On December 2, 2016, a technical representative for a shield manufacturer, with 13 years of experience, received fatal injuries while adding components to the hydraulic system of a longwall shield. The victim was positioned inside the shield near the hinge point when the shield collapsed and crushed him.
- Ensure that miners who install, remove, or maintain shields are trained on proper procedures.
- Never remove hydraulic components without first determining if they are pressurized and/or supporting weight. Ensure all stored energy is released or controlled before initiating repairs.
- Never work on hydraulic components of both supporting cylinders of longwall shields simultaneously. A shield can collapse if hydraulic components from both cylinders are removed, even if both cylinders have functioning pilot valves.
- Never work on a component that supports a raised portion of the shield unless the shield is blocked against motion.
- Be aware of potential pinch points when working on or near hydraulic components. Examine work areas for hazards that may be created as a result of the work being performed.
- Maintain good communication with co-workers. Make sure those around you know your intentions.
Click here for: MSHA Preliminary Report (pdf)