Hello. I am new to this site and i need advice. I have a John Deere ztrac commercial mower that has a 48 inch deck that I bought 3 -4 years ago. I mow approximately 7 acres that are rough and want to finish as soon as possible with the least problems. The first year I loved my mower and my yard looked wonderful. Since the first year I have not had a mowing month go by that it doesn't break down. The screw that holds the spring on the deck continues to shear off causing the belt to fly off. Over the past couple of years, I have paid enought in repairs to buy a very expensive mower. The JD dealer keeps saying that it is my fault and that no one has that problem. I do not mow fast as I would bounce off the mower even with the seat belt fastened. I finally had enought and called JD and spoke with a supervisor. After explaining what was happening, she did not offer any help. Even though I bought an extended warranty that doesn't expire until 5/2010 she told me that it had expired. So..... has anyone else had this problem? What would be a reliable mower that can handle a rough 7 acres without breaking repeatedly?