What is the minimum stability for a crawler crane?

• A. 70 percent
• B. 75 percent
• C. 80 percent
• D. 85 percent

Answer: (B)

Stability is about how close the crane can load and configuration get to the tipping point without losing balance. The minimum stability value sets the smallest safety margin considered acceptable for a crawler crane in normal work conditions. For crawler cranes, the commonly taught minimum stability is seventy-five percent. This means you plan and operate so that you stay within three-quarters of the crane’s rated capability for the given setup, leaving a margin to absorb factors like uneven ground, wind, dynamic lifting forces, and small measurement or setup errors. Going above this percentage would be a stricter limit, while dropping below it would compromise safety. So seventy-five percent is used as the standard minimum stability in basic crane practice.