Need help removing drum chipper flywheel.

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Dodik

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HI all,
I have what I believe and was told Asplundh 1966 12" chipper serial c1560r4s, its straight 4 from probably ford.

I got most of what was wrong sorted except getting grease to flywheel side bearing.
It is one of those that have a hidden zirc between flywheel and fan cover. It had a long extension sticking out but after few pumps of grease that extension broke off. Thats where I am at, trying to reinstall the extension.
Fan and shroud came off no problems. Now there was a collar with a set screw on the shaft, removed that and now I am a bit stumped what to do next.
Flywheel has only 4 holes for the fan that are like 24" apart. And that is it.
The shaft has a threaded end though for 3/4"-10 coarse bolt (same size that holds an anvil) and from what i can see appears to be a part of the flywheel.
I dont want to brake stuff, but is it possible that you drive a bolt into the shaft and it separates the flywheel?

I have a 580ck backhoe to lift/support it just looking for ideas on how to brake it free. Looking inside the key slot, there is a key about 1/2" below surface of the flywheel face. but the shaft sticking out appears to be part of the flywheel. there is no seam between shaft and flywheel.
 

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Did you get this removed? It looks different than mine as mine had no collar. I had a fan with the four bolts like yours, mine has a taper bushing that goes in from the back side of the flywheel. Looks like there was an evolution of these machines.
 
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