SANY LATIN AMERICA
4-177
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
Function
●
Use the joystick pilot pressure signal di-
rectly as the hydraulic pump discharge
control signal. Pilot pressure is applied on
the valve stem and, on the other hand, is
collected by the controller. The controller
keeps the discharge amount of the hydrau-
lic pump at the speci
fi
ed value of the cor-
responding pilot pressure according to the
functional relation between the set hydrau-
lic pump discharge amount and pilot pres-
sure. During combined operation, the set
discharge amount of each operation shall
be added.
Operation
●
When the work equipment is operating, the
controller collects the signal of pilot pres-
sure sensor, and determines the control
discharge amount of pump 1 and pump 2
according to the pressure signal.
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