This disc harrow can easily adjust to any width. Thus, for example, rows in vineyards of differing widths can be worked with no elaborate assembly. To do this, the tools are synchronized hydraulically. Since the sliding bearing should be maintenance-free, precise, compact, durable and highly resilient, liners were mounted directly in the passages of the machine frame. Shafts run through this guide, to which the rows of discs are fastened.