Also, on the Neuss (German engines) used in some IH tractors and equipment that used the rotary injection pump, the governor was hydraulic. Later pumps went to mechanical governors also. A mechanical governor is a balancing device that a given throttle setting determines the pressure exerted against the weights with a spring and on a diesel engine, when the rpm's drop, the weights over come the spring pressure and give the engine more fuel to maintain the set rpm's.
On a gasoline engine, the governor does same thing except it opens the throttle valve (butterfly) in carburetor and allows more air which in turn draws more fuel through carburetor.
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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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