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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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