When plumbing a tower crane, which condition must be met?

When plumbing a tower crane, it is essential for the crane to be balanced. Balancing ensures that the load is evenly distributed and that the crane operates safely and effectively. When a crane is balanced, the center of gravity is aligned correctly, minimizing the risk of tipping or swaying, which can lead to unsafe working conditions and potential accidents.

This condition is crucial because cranes that are not properly balanced can experience excessive stress on their structural components and could potentially fail under load. Moreover, a balanced crane allows for precise movements and better control, which enhances the operator’s ability to place loads accurately and safely.

The other conditions mentioned do not inherently contribute to the effectiveness and safety of plumbing the crane. While stability and lowering or raising the crane may be necessary actions in various operational contexts, they are not directly tied to the specific requirement of balancing the crane for proper plumbing.