hydraulic cylinders

Is there a way to actually bleed the air from a hydraulic system which uses
cylinders? If not does the trapped air in the cylinder just get compressed
to the working pressure and add a cushion effect?
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there are several methods for removing air in the commissioning of a system, depending on its use and other requirements, I have vacuumed to 25 inches several times on certain cylinders used in elevators, but for the most part the entrained air is eventually cycled back to tank , just depends on the nature of the equipment
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I had this problem when I set up my hydraulic press.
Just topped up the tank and ran the thing back and forth a few times.
Then it was fine.
I would assume that the compressed air "dissolves" in the oil and once it gets back to the tank, it just kind of bubbles off.
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