FAQ

Tips On Hydraulic Pumps (1) : Cavitation

Cavitation

When hydraulic fluid flows through a system, an increase in flow velocity creates low-pressure zones. The gases dissolved in the hydraulic fluid then form bubbles, creating cavities. When these cavities travel into high-pressure zones, they are suddenly compressed, generating localized extreme pressure that strikes material surfaces, causing abnormal vibration and noise, and eroding the material. This phenomenon of cavity formation is known as cavitation. The severity of cavitation varies depending on the amount of gas dissolved in the hydraulic fluid, changes in fluid flow velocity, and fluid viscosity. When cavitation occurs in a pump, pump efficiency decreases, and output flow is reduced. The most effective ways to prevent cavitation are to increase the diameter of the inlet port to prevent air ingestion, reduce filter resistance, and improve the pump's suction capacity.

Hydraulic Pump Notes

Abnormal Phenomena and Possible Causes	Preventive Measures
Cavitation	Nearly 70% of hydraulic pump damage is caused by contamination, such as dirt or foreign particles entering the hydraulic system. Most problems can be prevented by removing contaminants and regularly cleaning or replacing the filters. Proper maintenance can help reduce repair costs and minimize downtime. If abnormal conditions occur, stop operation immediately and contact us for technical assistance.
Pipe diameter too small or clogged
Hydraulic fluid contaminated with excessive air or moisture
Fluid filter clogged with contaminants or with too fine a mesh rating
Excessively high oil viscosity may cause the pump to draw in air; excessively low oil viscosity may cause the pump to overheat
Improper fluid inlet position or insufficient fluid supply
Wear and Tear of Hydraulic Components Worn or damaged gears Worn shaft or bearing
Improper Installation Pump shaft misaligned with motor shaft Loose shaft coupling Loose bolts
Improper Design Pump components do not meet design specifications Motor, pump, and oil reservoir are improperly matched