I have a 2006 Super Mini Z that I bought last spring. I have been having a problem with the deck belt. The belt keeps slipping down on the pully that has the adjustments on it. This began to happen last spring initially, so I increased the tension on the spring. This did seem to remedy the problem for a brief period. Now I have had to adjust the pully so tight that I only have about 4 links of chain left. Also, last week, while I was mowing I noticed the smell of rubber, so I shut the mower off and checked the deck belt. It had moved down on the pully and was rubbing on the white plastic that is on the top of the deck. It has actually worn a groove into the plastic and I am having a difficult time keeping the belt on the pully. This mower only has 30 hrs on it. Should this belt be bad already? Also, I am going to have to replace the white plastic pieces on the deck. Any suggestions on the problem or how this happened? Thanks in advance.