For load rating to apply, what must be true about the ground?

• A. Level and firm
• B. Soft and wet
• C. Damp
• D. Sloped

Answer: (A)

Load ratings assume the crane sits on a surface that can carry the weight without shifting. The ground has to be level so all outriggers contact evenly and the load is distributed symmetrically, and it must be firm so it won’t compress or shift under the crane’s weight. If the ground is soft and wet or damp, or if it’s sloped, it can deform or cause one side to bear more load, which changes the stability and makes the published load rating unreliable. In those cases you can’t rely on the load rating until you level and firm the ground (often with mats or cribbing) and re-check the lift conditions.