I would disconnect the remote hydraulic return line and route it to a clean bucket so you know that you have an unobstructed return flow. Operate some your troublesome remote functions and see if the squeal remains.
Air gets into your hydraulic system through leaks in your suction connections (suction line seals, and possibly pinhole leaks/cracks in the suction line). Leaking hydraulic filter seal is also possible. The root cause is probably due to a plugged pump suction screen in the reservoir. Do you see aerated hydraulic fluid?
The vent is necessary to expel air from the reservoir and is not part of the problem.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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