An additional method should be to employ a variable displacement pump.  Once the pump is configured for low displacement, it produces a minimal quantity of oil flow, causing the hydraulic motor(s) to turn a lot more slowly but surely. A Continuously Variable Transmission (CVT) is a kind of automatic transmission https://mylesdntut.blogsvirals.com/33290529/helping-the-others-realize-the-advantages-of-gearbox-cvt