I have just scrolled up this tread and have seen a picture of your Greenfield.
Yours is an earlier type with the single centre nut or bolt holding the wheel to the axle.
This is a similar method as the MTD/White mower I had.
With this mower, I had to apply heat to the wheel rim hub and I used a puller with two bolts through the wheel rim.
Your wheel rim doesn't have the two holes in it like mine had though.
The MTD axles are parallel with two flats milles on the end to stop the wheels fron rotating on the axle.
I haven't worked on a Greenfield like yours but would imagine it to be similar to the MTD setup.
Maybe a photo of the side you have already removed might give us a little bit more info to go by.
