| 摘要 |
<p>The system has an electrohydraulic valve (44) and a hydraulic steering valve (19) that is operated by a steering wheel unit (21). The electrohydraulic valve and the hydraulic steering valve separately pressurize a steering cylinder (9, 10). The electrohydraulic valve and the hydraulic steering valve together pressurize the steering cylinder during movement of the steering wheel unit.</p> |
