PMMI Fluid Power Practice Test 2025 - Free Fluid Power Practice Questions and Study Guide

Hydraulic locking refers to a condition where fluid becomes trapped within a hydraulic cylinder, preventing the movement of the cylinder or actuator. This situation typically occurs when a hydraulic system is unable to allow the fluid to escape from one side of a piston within the cylinder, effectively rendering it immobile. When the fluid is unable to move freely, the hydraulic system cannot function as intended, leading to a complete halt in movement.

This condition can arise due to various reasons, such as mechanical blockage, system design flaws, or malfunctioning components. Understanding hydraulic locking is important for anyone working with hydraulic systems, as it helps in diagnosing problems and ensuring that the system operates efficiently. Recognizing the signs of hydraulic locking and taking appropriate actions can prevent system inefficiencies or failures.

The other options do not accurately define hydraulic locking; they describe different hydraulic conditions or functions unrelated to the immobilization of movement caused by trapped fluid.