Which of the following can indicate the need for inspecting a hydraulic system?

Indications of the need for inspecting a hydraulic system are critical for maintaining performance and preventing failures. The presence of air bubbles in the fluid is a significant red flag because air in hydraulic fluid can lead to cavitation, reduced power transmission, and inefficient system operation. Air bubbles compromise the effectiveness of the hydraulic fluid, which is vital for transferring force and energy within the system. This can ultimately result in system malfunctions or damage if not addressed promptly.

In contrast, consistent power output, stable temperature readings, and no visible leaks generally suggest that a hydraulic system is functioning normally. These conditions indicate that the system is likely operating efficiently without immediate concerns. Therefore, the presence of air bubbles stands out as a clear sign that inspection and possible maintenance are needed to ensure the system remains reliable and effective.