COMPONENT OPERATION / Steering Valve

1. When the steering wheel is rotated to the left, spool (4) rotates. Pressure oil from the main pump flows in the order of port P - sleeve (3) - spool (4)sleeve (3) - housing (1) - gerotor (8).

2. Pressure oil from gerotor (8) flows in the order of housing (1) - sleeve (3) - spool (4) - sleeve (3)port L – the steering cylinders. The steering cylinders direct the machine to the left.

3. Returning oil from the steering cylinders flows to port R, flows in the order of housing (1) - sleeve (3) - spool (4) - sleeve (3) - port T, and returns to the hydraulic oil tank.

4. When pressure oil from the main pump flows to gerotor (8), gerotor (8) rotates to the left. Rotation of gerotor (8) is transmitted to sleeve (3) through drive (7), and sleeve (3) rotates to the left.

5. When sleeve (3) rotates by the same amount of spool (4), the passage between sleeve (3) and spool (4) is closed and the operation of the steering cylinders is stopped.

6. Therefore, gerotor (8) rotates in response to rotation of the steering wheel, and the steering cylinders are operated in response to the amount of turns of the steering wheel.