That's normal wear, but it is time to replace the gear.
You'll need to remove the flywheel, hammer the old one off.
To get the new one on, heat the gear only, (not the flywheel).
You can heat it with an acetylene or propane torch, or in the oven, or on the BBQ grill. Heat it evenly to about 400*F.
Have the flywheel laying on a firm flat surface, cleaned up and ready to receive the new gear.
Using welding gloves or oven mits, lay the gear on the flywheel. Work quickly as it will cool fast. It should drop on, but have a small hammer ready just in case. It needs to seat fully against the stop flange on the flywheel.
Some gears have a bevel on one side of the gear, some are flat. If flat, it won't matter which way it goes on. If beveled, that side will go to the side the starter gear engages. In your case the bevel will go toward the transmission side.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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