If there is erratic movement in the hydraulic system then possible cause/s is/are
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The erratic movement in the hydraulic system is due to aeration. This occurs when air contaminates the hydraulic fluid. Air makes an alarming banging or knocking noise when it compresses and decompresses in the hydraulic fluid as it circulates through the system. Foaming of the fluid and erratic actuator movement are other symptoms of aeration.
Usually air enters the hydraulic system through the pump's inlet. So it is important to make sure that the pump intake lines are in good condition and all the clamps and fittings are tight.
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The answer is aeration.
An erratic movement in the hydraulic system is possibly due to aeration. This causes an erratic movement in the actuator because of contamination of the hydraulic fluid by air that results in a knocking or banging noise when the hydraulic liquid flows through the system.
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