Hyundai R 160 LC-3, Service Manual

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2 - 10
Flow increasing function
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As the pilot pressure Pi decreases, the pilot piston(643) moves to the left by the action of the pilot
spring(646) and causes lever 2(613) to rotate around the fulcrum of point B. Since the pin(897)
is pressed against the large hole section(C) of lever 2 by the action of the return spring(654) via
the spool(652), pin(874), and feedback lever(611), the feedback lever rotates around the fulcrum
of point D as lever 2 rotates, and shifts the spool to the left. Port CL opens a way to the tank
port as the spool moves. This deprives the large diameter section of the servo piston of
pressure, and shifts the servo piston to the left by the discharge pressure P1 in the small
diameter section, resulting in an increase in the flow rate.
As the servo piston moves, point D also moves to the left, the feedback lever rotates around the
fulcrum of point C, and the spool moves to the right till the opening between the spool and sleeve
is closed.
643 654 651 652 613 646
B(E)
874
897
875
C
611
C
L
P
1
531
548
D
Small diameter
chamber
Servo piston
Large diameter
chamber