What is a common sign of hydraulic fluid contamination?

The presence of white sludge in the reservoir is a common sign of hydraulic fluid contamination. This phenomenon indicates that moisture has entered the hydraulic system, leading to the formation of emulsified oils and water, which create a milky or white appearance. Water in hydraulic fluid can degrade the performance of the fluid, cause corrosion within the system, and lead to component failure over time.

The other indications, while they may suggest issues within a hydraulic system, do not specifically signal contamination. High temperature readings could indicate excessive friction, inadequate lubrication, or other operational issues, but not necessarily contamination. Low pressure readings may suggest leaks or blockages but aren't definitive of fluid contamination. Excessive noise from the pump can suggest mechanical issues or inadequate lubrication, but again, it does not specifically point to contamination of the fluid itself.