New item 2/25/17! Hydraulic motor drive sprocket used on the J70 center drive tillers. This is a 13 tooth sprocket, earlier models as well as the J72 mechanical drive tillers use an 11 tooth. You can update the older tillers by ordering this sprocket to increase the tine speed but you will need to lengthen the chain to compensate for the larger sprocket. Note: Not recommended for lower horsepower tractors unless the tilling width is reduced to 32".