The gear rotor charge pump as its name implies, "Charge Pump" pumps oil to another pump most likely a swash plate type pump used in hydrostat systems. A Swash plate type pump has a variable output thus giving the machine different speeds by pushing the pedal or lever farther or pulling the lever or pedal and reversing the oil flow to the drive motor allowing the machine to back up.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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