alton sanders

I have been suffering the same problem with belt slipping off since I first purchased mower.  I have bought 5 belts and only used mower one summer.  This year I started the mower engaged the blade belt and off it went.  Looking hard for solution to problem.  I spotted the belt is right up against the brake lever adjustment on the left side under the engine.  There is one on the right side as well.  The one on the right has plenty of room from the belt.  The left one is worn and polished by the belts contact with it. There is no way it should be like that.  I don't see how to fix it.  Looks like the engine should be mounted a little more to the right.  I bought it new at tractor supply co.  Well at least I know what the problem is.  A very poorly assembled product. $3,400.00 for a major pain in the rear and the belts are High too.  Sure wish I had bought a cub cadet.