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Hydraulic systems are essential in various industrial applications, especially in closed-loop systems where precision and reliability are paramount. However, when issues arise with hydraulic pumps, they can lead to decreased efficiency, increased operational costs, and even damage to the equipment. Understanding how to troubleshoot problems effectively can save time and resources. This article outlines common hydraulic pump problems in closed-loop systems and how to diagnose and resolve them.
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Start by observing symptoms. If you notice a drop in performance, such as sluggish operation or jerky movements, it may indicate pump-related issues. Begin by checking the fluid levels. Low hydraulic fluid can lead to inadequate lubrication and cooling, causing the pump to run inefficiently.

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Next, inspect the fluid for contamination. Contaminated fluid can cause pump wear and failure. Look for signs of dirt, debris, or water in the hydraulic fluid. If contamination is present, the system should be flushed, and a new filter should be installed.
Another critical factor is pressure. Use a pressure gauge to measure the system’s pressure during operation. If the pressure is too low, it may suggest pump wear or a malfunctioning relief valve. Conversely, excessively high pressure can stress the system components, indicating the need for further inspection.
Noise is another indicator of pump issues. Listen for unusual sounds such as grinding, whining, or banging, which can indicate cavitation or internal damage. Cavitation occurs when vapor bubbles form in the fluid due to low pressure and then collapse, causing shock waves that damage the pump. If cavitation is suspected, check for blockages in the inlet line, ensure proper fluid levels, and confirm that the pump is positioned correctly.