What factor does NOT affect hydraulic system efficiency?

When evaluating the efficiency of a hydraulic system, several factors play critical roles in its performance and effectiveness. Among these, ambient temperature is generally considered not to directly affect hydraulic system efficiency in the same way that other factors do.

Fluid cleanliness is crucial because contaminants can lead to increased friction and wear on components, reducing the system's efficiency. Similarly, pump design influences how effectively the hydraulic system converts mechanical energy into hydraulic energy, impacting overall efficiency. Pipe diameter is also significant, as it can affect flow resistance and pressure drop within the system, which are key factors in determining how efficiently the hydraulic fluid is delivered to the actuators or other components.

In contrast, while ambient temperature can influence the viscosity of the hydraulic fluid and therefore its flow characteristics, it is not typically a direct factor in the overall efficiency of the system, assuming the fluid is within operational temperature ranges and appropriate fluids are used. Thus, ambient temperature is not a primary concern compared to the mechanical and structural factors that critically influence hydraulic system efficiency.