Small Engine Troubleshooting Problems? Ask a Mechanic Now.
It will be the brake hub. It does go on the tapered drive motor haft and will need to be pulled off with a puller. See attached.
They are driven into the hub, they are not loose, but can be replaced. They have to be tight, or would not hold when the lug nuts are tightened.
Hard part will be puling the hub off the drive motor, then the studs can be driven back , out of the hub. New studs installed and slip the hub back on and tighten the big nut.
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Did you get the parts ?