Hello Peter

A photo will help me to exactly understand what you need. To take off the gearbox (the one which have the “pat dec 1916?) seems easy: after scewing off the littles bolts as you say, with a wooden piece you can put apart the box taking care of the big gasket. May be you gear box is “glued” with years.
Don’t forget the two bigger bolts.
If you go to the forum “Gravely Tractor Club of America” you’ll find service manuals for english model D. Also you can ask to the “MERL” in Reading University for the same 1950 owner’s manuals and part lists.
If you need more ask me and excuse my limited english
AM

hi andre
what it is its the gear box that is conected to the wheel the casing spins around and as i said there is a bearing on the top right i will look up the numbers in the book and let you know shortly
thanks
pete

Peter

If I understand well this is an inside gearbox (147 in the book)which wears two bearing and the one in the bottom is hard to take off: you must have a special tool to do that, ask a mecanic or a garage worker
Or you talk about the big wheel bearing.
I join a pic, so you can put a sign to show where is the difficulty
regards
André

I’m so sorry Pete but my limited english vocabulary doesn’t allow me to explain better
I apologize and would you excuse me?
AM

Pete
After reading and reading I may understand what you need: to take off the bif wheel and its gearbox from the wheel
If I remember well there are two holes with thread in the wheel: you use atool used to take off pulleys (I don’t know the english word) and the wheel can jump out. Watch it’s hard work, so put oil and oil. After the gearbox comes easily
Is that what you need?
In this gear box there are felts gaskets(149) which are not available at all, so take a great care when you take the gearbox out. those are also in the 156 gearbox: usually there are two of them in each part
Do you understand?

hi there is a man called rollo man who has the register here in england
pete