
relay valve, where it is sent to the right-gear-
ed
steer
clutch,
through
the
geared
steer
coolant line.
(5) The right-geared steer clutch is ex-
h a u s t e d , a f t e r u s e , t h r o u g h t h e b a l l c h e ck
valve (upper) located between the steer feed
and steer coolant feed lines.
( 6 ) I n r i g h t s t e e r i n t h i r d g e a r , t he
right-drive clutch (output clutch) is released,
the right-geared steer clutch is engaged and
supplied with coolant, and the left-drive clutch
( o u t p u t c l u t c h ) i s e n g a g e d a n d c o n t i n u e s to
d r i v e .
b . Fourth Gear, Full-left Steer (fig. 16)
N o t e . R e f e r t o p a r . 5 6 a n d f i g . 3 2
for the torque path through the power
t r a i n.
( 1 ) T h e h y d r a u l i c s y s t e m w i l l f u n c t i on
in fourth gear steer in the same manner as
d e s c r i b e d f o r f o u r t h g e a r s t r a i g h t t r a v e l in
par. 34, above, except for the position of the
steer valves and the flow of oil to the drive
clutches and steer clutches.
(2) In left steer, the steer control shaft
i s r o t a t e d c o u n t e r c l o c k w i s e . T h i s r o t a t i on
moves the right-steer valve upward while the
left-steer valve moves downward. Flow to the
left-drive clutch (output clutch) is blocked. A
r e g u l a t e d s t e e r f e e d p r e s s u r e i s s e n t t o t he
steer relay valve. The steer relay valve sends
oil to the left-geared steer clutch, through the
left-geared steer clutch apply line.
( 3 ) T h e f l o w t o t h e r i g h t - d r i v e c l u t ch
(output clutch) is not interrupted and the clutch
continues to drive the right output. The right-
steer valve supplies steer coolant feed to left-
g e a r e d s t e e r c l u t c h .
T h e l e f t - g e a r e d s t e er
clutch apply pressure can exhaust through the
l o w e r c h e c k v a l v e ( b e t w e e n s t e e r f e e d a nd
steer coolant feed lines) and the geared steer
coolant line, when application of steer is dis-
continued.
3 9 . H Y D R A U L I C S Y S T E M F U N C T I O N -
R E V E R S E R A N G E , S T E ER
a . R e v e r s e 1 G e a r , F u l l - r i g h t S t e er
—
( f i g . 1 7)
N o t e . R e f e r t o p a r . 5 7 a n d f i g . 33
for the torque path through the power
t r a i n .
( 1 ) T h e h y d r a u l i c s y s t e m w i l l f u n c t i on
i n r e v e r s e 1 - g e a r s t e e r i n t h e s a m e m a n n er
as described for reverse l-gear straight travel
in par. 35, above, except for the position of
the steer valves and the flow of oil to the drive
clutches and brakes.
( 2 ) R e f e r t o p a r . 3 7 a ( 2 ) t h r o u g h ( 5 ) ,
above, for an explanation of the function of the
steer valves and oil flow to the drive clutches
and brakes.
(3) In reverse 1 gear, right steer, the
right-drive clutch (geared steer clutch) is re-
leased, the right brake is applied and supplied
with coolant, and the left-drive clutch (geared
steer clutch) continues to drive the left-output.
b . R e v e r s e 2 G e a r , F u l l - l e f t S t e er
—
( f i g . 1 8)
N o t e . R e f e r t o p a r . 5 8 a n d f i g . 34
for the torque path through the power
t r a i n.
(1) The hydraulic system will functioning
r e v e r s e 2 - g e a r s t e e r i n t h e s a m e m a n n e r as
d e s c r i b e d f o r r e v e r s e 2 - g e a r s t r a i g h t t r a v el
in par. 36, above, except for the position of
the
steer
valves
and
oil
flow
to
the
drive
c l u t c h e s ( o u t p u t c l u t c h e s ) a n d g e a r e d s t e er
c l u t c h e s .
(2) Refer to par. 38b(2) and (3), above,
for an explanation of the function of the steer
valves and oil flow to the drive clutches and
g e a r e d s t e e r c l u t c h e s .
( 3 ) I n r e v e r s e 2 g e a r , l e f t s t e e r , t he
l e f t - d r i v e c l u t c h ( o u t p u t c l u t c h ) i s r e l e a s e d,
the left-geared steer clutch is applied and sup-
plied with coolant, and the right-drive clutch
continues to drive the right output.
4
3
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