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b)
Control unit : '
The contra!
unit
located
below
the steering
wheel,
consists
of a distributor
slide-valve
( C ) which.
when
hydraulic
pressure
on either
side of it is the same
ensures
in chamber
1 the necessary
pressure
for the
steerinq
piston
Movement
of rockers
E when turning
to the riqht
F
E
D
C
Return
to reservoir
HP
QV
re
Wh <',I s I? cw%g .'
Within
permitted
clearance
(1 J ):, shaft A rotates
pinion
F Pinion
B and pinion
D are then in mesh f NII~/ nl(,<.l1~)ji(nll>~
lillk cd lo II1 1' ~/~~c,~i/lg /~ir/io/l 1. Rockers
E tilt,
and cause
slide-valve
C to move.along
its bore
_ Upward
movement
: Chamber
1 of hydraulic
ram supplied
in HP
- Downward
movement
Chamber
1 of hydraulic
ram linked
to the return
to the reservoir
lic,Inr~i
lo fm.silio~i
0 I ~~yiiilihrif~vf
Movement
of rack causes
movement
of its control
pinion.
pinion
B and pinion
D Pinion
F being
then locked
in posi-
tion,
pinion
D acts on rockers
E. which
in turn brinq
back slide-valve
C to its position
of equilibrium.
NOTES
:
1) Manual
operation
is ensured
by shaft A being
mechanically
connected
to pinion
B after cancellation
of clearance
a J )).
2) The steering
rack is hydraulically
locked
for any steering
position,
which
ensures
great directional
stability
of
the vehicle.
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