That is not the correct oil for your hydro but I don't think that would cause your issue. Your machine came with the high dollar "Synthetic Blend Drive System Fluid Plus" from the factory and that is the recommended replacement. I run Rotella 15w-40 in my 3000 machines without any issues.
Have you looked at all the bushings and linkages in the drive pedal system? I don't own any 2000 series machines but I know the 3000 series have a bunch of cheap plastic bushings that need to be replaced pretty often.
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