The same thing happens on my 54" deck. Can't figure a fix so I'm just glad for the idler release handle. Do you have a problem with the belt twisting on the deck?
Not twisting so much on the deck, but twisting enough from the deck to the PTO to cause it to pop off. Changed out the PTO to one from a Broadmoor and it's all fixed. May need to shim it down slightly at some point because it sits high enough don't want it to pop off if the deck is too low now.The same thing happens on my 54" deck. Can't figure a fix so I'm just glad for the idler release handle. Do you have a problem with the belt twisting on the deck?