You are correct about the governor picking your engine rpms up when going up-hill, but your hydro is basically a hydraulic pump that turns a hydraulic motor. The extra force will cause it to slow down, just as a (hydraulic) front end loader will not lift a full bucket as fast as it will an empty one.
Maybe better explained by saying: Setting on flat ground with no added weight, or trying to pull a pulling sled. Even though you have the same engine rpm, you would really need to cram the lever forward to get the tractor and sled to move, whereas with no load… you already know how that works.
lol, the whole thing really is kind of deceiving, if you want a constant ground speed use your gear drive. The thing that bugs us hydro freaks with the gear drive is, you only have three ground speed choices.
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