| 摘要 |
<p>The building site crane with a lower pivot comprises a carriage (2) with front steering wheels (8a,8b) and rear steering wheels (9a,9b). The truck receives the crane tower and the jib. The tower and jib are able to rotate about a vertical axis (3a). Both the front and rear wheels are driving wheels. The crane has a pump (13) connected through a hydraulic line (15) to a hydraulic motors (16,17) which drive the front and rear wheels. The hydraulic motors are equipped with automatic braking.</p> |
