Why do most crane manufacturers reduce load capacity for duty-cycle operations?

Reducing load capacity for duty-cycle operations is primarily aimed at preventing side loading forces. In duty-cycle operations, cranes perform tasks such as lifting and lowering while moving materials horizontally, which can introduce different types of stresses on the crane's structure. These side loading forces can be detrimental, potentially leading to instability or even accidents if the crane is overloaded or operated beyond its recommended capacity.

By limiting the load capacity during these operations, manufacturers ensure that the crane remains stable and safe under dynamic conditions. This precaution helps to manage the additional forces that are exerted on the crane when it is in motion or when the load is not perfectly vertical, maintaining the overall integrity of the equipment and the safety of the personnel involved.