In the event of a loss of hydraulic power, what action should be taken to ensure worker safety?

The correct action to take in the event of a loss of hydraulic power is to have someone manipulate the holding valves. In hydraulic systems, holding valves are crucial as they maintain pressure and keep machinery in a safe position, preventing unintended movement that could endanger workers. When hydraulic power is lost, simply manipulating these valves can help stabilize the equipment, ensuring that it remains in a safe state until proper repairs can be made. This action minimizes the risk of accidents or injuries that could occur from sudden drops or movements of heavy machinery.

While activating emergency brakes or turning off all power sources might seem like reasonable responses, they may not address the specific stability concerns associated with hydraulic systems. Similarly, evacuating the area could be necessary in certain high-risk scenarios, but it doesn't directly mitigate the immediate hazards related to the equipment's operation. Therefore, manipulating the holding valves is the most effective method to maintain safety until the situation can be properly resolved.