Drift in mobile cranes can be caused by what type of actions?

Drift in mobile cranes primarily occurs due to swinging or extending the boom rapidly. When the boom is swung or extended quickly, it can cause the crane to move unpredictably due to the shift in momentum and the dynamics of the load. Rapid movements can introduce inertia that results in the load drifting away from the expected path. This has the potential to disturb the stability of the crane and create unsafe conditions, as unexpected movements can lead to loss of control over the load.

The other options, while they might influence crane operations in various ways, do not directly lead to drift in the same manner. For instance, swaying the load may cause some instability, but it is the rapid actions related to the boom that more directly affect drift. Working under sloping surfaces can create challenges, but it does not inherently result in drift unless coupled with rapid movements. Operating over load limits can cause structural failure or tipping, but it doesn’t account for the specific motion-induced drift that occurs from the rapid swinging or extension of the boom.