SANY LATIN AMERICA
4-182
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.9.5.2 Swing priority control
Function
●
Pressurized oil from pump 1 bypasses
bucket 1 valve spool, and flows first to
swing motor valve spool to activate swing
fi
rst.
Operation
●
When signals from pump 1 pressure sen-
sor, arm pressure sensor and swing pres-
sure sensor meet the following conditions,
the controller activates the solenoid valve.
The solenoid valve conducts pilot pressure
oil to arm
fl
ow controller and limits the al-
ternate circuit of arm 1 valve spool. Swing
valve spool first ensures swing motor
power, preventing the counter acting force
when the arm is retracting from affecting
the positioning of the upper swing struc-
ture.
Operating condition
●
Swing pressure sensor: signal output avail-
able
●
Arm pressure sensor: signal output avail-
able
https://www.tractormanualpdf.info/