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

Crane manufacturers reduce load capacity for duty-cycle operations primarily because side loading forces may occur. In these operations, the crane is often subject to dynamic loads and lateral forces that can be significantly different from the static loads considered in standard capacity calculations. This is particularly relevant during tasks such as piling or clamshell operations, where the crane may not be lifting vertically and can experience side loads that could compromise stability and safety.

By reducing the load capacity, manufacturers provide a margin of safety to ensure that the crane can operate without exceeding the limits that could lead to tip-over or structural failure. This precaution helps maintain safe operating conditions during complex and varied maneuvers inherent in duty-cycle operations. The focus on mitigating risks associated with side loading is crucial to ensuring the safe performance and longevity of crane equipment in a range of applications.