The closed center hyd. system on a JD uses a piston pump at the frt. driven off the crank. Piston pumps can't suck fluid up so it needs fluid to be supplied to it from a transmission driven gear pump. On the syncro trans. pushing the clutch pedal down stops the transmission driven pump. On the power shift the clutch pedal is not working a clutch but just a "inching valve" as they call it. I guess I used the wrong term. You don't run out of fluid just the flow of fluid.
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Today's Featured Article - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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