Know what direction a spring will move and how it might affect another machine part when released, and stay out of its path. Hydraulic Systems Hydraulic systems store considerable energy. They lift implements, such as plows, change the position of implement components, such as a combine header or bulldozer blade, operate hydraulic motors and assist in steering and braking. Careless servicing, adjustment or replacement of parts can result in serious injury. High-pressure blasts of hydraulic oil can injure eyes or other body parts by burning or penetrating the tissue.
Leaks are a serious hazard.
Never inspect hydraulic hoses with your hands because a fine jet of hydraulic fluid can pierce the skin. Get medical attention quickly, or you could lose that part of the body that was injected. Use a piece of cardboard to test the hose for leaks. Follow the instructor's manual when servicing hydraulic systems. Make certain the hydraulic pump is turned off.