This is a common problem for tractors where it has been many years since they were split between the center section and the rear frame. there is an O-ring seal between those two housings to connect the suction side of the MCV pump. As the o-rings ages it becomes less effective at sealing between the two housings. Since the seal is above the oil level air enters on the suction side of the pump. When you start the tractor this air is drawn into the MCV pump which is not very good at pumping air.
The short term solution is to add about five to seven gallons of oil above the full mark on the stick. That puts the oil level above the seal so air will no longer enter the MCV pump. The only downside is that when you change hydraulic filters you will also drain out some of this extra oil.
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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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