Sorry to hear about Fred's passing.
I do have more info on the wheels locking up on Troy-Bilts 5524 Storm snowblowers.
When I tore mine apart , it seems that there is needle bearings in one of the drive gears on the hex shaft.
In Tory-Bilts infinite wisdom (or lack of) they did not supply a way to lubricate them.
So mine froze on the shaft , after water got in. and was allowed to sit for the summer.
I was able to free up the bearings , and drilled a hole in the shaft (for a grease fitting).
Hopefully this will prevent this from happening again.
I hope this helps anyone else that may have the same problem in the future.