Which precaution should always be taken before moving counterweights?

Before moving counterweights, engaging swing locks is crucial as it ensures the stability of the equipment being operated. Swing locks are designed to prevent the boom or other elements from unintentionally swinging during operations. This precaution not only safeguards the equipment but also ensures the safety of personnel working nearby by minimizing the risk of accidents caused by unintentional movement.

Other safety measures, such as verifying load charts, securing the work area, and checking operator experience, are important practices in the overall safety and effectiveness of crane operations, but they specifically do not address the immediate concern of stability during the movement of counterweights. Ensuring that the swing locks are engaged directly mitigates the immediate risks associated with moving counterweights, making it a priority in this context.