Sounds like the injection pump does need repair, you can confirm it this way. Loosen the two screw timing cover on the side of the pump, allowing fuel to leak out. Start the engine, if it runs fine WITH the fuel leak, but slows down and/or dies when the cover screws are tight then the pump needs repair. The retainer ring is breaking apart inside, causing the internal housing pressure to rise, shutting down the pump. Just repaired a JD 4010 pump with the same trouble..
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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