Abstract: A vibration-free self-propelled harvester thresher has a threshing unit including a threshing drum and a threshing basket, a plurality of separating units each including a separating drum and a separating element located under the drum, and a device for jointly adjusting the separating elements in horizontal and vertical directions. The adjusting device includes two supporting elements on which the separating elements are mounted, guiding elements in which the supporting elements can slidingly displace in a horizontal direction, and walls provided with openings in which the guiding elements can be mounted adjustable in a vertical direction.