belt tension

We have a 2023 RTV-X1100C that has been making an occasional screeching noise. At first, I suspected it might be an A/C belt issue. However, yesterday—while driving out of the woods—the noise became more noticeable, and the engine temperature started to rise whenever the screeching continued...

I purchased a used 917 flail mower which needed some work. I replaced the broken/missing flails, replaced the tension pulley and put a new V-Belt (C-52) on it. The belt was VERY tight. About 15 minutes into the first use (just mowing long grass, nothing too thick), it threw the V-belt and...