Don't get caught up with thinking that it is not an open center valve. As it was said before, if it wasn't an open center, the pump would immediately build up back pressure and dead head itself killing the engine, or exploding the pump or some other weak linl in the plumbing.
Make sure you have the supply and pressure and return side hoses connected correctly.
Provide the pump specs. You should not have any more than a 10gpm or so pump. Anything greater, and you are running through the 5 gal of fluid many times a minute causing alot of heat build up. You say you paid $300 for a pump. From similar pumps that I have seen that look like yours. a $300 pump is rated at much higher than 10gpm.
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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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