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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