Hitachi ZW180 Technical Manual page 133

Relief Valve
Pump Torque Control
Solenoid Valve
Parking Brake
Solenoid Valve
NOTE: The illustration shows the oil flow in neutral
condition of the pilot valve when the service
brake accumulators are pressurized, the
priority valve is open, and the pilot shut-off
valve is open.
SYSTEM / Hydraulic System
Bucket
Lift Arm
Pilot Valve
Pilot Valve
Pilot Shut-Off
Valve
A
Spring
Charging Block
Auxiliary Pilot
Valve (Optional)
To Service Brake
Circuit
Service Brake
Accumulator
Priority Valve
B
Pilot Pump
Pilot
Relief Valve
Hydraulic Oil Tank
PS 1
PS 2
X
Parking Brake
BR3
Pressure Sensor
PP
T2-3-17
T4GD-02-03-002