Operation - Hitachi ZW180 Technical Manual

COMPONENT OPERATION / Steering Pilot Valve

OPERATION

4 8 3 2
Sleeve (3), spool (4) and drive (7) are mutually
connected by pin (5). When the steering wheel (spool
Port L Port R
(4)) is turned, a relative displacement angle arises
between sleeve (3) and spool (4) due to the long hole
of spool (4).
The movement of the steering wheel is transmitted
only to spool (4), and port P (from the steering pump) is
connected to port R (to the steering valve) or port L via
sleeve (3) and spool (4).
Steering
wheel
Port T Port P
7 11 7
T4GB-03-04-007
11
6 10
9
Steering
wheel
2
T1F3-03-07-002
1 5 4 3 7 8
T3-4-3