I don't know squat about hydraulics. My plow goes up and down, side to side no problem. But when done playing around, if I don't first lower the plow to the ground when shutting down to take the load off I will find that it has slowly lowered itself to the ground overnight. Probably some check valve failing which I really don't care about as long as the plow stays up when under power...which it seems to be doing, but I've only run this machine for a few minutes at a time as I shake her down.