| 摘要 |
A mobile agricultural machine for achieving improvement in travel performance during direction change. In a combine where right and left travel crawlers (3) and (4) supported by drive sprockets (39) and tension rollers (42) are installed to right and left track frames (1) and (2) through track rollers (40), and where the right and left travel frames (1) and (2) are provided through crawler elevation arms (31) and (32) in an elevation action controllable manner tension rollers (42) are provided in a ground contact direction of the travel crawlers (3) and (4) in a movable manner. <IMAGE>
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