Without the Christmas Tree valve, the belly pump lever operates an internal valve to pressure the ports. With it, you lock it back and flow through the Christmas Tree full time. Then all control is with that valve.
The internal bypass is large and heats the fluid less than an external valve will so you might want to rig the system so you leave the belly pump lever forward unless you are going to use the hydraulics.
The pump is always engaged to the transmission lower shaft so it spins any time the clutch is engaged, whether or not the transmission is in gear. The PTO also runs off this shaft.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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