a soil cultivating machine comprising soil cultivating members which are rotated about upwardly extending axes and carried by a gear box which extends transversely of the intended direction of operative travel whereas behind the cultivating members a supporting roller is provided that is vertically adjustable on the gear box by means of carrying arms . legal provisions in force in various countries limit the maximum widths of the machine for highway travel , for example , to three meters . the gear box can be limited to the prescribed dimension , by , at least at one end of the gear box , providing an end plate which extends above the gear box and pivotally engaging on the inboard side thereof a carrying arm for the roller . in this manner the outer surfaces of the two end plates for the gear box are exactly at a relative distance corresponding to the maximum width allowed while at the same time there is no sacrifice in the width along the gear box required for connecting the roller .