What does a decrease in mechanical efficiency indicate?

A decrease in mechanical efficiency indicates an increase in internal friction within the system. Mechanical efficiency is a measure of how effectively a machine converts input energy into useful work output. When internal friction increases, it represents a loss of energy as heat rather than utilizing it for performing work. This could be due to factors such as wear and tear on components, improper lubrication, or misalignment of parts, all of which contribute to energy being wasted internally instead of being converted to useful work.

In systems where mechanical efficiency is declining, it is important to address the underlying issues causing the internal friction. This can involve maintenance actions such as lubrication, replacements, or adjustments to ensure that the system operates more efficiently and effectively. Understanding this relationship is critical for diagnosing performance issues in hydraulic pumps and actuators.