A gear pump pumps when the gears turn so that the meshed area of the gears moves opposite of the oil flow. If you can see, or imagine) the teeth coming toward you where they mesh, the oil flows away from you. The rotation direction depends on which shaft is driven wrom which end, and in which direction. The volume of the area between the teeth carries oil in that direction and the meshing squeezes it out into the exhaust/pressure port. Jim
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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