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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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