Outline - Hitachi ZW180 Technical Manual

COMPONENT OPERATION / Charging Block

OUTLINE

The charging block is installed in order to supply
pressure oil from the pilot pump not only to the service
brake accumulator and the brake valve by giving them
priority, but also to the parking brake and the steering
pilot valve.
The charging block consists of the priority valve, relief
valve, pump torque control proportional solenoid valve,
pilot relief valve and check valve.
Port Mounting
Service Brake
Accumulator (Rear)
2
3
Pump Torque Control
Proportional Solenoid
Valve
T3-7-1
Port Mounting
Service Brake
Accumulator (Front)
5
13
Port Mounting
Pilot Accumulator
17
T4GD-03-07-002