Looks like a farm store belt from the pictures.
I wouldn't expect it to last long on a mule drive application what with all the twisting.
Something is not right if it is touching the mule drive.
Holes and/or hanger pins worn and wallered out allowing the ass'y to hang crooked?
Wrong length belt fitting too loose and hanging down touching somewhere?
Miss adjusted tension causing looseness?
Worn pullies and or pully bearings?
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