When inspecting hydraulic fluid levels, what else should be observed?

When inspecting hydraulic fluid levels, it is crucial to also check for the presence of leaks on the engine. Observing for leaks can indicate potential issues with the hydraulic system, such as damaged hoses or seals, which could lead to a loss of fluid pressure and ultimately affect the system's performance. Addressing leaks promptly ensures that the hydraulic system operates efficiently and reduces the risk of more severe damage or breakdowns.

While monitoring the color of the fluid, temperature, and replacement frequency are important aspects of overall hydraulic system maintenance, they do not directly lead to immediate identification of problems like the presence of leaks does. Knowing whether there are any leaks offers direct insight into the hydraulic system's integrity and reliability.