Chief-Seems no one knows the answer for sure, so I am going to throw in my 2 cents. Like you I am guessing the hydraulic pump is always running and always pumping and always maintaining a given pressure. If the tractor is not moving, the oil is simply moving thru a bypass. When you move the pedal, the oil is diverted thru a different path to turn the wheels forward or backward. Since the pump is maintaining a given pressure, the engine load would be the same with the tractor moving or sitting still. ????

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