Why yth24v48ls is eating belts?

[LMPPLUS]

As several have said there appears to be some misalignment causing a lot of pressure on the belt or something is rubbing the belt.

 

[kjonxx]

Its obvious that something is eating the inside of the belt, check eng pully for debri's and then all areas where it runs. I agree that pic shows pulley misalignment which maybe is causing it. My guess idlers are loose moving up and down.

 

[RevB]

The belt in picture is a $30 aramid fiber from Amazon made in India, the OEM belts are $70 for the fabricated deck. The owners manual states belt needs 30 ft lbs tension but I am not sure how to measure that?

A spring scale attached to the idler and a stationary point on the deck with zero as the full slack, zero tension point and then tighten adjustment to 30lb.

Where would the fish scale be hooked to the belt?

My guess is it's not hooked to the belt but to the tensioner idler pulley. Otherwise if there is a specification for the belt it would be amount of deflection of the belt but you can't do that because the tensioner would continually be taking up slack to the limit of the spring. That sort of measurement is for things like a belt between two or more stationary points.

 

[Kenneth]

I have the same mower, and had the same problem. It would take 5-20 minutes, I'd smell rubber burning, then it would throw the belt. Changed out the tension spring and it felt like the tension was unchanged from the original. But it immediately stopped having that problem, and that was two years ago.

 

[bentrim]

From the posted picture there is something rubbing the inside of the belt. This caused the damage pictured overheats and destroys the belt. Be sure to check all around the belt for a guide on the wrong side of the belt or a loose parts hanging down an rubbing the belt. If the belt was loose the edges of the belt would be excessively worn and slipping would be a problem.