Working depth adjustment from the cab

A coupling rod between the depth control elements provides uniform adjustment at both the front and rear of the machine. The working depth can be adjusted infinitely variably from the tractor cab, to permit individual reaction to the changing conditions within a field. An easy-to-read scale helps with the orientation for the driver. As an alternative, the working depth can also be mechanically adjusted. A spindle is provided on each of the support wheels for this purpose.