Hi and welcome to OCC! What you have is a HYDRO driven tractor. NOT to be confused with an automatic transmission with cruise control like in your car or truck. I've had over 10 different Hydro tractors and every one acted different. Let me ask you this, if you had a foot controled tractor, Would you mind if your foot wiggled a little to control your speed? I think not. I've always had to keep a hand on the speed control of any tractor I've owned and yes, when you do somthing to change fluid pressure in the drive it will change your speed. So will using a hydraulic lift or power angle snow plow while driving. Kind of like being in the shower up stairs in a two story house and somone down stairs flushes the toilet at the same time. Big change in water pressure! (I live in an 150 year old farm house with a well) You have to DRIVE your tractor! I haven't found one yet with AUTO-PILOT. I also think this is why all the new tractors went to the FOOT Controled system to free up your hand to use the cup holder! DRIVE your hydro! I like mine!!!
