It looks like it is attached like most JD steering wheels. Gently pry out the center cover (#1), remove the nut (#2) and if you are lucky just pull the wheel up off the spline. If it's like most it will be tight on the spline. If so, put the nut back on to protect the threads and while pulling up on the wheel with your knees give the nut a wack with a hammer. I also saw someone use a blunt nosed bit in an air chisel and it loosened the wheel in 2 seconds.
When reassembling, apply a bit of Never Seize to the spline.
I have never done it but a buddy did his like this. Take the nut off and wrap a ratchet strap around the wheel he then hooked other end to the ceiling pulled the strap tight as if he were lifting the tractor. And went to bed in the morning the wheel was off.