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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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