What is one factor that can decrease the lifting capacity of a crane?

Increasing the lift height is a significant factor that can decrease the lifting capacity of a crane because as the boom extends to raise the load higher, the crane becomes less stable and its ability to support weight diminishes. This is due to the mechanics of the crane's design, which relies on a balance of forces and leverage. As the lifting point moves up, the center of gravity can shift, thereby reducing the overall capacity. Moreover, the increased height can expose the crane to additional dynamic forces such as wind, further impacting stability and lifting capabilities.

In contrast, using a secondary lifting device, reducing the load weight, and optimizing load distribution can generally enhance safety and efficiency. A secondary lifting device often helps in the secure handling of loads, reducing strain on the crane's capacity. Reducing load weight directly increases the crane's lifting capacity, and optimizing load distribution ensures that the weight is balanced, enhancing stability.