I don't know anything about your particular tractor, but here's an idea for you based on a past problem I encountered with a CAT branded Perkins....and I know MF liked Perkins.
IF it has a turbo, and a flame start style intake heater, with the fuel line going to it, change the heater.
What can happen with those is the fuel valve in the heater goes bad. When the engine is loaded, and the turbo pressurizes the intake manifold above whatever pressure it's taking to leak past the valve, it puts air in the system.
From there you may, or may not have to bleed the system for it to start and run again....until intake pressure hits that magic number and she shuts down again.
In my case the engine would restart immediately, run all day making a little bit of air, but simply wouldn't carry the compressor at a full load.
I had this happen on an engine driven air compressor, and nearly lost my religion before I figured it out.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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