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Well there's no bearing on the engine, aside from the crank bearings and those certainly aren't seized. There should be an idler pulley that the vacuum actuator presses against the belt, but that locking up wouldn't stop the belts from spinning the deck.


The most likely place is in the PTO jackshaft under the frame. That assembly is also what the axle pivots on IIRC. There are two bearings in that assembly that spin and if one of those seized up it would do what you're describing I would think. You should be able to tell by disconnecting the deck and just spinning that splined shaft and listening/feeling for excessive noise and play. #21 and #22 in the attached image

[ATTACH=full]145022[/ATTACH]


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