SANY LATIN AMERICA
4-184
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
Function
●
Control travel mode.
Operating condition
●
When Hi speed travel mode on the monitor
is enabled.
Remark:
When one side of the tracks is lifted off the
ground by the work equipment and rotating,
pressure at one side of the pump increases,
which makes the lifted track rotate very fast.
When the machine is traveling under Hi speed
mode, even if work equipment is being op-
erated (work equipment pressure sensor is
switched ON), travel mode remains in Hi travel
mode.
Operation
●
When the travel mode is set at LO speed,
the swash plate angle of the travel motor is
the largest, and travel speed is low.
●
When the controller receives the signal
from the travel pressure sensor under the
conditions below, it activates the solenoid
valve. Then, the solenoid valve conducts
pilot pressure oil to the swash plate angle
control valve of the travel motor, and re-
duces the swash plate angle to increase
travel speed.
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