I pull mine with a JD5400. HP to pull one isn't as important as your 3pt lift rating, and the total weight of the tractor. I know I wouldn't want to try it with a 40Hp. My tractor weighs over 6000#, and I still know it's back there when I raise it up. If you are worried about HP, a pull type handles better with lighter less powerful tractors, I think GP says a 40hp will handle one.