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Hypro d252 pump on JD 750 drill

   I bought a used 750 no-till drill and it came with a liquid fertilizer system, but obviously no instructions.  I have a Hypro D252 pump, a 300 gallon tank, and a manifold by Blumhardt.  The pump is driven off of the seed shaft.  What do I need to know to calibrate this set-up?  Will a change in speed affect the rate or pressure?  How do I regulate the pressure and do I need a return line?

  This is my first attempt at using liquid and either I'm confused or missing something.




PS the drill also has the half speed kit if it matters.

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