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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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