I just acquired a Ariens 1540 936034 tractor from a buddy and found that when cutting thicker grass the belt that goes from the PTO to the mower deck slips, thereby not cutting the grass, just leaving it swirled. On weedy areas, it seems to cut fine, or I have to use the high settings on the deck height and keep lowering it each time I go over the same area....very time consuming. The belt was changed in the fall, and is the correct one, and is still the correct length, outside measurement is 65" it is listed a s 64" belt and is 1/2" wide. The tensioner spring seems weak, but the tensioner arm is almost hitting a cross member already, there is only about 1/4" of space, so a tighter spring will just make the arm hit the cross member. The pulleys don't seem too worn, and they are very expensive to replace as they seem to come as an assembly, not just the pulleys themselves. I haven't found anything else that is obvious and am wondering if a 1/2" shorter belt be a solution?
Any help is appreciated,