Many hydrostats have the option for a centering spring on the swash trunnion shaft. The problem with a return spring is you have to hold it at the speed you want. Not handy for tilling or jobs where you want a steady sustained speed. For a FEL it may be handy. The resistance on mine is at the friction bushing at the bottom of the shaft. The hand lever offers none.
The engine had a bad noise which I originally assumed was the PTO or driveline. It wasn't.
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