Hi Group, I own an H-70 tiller. I believe it will work on all 200,400, 3000,and 4000. There is a removable section for rougher ground or 200 series tractors. Mine seems to work great. I am to believe that it turns a little slower than the J-70. There is a gear or gears you can swap to bring it to the speed of a j-70. Someone please correct me if I am wrong, Bill Gebhardt