Hitachi ZW180 Technical Manual page 146

Steering Stop Circuit
(Refer to the COMPONET OPERATION / Steering
Valve group.)
•
When either of the left or right cylinder is at the
stroke end, the stop valve contacts the frame.
Then the stop valve closes and pressure oil to the
steering valve from the steering pilot valve is
blocked.
Stop
Valve
Contact External
Force
Steering
Pilot Valve
NOTE: The illustration shows the oil flow when the
stop valve is closed during the right
steering.
SYSTEM / Hydraulic System
Steering Cylinder
Hydraulic
Oil Tank
•
Consequently, as the steering valve spool is in
neutral, supply of pressure oil from the main
pump to the steering cylinders is stopped.
Steering Valve
Main Pump
Pilot Pump
T2-3-30
Spool
Stop
Valve
T4GB-02-02-004