I have a Toro Super Z 52 inch. Now bear with me as I'm not the best with mechanical terms. I love the mower but have had one major problem. There are four bolts that hold the hub in place, than the lugs come out of that and that is where the tire goes on. Well a few months after I purchased the mower these bolts must have gotten loose and then snapped. This happened again early this summer. Now, the other day they all loosened up but I caught it before they snapped. I tightened them up and finished out the day and dropped it offer at my dealer. They are contacting Toro about this problem. Has anyone else had this problem with their Toro or any other mower for that matter? Any advice would be greatly appreciated. If anyone needs anything explained about my problem I will do my best to explain it. Thanks.