Hitachi ZW180 Technical Manual page 139

Service Brake
Accumulator
Check
Valve
Relief Valve
Spring
Parking
Brake
Solenoid
Valve
Charging Block
No Signal for
Parking Brake
Release
NOTE: The illustration shows oil flow when the
relief valve and the priority valve are open
in response to pressure increase in the
service brake circuit, and also oil flow when
the parking brake is applied with the
unexcitement of the parking brake solenoid
valve.
SYSTEM / Hydraulic System
Priority
Valve
Parking Brake
Pressure Sensor
Pilot
Accumulator
Pilot Pump
T2-3-23
Brake
Pedal
Brake
Valve
Service Brake
Front Brake
Rear Brake
Parking Brake
Released
Applied
T4GD-02-03-005