Hitachi ZW180 Technical Manual page 286

Layout
1 - Service Brake Accumulator
(Front)
2 - Adaptor
3 - Port M2
(To Front Side of Brake Valve)
4 - Check Valve
5 - Port M1
(To Rear Side of Brake Valve)
6 - Service Brake Accumulator
(Rear)
7 - Service Brake Pressure Sensor
8 - Port P (from Pilot Pump)
COMPONENT OPERATION / Charging Block
1 2
22
21
20
9 -
10 - Pilot Relief Valve
11 - Port DR (To Hydraulic Oil Tank)
12 - Port DR2 (To Hydraulic Oil Tank)
13 - Port PS1
14 - Port X
15 - Parking Brake Pressure Sensor
3 4
4
19
Priority Valve
(To Steering Pilot Valve)
(To Main Pump Regulator)
T3-7-4
5
6
7
8
9
10
11
12
13
17
14
15
16
18
16 - Port BR3 (To Parking Brake)
17 - Port PS2
(To Main Pump Regulator
and Ride Control Valve (Optional))
18 - Pilot Accumulator
19 - Port PP (To Pilot Shut-off Valve)
20 - Parking Brake Solenoid Valve
21 - Pump Torque Control Proportional
Solenoid Valve
22 - Relief Valve
T4GD-03-07-001