| 摘要 |
<p>The circuit gives automatic warning of the depth of parts of agricultural machines. It has one distributor manually controlled from the driving cab and another distributor is controlled by a shoe in contact with the ground. A hydraulic actuator adjusts the height, and between the first and second distributor and actuator is an adjustable throttle with a by pass circuit having a non return valve. The first distributor has three positions, neutral, hand control, and automatic control for depth. The manual position uses the by pass circuit.</p> |
