What is the primary reason you should never check a hydraulic line under pressure with your hand?

The reason to never check a hydraulic line under pressure with your hand is that pressurized fluid can penetrate your skin. This is a critical safety concern because hydraulic fluids are often under extremely high pressure, and even a small amount of fluid can cause serious injury. If the fluid penetrates the skin, it can lead to a condition known as "hydraulic injection," which can result in significant tissue damage and potentially require medical intervention. This emphasizes the importance of using appropriate tools and safety practices when working with pressurized systems to ensure that linemen remain safe while performing their duties.

Understanding the hazards associated with hydraulic lines is essential for maintaining safety on the job. Protecting oneself from injury should always be a top priority, particularly in environments where high-pressure systems are in use.