Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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It's a tapered fit to the crankshaft, no key. And there is a tool that will make the job much easier.
Part Number(NNN) NNN-NNNNImpeller Removal Tool
I've linked the part number to a shopping search, or it can be ordered from any local MTD dealer. MTD is who made the machine for Sears.
Hope this helps!