Hitachi ZW180 Technical Manual page 267

At Neutral
Port P
1- Disc
2- Push Rod
COMPONENT OPERATION / Pilot Valve
Port T
(A)
Output Port
T4GB-03-05-009
3 - Piston
4 - Spring Guide
1
2
3
4
5
6
Fine Control Hole
7
5 - Balance Spring
6 - Return Spring
T3-6-9
(Clearance of Part A: 0)
T4GB-03-05-010
7 - Spool