What is a common cause of hydraulic fluid contamination?

Moisture entering the system is a common cause of hydraulic fluid contamination because water can negatively affect the performance and longevity of hydraulic fluids. When moisture enters the hydraulic system—whether through condensation, leaks, or improper sealing—it can lead to the formation of emulsions, which can reduce the lubricating properties of the fluid. Additionally, water can promote corrosion of metal components and encourage the growth of bacteria or fungus, further degrading the system’s components and performance.

In contrast, the use of synthetic fluid, regular fluid replacement, and proper handling of components are generally practices that reduce the risk of contamination or maintain fluid quality. Synthetic fluids are often formulated to be more resistant to contamination and degradation, regular replacement helps to remove old, contaminated fluid, and proper handling minimizes exposure to contaminants. Thus, while those practices contribute to a healthier hydraulic system, moisture ingress remains a significant risk factor for contamination.