Shredding belts.

Hello, Recently upgraded my slant to a 360. All is great except I have now been through three power steering\fan belts within 100 miles. They are literally grinding away some how. The engine and fan have belt dust built up on them. The belt is wearing evenly until it wears enough not to spin everything then sits in one spot till it ejects. No burs on the pullys at least that would catch my finger. PLEASE HELP!!!