When should the trial lift of a crane be repeated?

The necessity to repeat a trial lift of a crane when moving to a new location or after repairs is critical for several reasons. Each job site can present unique challenges and hazards that might affect how the crane operates. For instance, the ground conditions, overhead obstructions, and the weight of the load can vary significantly between locations. By performing a trial lift, the operator can ensure that the crane can handle the specified load safely in its current environment, confirming stability and the effectiveness of all safety mechanisms.

After repairs, it is equally important to conduct a trial lift. Even minor repairs can impact the crane's performance and safety features. A trial lift serves as a testing procedure to verify that everything is functioning correctly and to identify any potential issues before actual lifting begins. It is a proactive measure to ensure the safety of the operators and those working around the crane.

While conducting a trial lift before every shift change, weekly, or only during the initial setup all have contexts that may require attention, they do not address the immediate need for verification of crane operation after significant changes such as relocation or repairs. Thus, the correct approach is to repeat the trial lift in those specific situations to ensure the ongoing safety and reliability of the crane.