Hitachi ZW180 Technical Manual page 251

Section A
Section B
2
Port Pb
1 - Spool
2 - Overload Relief Valve
*: Refer to T3-5-1
COMPONENT OPERATION / Steering Valve
*
*
Port B
4 4
3 - Overload Relief Valve
4 - Load Check Valve
7
Port P Port DR
Port T
Port LS
Port A
5
7
*
Section C
6
5 - Variable Orifice
6 - Fixed Orifice
T3-5-3
1
3
Port Pa
4
7 - Passage A
T4GB-03-04-003
T4GB-03-04-006