National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

Rough terrain crane capacities are generally greater over the front quadrant due to several design and operational factors. The structure and stability of rough terrain cranes are optimized to lift loads in that direction because it allows for better distribution of weight and stability as the crane's weight shifts during lifting.

The configuration of the crane, which often includes a heavier counterweight positioned toward the back, also supports greater lift capacities when operating over the front. This setup enhances the crane's overall balance and minimizes the risk of tipping while lifting loads.

In contrast, capacities over the rear and sides are generally lower due to the potential for loss of stability as the crane's center of gravity shifts outside its optimal balance point. Operating in these areas demands careful consideration of the crane’s limitations to ensure safety.