Which of the following could indicate a need for replacement of hydraulic fluid?

Discoloration or the presence of particulates in hydraulic fluid is a clear indication that the fluid may no longer be effective and could require replacement. Hydraulic fluids are designed to maintain specific properties, such as viscosity and clarity, which ensure efficient operation of hydraulic systems. When fluid becomes discolored, it may suggest contamination or degradation, which could lead to inadequate lubrication or cooling within the system. The presence of particulates can further exacerbate this issue, leading to wear and potential failure of hydraulic components. Therefore, monitoring fluid condition and ensuring it remains clear and free from contaminating particles are critical for the longevity and performance of hydraulic systems.