The deck on my scotts mower is out of level. It is a 17 hp. With a 42 in. deck.

Place on level concrete, get down and loosen the adjustment arms, you may have to remove a hitch pin or two to do this. Or you may have a slot on the deck level height setting to remove a flap, and go all the way down, then loosen two wing type nuts and adjust the supports the same, tighten the wing nuts and try that.