I am the not so proud owner of a X540 w/54" deck and 90 hours on it. I cut about 2 acres with it and the cut is absolutely terrible. I have used the deck leveling tool and the blade height tool both. I have changed blades to make sure they are straight. Nothing helps. The cut is very uneven and I am beginning to think the deck pullies are not level because the deck is stamped poorly. Have any of you ever checked the blade runout to see if one pulley is higher than the other or maybe unlevel on the deck? Frustrated JD owner.