That isn't exactly how I was taught the JD CC hyd pump operates. I was taught the pressure inside the crankcase exceeds the pressure on the springs on the pistons(4 or 8 depending on the size of the pump) therefore it pushes the pistons away from rotating shaft causing pumping to stop then when pressure in crankcase falls below system pressure then the pistons are pushed back against pump rotating shaft to pump oil again. Installing an open center valve on a CC without any alteration will not work very well at all. It will cause the pump to cavitate & run out of oil.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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