The hydro belt on my Toro Z-master has only been lasting about a month and now it's starting to wear out even quicker. The belt starts to crack and large chunks are missing when I have to replace it. I've replaced the idler arm assy. and checked for any rough pulleys or obstructions and can't find anything wrong. I can replace it in about fifteen minutes but the belt costs $28. I tried a cheaper belt but it broke within two weeks. The belt also feels dried out and really stressed. Is it possible that the hydros are running hotter than normal causing extra stress on the belt? When the mower was new the belt lasted much longer.