I have a Farmall Super A. Last night I was discussing a project with my father-in-law. I started up the tractor and moved the hydraulic control levers and one arm slowly went to about 1/2 travel and then nothing much else happened. He thought it was probably due to the type fluid used and the temperature, which was around zero degrees fahrenheit. Not sure what kind of fluid is in it. Feasible? If the fluid is "too thick" to flow at low temps, could it damage any parts by moving the levers and trying to make things move?