One more strategy would be to use a variable displacement pump.  In the event the pump is configured for minimal displacement, it provides a minimal volume of oil move, producing the hydraulic motor(s) to show a lot more slowly. Combine harvesters employed variable belt drives as early since the fifties. https://gearboxcvt69134.dgbloggers.com/33124271/the-single-best-strategy-to-use-for-gearbox-cvt