Mike if the bearing in the pulley locks up as you said you can't disengage the PTO, but if the bearing that is on the inside locks up it will stop the engine because that part is held to the engine by an anti rotation stop. I bought a 1641 that the owner told me the engine was locked up, turned out to be a bad bearing. The red arrow points to the bearing I'm talking about. This style and the triangle shape PTO will both do the same thing.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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