by an operating person who for this purpose can open a lid 11 of the drum housing 13 to thus enter the working space behind work drum 8 on the rear track assemblies 5 as seen in the moving direction respectively one seat 27 is articulated for movement about vertical axes by two pivot arms 29 31 on side walls 15 of the track assemblies 5 so that the seats 27 can be pivoted as desired in a horizontal plane the operating person while positioned on one of the seats 27 can operate a remote control 33 for an auxiliary drive 20 to be coupled to the drive line 18 in this arrangement the work drum 8 is arranged in a raised position so that the tools 14 are out of engagement with the ground surface by means of the auxiliary drive 20 work drum 8 can be rotated by a predetermined rotational angle so that the next row of tools 14 can be brought into a convenient mounting position the arrangement of the tools 14 on the outer surface 12 of work drum 8 is best seen in fig3 upon activation of auxiliary drive 20 work drum 8 can be rotated by a specific angular degree or for a specific length of time the torque of auxiliary drive 20 is higher than the moment of inertia of work drum 8 and drive line 18 in the switched off or decoupled state of drive motor 6 in this regard the torque should be higher only by an amount sufficient.