I have seen PTO's that were working perfectly fine, and then from sitting in a neglected state wouldn't even dis-engage because rust and dirt crept in between the plates and disc.
Even though you have the "button to button" gap adjusted correctly, you still need to develop an air gap between both plates and thd disc when the button is pushed in.
I think you need to get it off and apart, cleaned up, and adjusted correctly, and you will be OK.
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