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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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