The work machine (1) has steering elements (8,9) that are arranged transversely at the operating handles (11,12) in the direction of the axis of driving shaft (5) connected with a chassis (4). A manually operable actuator of a control device is connected to a drive unit (3). Asetting and adjustment device is provided with a magnetic field generating permanent magnet formed without contacting an electronic sensor whose position relative to the position of the magnetic field by actuator is set and changed.
