Hitachi ZW180 Technical Manual page 247

COMPONENT OPERATION / Steering Pilot Valve
Right Steering
When the steering wheel is turned to the right,
pressure oil from the brake/pilot pump flows in the
order of port P - port R – the steering cylinder,
operates the steering valve and directs the front
wheel to the right.
Returning oil from the steering valve flows in the
order of port L - port T and returns to the hydraulic oil
tank.
Neutral
When the steering wheel is not turned, pressure oil
from the pilot pump acts on port P in the steering pilot
valve. However, pressure oil does not flow to the
steering valve as it is blocked by spool (4). Therefore,
the steering cylinder is not operated.
T
4
T3-4-5
L
T R P
P
T4GB-03-04--010
T4GB-03-04--011