Hitachi ZW180 Technical Manual page 131

Service Brake
Accumulator
Check
Valves
Relief Valve
A
Spring
Charging Block
NOTE: The illustration shows oil flow when the
relief valve and the priority valve are closed
in response to pressure decrease in the
service brake circuit.
SYSTEM / Hydraulic System
B
Priority
Valve
Pilot Pump
T2-3-15
Brake
Pedal
Brake
Valve
Service Brake
Front Brake
Rear Brake
T4GD-02-03-001