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BGB bearing/shaft problem - need advice

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Hello again, I have been away for the winter. My 918H is just used for mowing.

Anyway, last October I replaced the PTO clutch friction plate and bearing. Today I noticed the PTO smoking really badly. I took it back apart and noticed the bearing was already shot. Wallowed out on the inner part that seats to the BGB output shaft.

My thinking at this point is that just replacing the bearing again ($66!) would not fix the problem. Is it possible the output shaft is wore out enough to gnaw away the bearing that quickly? The shaft is another $100, but it's the task itself that has me concerned. Can this be done with the BGB in place and not have to spit the tractor in two?

Any thoughts on this would be greatly appreciated.

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