What would cause a PTO to not disengage?

What would cause a PTO to not disengage?
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What causes PTO failure?
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What would cause a PTO to not disengage?
A bent or partially sheared roll pin could cause this condition. Punch the roll pin out to disassemble the lever and de-tent from the shaft. Once removed if you don't see anything obvious you can check the operation by turning the shaft without the de-tent assy to see if that will disengage the PTO.