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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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