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Hydraulic pump cavitation can be a significant issue in low-flow applications, leading to inefficiencies, damage, and reduced operational lifetimes of hydraulic systems. Understanding how to identify and troubleshoot this phenomenon is essential for maintaining optimal performance. Below are steps to help diagnose and resolve cavitation problems in your hydraulic system.
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Understanding Cavitation

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Cavitation occurs when the pressure within the hydraulic pump falls below the vapor pressure of the hydraulic fluid, leading to the formation of vapor bubbles. These bubbles can collapse violently as they enter higher-pressure areas, causing noise, vibration, and wear on pump components. In low-flow applications, cavitation is particularly likely due to insufficient fluid movement and pressure drops.
Signs of Cavitation
Before diving into troubleshooting, it’s important to recognize common signs of cavitation:
Unusual Noise: Listen for loud, rumbling, or grinding noises from the pump, which can indicate bubble collapse.
Vibration: Excessive vibration can be a sign of cavitation affecting pump stability.
Decreased Performance: A drop in pressure and flow rate can suggest that cavitation is affecting the system’s efficiency.
Visible Damage: Inspect the pump for pitting or erosion on the impeller blades and casing.
Troubleshooting Steps