Hello Jeep welcome to YT! One thing you can do to check if the injection pump is the problem is loosen the little plate with two screws on the side of the pump so it can leak fuel. Maybe loosen about as much as a faucet would flow in a continuous stream but not so slow that it turns to individual drips. Then start the tractor and see if it will continue to keep running. If so the break down of the governor ring is likely your problem. You mention loosening the return line on the pump, the fitting that the return line screws into is a check valve to help hold fuel in the pump when the engine is off. Pieces of the governor ring get in it and plug it. When pressure builds up in the pump housing the delivery plungers cannot move out to pickup the proper amount of fuel so the engine quits. If the engine runs fine with the plate loose likely the governor ring is the issue. You can also pull that plate off and see if there is debris in there that looks like coffee grounds, which also confirms the ring is bad. If you pull that you might want to make sure you have the tractor in a place where you want to pull the pump off otherwise it may require a bit of bleeding of air to restart it. I really should not tell you this but as a TEMPORARY FIX you can unplug that check valve or even go so far as to knock that check ball out with a punch and your tractor will then run fine. However, given time, parts will be hammering against each other metal to metal in the pump and running it long term like this can do additional damage. I do know that in some cases on Deeres the info about the gears staying in time is correct, but I cannot say for sure if that applies to your model someone else will have the answer that.
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