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A alternate way of heating the assembly is to send more than a few amps through the shaft with a welding transformer.Shaft expands, shrinks, expands, shrinks if you use it in cycles.You willl be limited by the duty cycle of the welder.Alternatively you can adapt an old microwave transformer(s)...

Drill out the rivets, replace the bearing and rivet, bolt or weld back together.

Have you been driving on an incline and sucked CC oil into the CC breather tube?

Drill out the old shaft and tap thread for 1/2" bolt with same thread as broken off piece and sufficient length.Drill and tap just 1/2 " past bearing.Screw new high strength bolt into shaft and secure with JB weld on thread.Cut off bolt head and Bob's your uncle.

I think your problem is the driving on an incline.Depending on which way the tractor is leaning it will give the CC breather pick-up access to the engine oil which will then get sucked into the engine and gives you the problem that you describe.Figure out which way not to incline to prevent this...