Hitachi ZW180 Technical Manual page 280

Full Stroke (Output Diagram: Between E and F)
1. When the control lever is fully stroked, pusher (2)
moves downward until it contacts the shoulder
part of the casing.
2. At this time, spool (6) is directly pushed by the
bottom of pusher (2). Therefore, although
pressure at the output port is raised, hole part (7)
on spool (6) is not closed.
3. Consequently, pressure at the output port side is
equal to pressure at port P.
NOTE: Stroke dimension
determines the total stroke of the lever.
COMPONENT OPERATION / Pilot Valve
E of pusher
Pilot
Pressure
(2)
T3-6-22
E
D
C
A B
Lever Stroke
Output Diagram
F
T523-02-05-001