Good running to bad in an instant

[Zorm]

Folks, got a 2003 BX2200. Bought the tractor used about 2 years ago. Has belly mower and LA211 front loader. I was working with it yesterday doing loader work, filling in and leveling two septic tanks. As I was smoothing out my last run for the day, I was backing up and all of a sudden, the engine started shaking violently and I had no power, then it died. I tried to restart but when it finally did, it’s was running like it was before it died. I thought maybe I ran out of diesel, so filled the tank. Tried to start again, took a few turns, then started and ran like crap again, I thought maybe it needed time but it eventually died. Moving the throttle does nothing.

Need some help here please. Bad injector?, injector pump?, crappy fuel? stopped up filter?

 

[MapleLeafFarmer]

My initial guess is crappy fuel.
Would be my first and easy to check and clean.
Alge grows in the fuel between the layer of water / fuel and when alge colony gets large enough it falls out of suspension and can start clogging stuff down stream from the tank.
I would start with a clean from head to tail replacing / cleaning filters, etc.
I never owned exact model so not sure what you have for filters and separators but what you describe seems to fall under category that we call around here the green snot of death.