I have a 220 volt Lincoln wire welder that I tinker around with and would turn this over to someone with more experience due to overhead position. I'll not go back to all the suggestions with little chance of succeeding but will talk about one that is downright insane. Removing with cutting torch. The outcome would be catastrophic. The instant plug is penetrated,there will be an explosion that burn's operator to death and sustained fire that destroys tractor along with anything nearby. I'm ashamed I didn't point this out earlier but better late than never. Oil mixed with oxygen can combust without source of ignition. Contemplate what happens if the combination is brought in contact with cutting flame. We can only hope others are wise as Kando and don't give it a try.