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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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