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Hydraulic pumps are an essential component of many machinery and systems, providing the necessary hydraulic power for various applications. Sauer Danfoss hydraulic pumps are known for their durability and efficiency. However, there may be times when your hydraulic pump fails to start, causing downtime and frustration. In this article, we will explore common reasons why your Sauer Danfoss hydraulic pump may not be starting and how to resolve these issues effectively.
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One of the first things to check is the power supply. Ensure that the pump is receiving the proper voltage and that there are no tripped breakers or blown fuses. If the power supply is inadequate, your pump will not start. Use a multimeter to test the voltage at the pump’s power terminals. If there is no power, trace the electrical circuit back to the source to locate any issues.

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Another common problem is fluid contamination. Hydraulic fluid plays a critical role in the operation of the pump. If the fluid is contaminated with dirt, debris, or moisture, it can impair the pump’s performance or prevent it from starting altogether. Inspect the hydraulic fluid and replace it if necessary. Additionally, check the filters and strainers for blockages and clean or replace them if they are dirty.
A lack of hydraulic fluid can also be a reason for the pump not starting. Check the fluid levels in the reservoir and ensure that they are adequate. If the reservoir is low, fill it with the appropriate hydraulic fluid and try starting the pump again.
Mechanical issues could also be the culprit behind your pump’s failure to start. Inspect the pump for any obvious signs of wear or damage. Listen for any unusual sounds when attempting to start the pump, such as grinding or knocking noises, which may indicate internal damage. In such cases, it may be necessary to disassemble the pump to check for damaged components or defects.