SANY LATIN AMERICA
4-42
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
Action of reducing fl ow rate
●
When command current I decreases, the
solenoid proportional pressure reducing
valve secondary pressure P2 will decrease,
and guide piston (643) will move to the left.
However, as spool valve (652) moves, out-
put pressure P1 is introduced into the large
diameter chamber of the servo piston via
the port cl. On the other hand, output pres-
sure P1 is introduced into the small diam-
eter chamber of the servo piston and servo
piston moves to the right via are difference.
The inclination becomes smaller.
●
As servo piston (532) moves to the right,
the feedback lever swings with point A as
the pivot and the valve sleeve moves to the
left. Through this movement, the opening
portion between the spool and the valve
block is slowly closed. The servo piston
stops moving when the opening portion is
completely closed.
P1
P1
A
808
954
643
079
652
651
627 646
801
924
611
532
806
953
ZX225-1102007
Tilt angle small
P
SV
a
ZX225-1102008
Type of regulator
KR3G-0E11-AV
Rotating speed (min
-1
)
2050
Adjustment of max.
fl
ow
Adjusting screw (954) screw-in (rotation)
+1/4
Flow rate change (L/min)
-5.9
Adjustment of min.
fl
ow
Adjusting screw (953) screw-in (rotation)
+1/4
Flow rate change (L/min)
+4.7
Adjustment value of the regulator
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