Hello Gary. I have got exactly the same problem. i have tried penetrating oil. Beating it with a baulk of timber using a lump hammer from the opposite side. Applied heat to the wheel axle and beat it again. No luck. Next step is to try using a gear puller. I will probably have to make one to fit. Will let you know how i get on. Failing that i will probably grind it off and stick a new very copper greased wheel on.
Roy Briggs
June 2009