What is the center of gravity (CG) and why is it critical for lifting?

• A. CG is the point where the load's weight is concentrated; incorrect CG can cause tipping and unstable lifts; determine CG before lifting.
• B. CG is the location on the crane where fuel is stored.
• C. CG is the operator's favorite color.
• D. CG is the color of the load.

Answer: (A)

The center of gravity is the point where the load’s weight is concentrated, the balance point around which the weight is evenly distributed. It’s critical for lifting because the crane must lift through this point; if the center of gravity isn’t aligned with the crane’s hook or moves during the lift due to uneven rigging, the load can become unstable, tip, or swing, increasing the risk of equipment failure or an accident. Knowing where the CG lies before lifting lets you plan the rigging and attachment points so the load remains balanced, and it ensures you use the crane’s capacity accurately for that lift. As rigging changes or loads are attached, the CG can shift, so it should be re-checked to maintain stability. Irrelevant details like the fuel storage location, the operator’s favorite color, or the load’s color don’t affect lifting stability.