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Airlocks in hydraulic systems can be a significant issue, leading to reduced efficiency and even system failure. Sauer Danfoss hydraulic pumps, like other hydraulic components, can experience airlocks that disrupt fluid flow and operation. Troubleshooting these airlocks is crucial for maintaining optimal functionality. This article will guide you through the steps to identify and resolve airlocks in Sauer Danfoss hydraulic pumps.
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Understand the Symptoms

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The first step in troubleshooting airlocks is to recognize the symptoms. Common signs include:
Unresponsive steering or control mechanisms.
Spongy or soft operation of the hydraulic system.
Unusual noises, such as whining or grinding, during operation.
Inconsistent pressure readings on gauges.
Isolate the Problem Area
Once symptoms are detected, isolate the problem area. Determine if the airlock is localized within the pump or if it’s occurring in the hydraulic lines. To do this, observe system behavior when the pump is running under different conditions. If the pump is not delivering fluid, or if there is inconsistent operation, further investigation into the pump assembly may be necessary.
Check Fluid Levels and Quality
Airlocks can occur due to low fluid levels or degraded hydraulic fluid. Begin by checking the hydraulic fluid reservoir. Ensure that the fluid level is above the minimum threshold. Additionally, inspect the quality of the fluid. Contaminated or old hydraulic fluid may require replacement, as it can lead to cavitation and air entrapment.
Inspect for Leaks
Leakage in the system can introduce air into the hydraulic circuit, resulting in airlocks. Carefully inspect all hoses, connections, and seals for signs of deterioration or damage. Pay special attention to areas where fluid pooling or oily residue is observed. Replace any faulty components to prevent further air infiltration.
Bleed the System