Besides all the other info you got I have found that load sensing systems on newer tractors can be deadly on hydraulic motors if not set up right. If you have the flow setting to high it will pump oil at a continuous 2900 PSI and most motors can't take that. I set my hydraulic pump up with an inline pressure guage on both the pressure line and the return line so I can monitor the hydraulic pressure. Make sure I never go over 2000 on the pressure side and try to say under 100 on the return hose.   One notch on the oil flow can make a differenc and even if you get you setting just right if you turn the pump on with cold oil it can pump at too high a pressure.