Most load chart ratings require the crane to be_________.

Most load chart ratings require the crane to be_________.

• A. Properly Level
• B. On sloped ground
• C. On soft ground
• D. With outriggers retracted

Answer: (A)

Load charts are based on a stable, level setup. When the crane is on a firm, level surface with the stabilizers or outriggers properly deployed, the forces from the load and the crane itself act as the chart assumes, so the rated capacity is valid. If the crane sits on sloped ground or soft ground, or if the outriggers are not used (retracted), the base becomes unstable and the center of gravity shifts, which can drastically reduce safe lifting capacity and increase the risk of tipping. That stability condition is why the ratings assume the crane is properly level.

Load charts are based on a stable, level setup. When the crane is on a firm, level surface with the stabilizers or outriggers properly deployed, the forces from the load and the crane itself act as the chart assumes, so the rated capacity is valid. If the crane sits on sloped ground or soft ground, or if the outriggers are not used (retracted), the base becomes unstable and the center of gravity shifts, which can drastically reduce safe lifting capacity and increase the risk of tipping. That stability condition is why the ratings assume the crane is properly level.