Belt keeps jumping off!
 

I have a 124 and the belt keeps jumping off. I have tightened and loosened the belt several times, but still end up with the same results. Not sure if anyone has any tricks or helpful hints to pass on. Thanks to all!

Forgot to mention that is a mower deck.

Check for alignment between all the pullies, sometimes the mule pulley gets misaligned to the drive pulleys, make sure the mule pulleys are free to turn and free to pivot on the mule shaft if designed to.. Also check all the deck bearings for excessive play, that the pulleys are not worn out, and that they are all in line. If your deck tensioner is seized up or has a broken spring that will cause jumping belts too. If your deck bearings are stiff and do not rotate freely without a belt on it that might be the problem too. Basically you need to pull the covers and check EVERYTHING...

It will either come down to one of three things. (A) Misalignment of the pulleys, (B) Excessive load (dry bearings), or (C), wrong type of belt.

The belt I have on the deck is an A80 50. All the pulleys seem to be fine and turn freely. I watch the belt as i slowly engaged the belt drive to the deck and noticed that it was twisting as it went over the main pulley on the deck. Not sure if that helps anyone.