Tom, I did a Roosa pump in my shop last spring that wouldn't start well. On the stand it tested fine. The owner was standing right there when I RETESTED it so the pressure was on. He kept saying "I can see it tests fine, but I know it wouldn't on the tractor." So out of desperation I pulled out a used nozzle from under the bench. It was from the same model of tractor. Cleaned it, reset the opening pressure and hooked it up to the test bench to spray into a rag. It would not crack this nozzle until the bench hit 850 rpm. I found the delivery valve seat was leaking. Had to back down the opening pressure of all six nozzles and then it started fine. Factory pressure on this unit was 3650psi so we had some wiggle room. You could have the same type of problem ,,, Al
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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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