JD 670 steering wheel removal

[RustyShackleford]

I have a John Deere 670 Compact Utility Tractor that needs the headlight switch replaced (corroded and frozen up). First step to getting behind the instrument panel is to remove the steering wheel, but I just can't figure out how to do it. I removed the little plastic cap and the big nut and washer underneath, but it will not budge. It does not seem corroded down around the threaded top of the steering column. I did a half-assed pulling job by wedging a C-clamp against the top of the threaded section and around the bottom of the steering wheel hub, but I could only pull so hard, and it was at an angle, and the steering hub is kinda plastic-y and I felt it might break. So I guess I need to rent/borrow a real honest-to-god pulley puller. But I can't help but feel there's something else I need to undo for the wheel to come off. I bought a PDF of a big service manual online, but it's useless - the section on headlight switch replacement simply says "remove steering wheel" but then goes into great detail about how to undo the nut that holds the switch in (duh !). Any suggestions would be appreciated !

 

[Zebrafive]

I bet it's supposed to just pull off. Are there any tapped holes for a steering wheel puller? I doubt there are.
I have had good luck pulling car/truck (older pre airbag) steering wheels by putting the nut back on, loose to protect the threads, (just less than flush), then using my legs to put pressure behind the wheel, hitting the nut with a hammer.

 

[RustyShackleford]

Well, no luck with a gear puller; I was pulling on a large-size crescent wrench just about as hard as I could (on the puller's center bolt). I also tried some Liquid Wrench. Wanted to try heating with a torch, but there's too much plastic around. So I guess it's got to be some kind of impact, as Zebrafive suggests.