I think your repair is in the right direction. If your tractor sees little use, keep it as is.
But if you plan to use your N much, I would suggest following Soundguy's suggestions. The damage you describe is in a higher stress (i.e., greater load) area, and a strong repair will be needed if you plan to work the tractor.
The JB weld repair does no harm and may work well for you. If you find that it is not holding up to repeated use, then make a more thorough repair.