Which of the following is essential when operating heavy machinery?

Conducting a pre-operation safety check is essential when operating heavy machinery because it ensures that all components and systems of the machinery are functioning correctly and safely before use. This check includes inspecting critical elements such as safety guards, fluid levels, and operational controls, helping to identify any potential issues that could lead to equipment failure or accidents. A thorough pre-operation safety check can significantly enhance the safety of the operator and anyone working nearby, minimizing the risks associated with heavy machinery operations. This practice not only promotes personal safety but also helps maintain the longevity and reliable performance of the equipment.