Thats the sign of a weak pump but it usually takes awhile to slowly wear down. Air leaking past the pump shaft seal. May take a speedy sleeve to fix. A lot of times it the seal that goes from the pump to the transission allows air in. Many people run an extra 5 gal. of oil in the tranny to cover the seal. I have to and it doesn't hurt your tractor. Most likely something gumming up and blocking a valve or a popoff maybe has something stuck under the ball.
The settling down could be leaking pistons inside the cylinders maybe the valve spools sticking and not centering like they should. Does the steering work ok? Sometimes it is just a process of elimination and checking pressures and flows. Try some things and let us know. Someone with knowledge will come along and trump my post. good luck.I would rule out everything else before buying a new pump.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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