Backward stability of a crane is tested with which configuration?

The backward stability of a crane is primarily assessed to ensure it can safely support itself without tipping over when working in various configurations. Testing the crane with the basic boom at maximum angle and no load allows operators to observe how the crane behaves when it is in a position of maximum outreach without any additional weight that might alter the center of gravity.

In this configuration, the boom’s angle creates a scenario where the stability can be evaluated without the influence of load dynamics. By having the crane at maximum elevation, it is possible to identify any potential destabilizing issues related solely to the crane's design and stability characteristics, providing valuable information about its backward stability under a no-load condition.

The other configurations typically involve either loads or conditions that might complicate the assessment. For example, the other choices introduce additional factors, such as the weight of a load or the influence of ground slope, which can affect the crane's balance and make it harder to isolate the stability characteristics specific to the crane's design.