Why should only approved attachments or extra counterweights made by the manufacturer be placed on the rear of the crane?

Only approved attachments or extra counterweights made by the manufacturer should be placed on the rear of the crane primarily because they are specifically designed to maintain the stability of the crane. Using non-approved attachments or weights can significantly alter the center of gravity, which may lead to a backward stability problem. If the center of gravity shifts too far to the rear, the crane can become unstable and tip over, leading to dangerous situations during operation.

Manufacturers conduct extensive testing and engineering analysis to determine the appropriate specifications for attachments and counterweights, ensuring the crane remains safe and effective under various load conditions. Adhering to these guidelines is crucial for the safe operation of cranes, as it helps prevent accidents and maintains compliance with industry safety standards.