When new I would imagine it would have slid right off. Penetrating oil of some kind now.I pretty much agree that its not a bolt but attach to the rim but how do I get the rim to come off the axle? I need to replace the seal. No matter how much Ive pulled on it, its not budging.
I've had luck, when using a puller for situations like this, getting a good amount of tension on the puller and then strike the center puller bolt with a heavy hammer. Repeat as necessary.You might be able to rig up some form of puller using those holes in the rim, but if it's too stuck that may bend the wheel.
Done yourself a world of good there pulling it down while still free.
Just be patient and keep oiling. You need to let the oil soak in and that takes awhile maybe a couple of weeks. That key is not helping in this situation. Sounds like it is really, really corroded. I have used up several cans of penetrating oil on stuff like this. Slow and steady will get you there. If you are using heat, I am willing to bet that you are not using enough to do this job. You are at the point of heating up seals and tires for this job. It took years for this to corrode together and it will not come apart in a couple of days with out ruining parts. Hang in there you'll persevere. Good luck.No matter how much we have lubricated the wheel it is not budging. We even heated it and still nothing. What gives?