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Danfoss hydraulic pumps are known for their reliable performance and efficiency in various applications. However, like any machinery, they can encounter issues, including low flow rates. Low flow problems can lead to inefficient operation and potential damage if not addressed promptly. In this article, we will explore common causes of low flow in Danfoss hydraulic pumps and provide steps to troubleshoot and resolve these issues.
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One of the first steps in troubleshooting low flow issues is to check the power supply to the pump. Ensure that the pump is receiving the correct voltage and current as specified in the manufacturer’s manual. Fluctuations or insufficient power can affect pump performance, resulting in lower than expected flow rates.

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Next, inspect the hydraulic fluid level and condition. Low fluid levels can cause cavitation, leading to reduced flow. Additionally, contaminated hydraulic fluid can cause internal wear and blockages, significantly affecting pump performance. Regular maintenance of hydraulic fluid, including filtration and replacement as necessary, is crucial for optimal pump operation.
Another potential cause of low flow is a restriction in the hydraulic system. Check for any blocked hoses, fittings, or filters that may be impeding fluid flow. A thorough examination of the hydraulic circuit can help identify any obstructions that need to be cleared. Also, examine any valves in the system to ensure they are in the correct position and functioning properly.
The pump’s internal components should also be inspected. Wear and tear on components such as gears, pistons, or seals can lead to inadequate flow. If there are signs of damage or excessive wear, it may be necessary to replace these components or even the entire pump, depending on the severity of the issue.
It’s also essential to consider the pump’s operational parameters. Check whether the pump is being operated within its designed range. Operating outside these parameters, such as exceeding maximum pressure ratings or flow limits, can lead to low flow issues and potential damage.