When swinging a heavy load on outriggers, what must the outrigger being swung over support?

When swinging a heavy load on outriggers, the outrigger being swung over is required to support 85% of the weight of the crane, in addition to 100% of the weight of the load being lifted. This requirement is crucial for maintaining stability and preventing tipping during operations.

The reason for this specification is rooted in the dynamics of lifting and the gravitational forces involved. As the load is swung, the crane experiences additional forces that can shift its center of gravity. The majority of the crane's weight must be supported by the outriggers to ensure that the crane remains stable and secure while the load is in motion.

This balance helps to distribute the forces effectively across the outriggers and minimizes the risk of overload on any one outrigger, which could lead to a collapse or instability during operation. Consequently, understanding and adhering to this requirement supports safe operational practices when using mobile cranes in various lifting scenarios.