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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