When you pull out the bypass rod, "bypass" is initiated by physical pressure relief in the "center" section of the hydro.
The bypass arm connected to the rod you pull does not have to move very much to do that, and it does not "click" into any position.
Operating the bypass has no physical effect on the differential gears so the spinning of the wheels as you describe is normal operation of differential gears.
It sounds as though from sitting, things are sticky inside the hydro.
My suggestion would be to try and get it running where it sits and things may get freed up in there.
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