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How do I remove a stuck mandrel pulley from a riding mower?

I have a 917.270514 Craftsman Riding Mower. On the mower deck, the shaft of one mandrel pulley no longer rotates smoothly, and needs to be replaced. I attempted to hold the blade while turning the nut on top of the pulley, but the "nubs" that hold the blade rounded off. Without the blade, there's nothing to keep the shaft from turning. Next, I soaked the nut in WD40 overnight. Then I drove a large back-out (reverse thread) screw in the blade's bolt hole to hold the shaft, and held that while turning the pulley nut. First, one of the nuts that holds the mandrel to the deck sheared off. Then the 3/4" back-out screw snapped, and the nut still hasn't budged. What do I try next??

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Craftsman , Lawn Mowers , Lawn & Garden
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2 Answers from these members:
Manage My Life
by Manage My Life
April 10th, 2008
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Manage My Life
by Manage My Life
April 10th, 2008
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