What is the primary function of a hydraulic motor?

A hydraulic motor's primary function is to convert hydraulic energy back into mechanical work. This process is essential in various applications where rotary motion is required. When hydraulic fluid under pressure is sent into the motor, it exerts force on the motor's vanes or pistons, causing them to rotate. This rotation can then be harnessed to perform work, driving machinery or providing movement.

Understanding this conversion process highlights why the other options do not correctly describe the primary function of a hydraulic motor. For example, while converting mechanical work into hydraulic energy is a function of hydraulic pumps, it does not pertain to motors. Similarly, providing feedback is more related to control systems that monitor performance rather than the function of a motor itself. Lastly, filtering hydraulic fluids addresses a different aspect of hydraulic system maintenance, which is unrelated to the motor's operation. Therefore, the correct understanding of a hydraulic motor centers on its ability to transform hydraulic energy into useful work through rotational motion.