I've thought about removing a PTO clutch for a "dedicated" plow tractor, but then decided, you never know when you might want to put a generator, or tiller or whatever on it someday. So I've always rebuilt the PTO and put it back on--trying to keep the tractor complete. Also, is a re-sale concern.
I'd leave it on unless it's coming apart and needs to be removed for safety reasons.
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