Hitachi ZW180 Technical Manual page 211

A
1 - Bucket Flow Rate Control
Valve
2 - Negative Control Valve
3 - Overload Relief Valve
(Bucket: Bottom Side)
COMPONENT OPERATION / Control Valve
7 6
4
4 - Overload Relief Valve
(Bucket: Rod Side)
5 - Overload Relief Valve
(Lift Arm: Bottom Side)
6 - Make-Up Valve
(Lift Arm: Rod Side)
9
E
7 - Restriction Valve
8 - Low-Pressure Relief Valve
9 - Main Relief Valve
T3-2-3
8 7
B
C
D
2
10 - Load Check Valve
(Arm Lift Circuit)
11 - Load Check Valve
(Bucket Circuit)
5
3
T4GB-03-02-004