A crane manufacturer's load chart is based on a level, firm supporting surface and maximum outrigger extension. If a crane is set up with outriggers extended to 75% of their full length, which statement regarding the load chart capacity is correct?

Question: A crane manufacturer's load chart is based on a level, firm supporting surface and maximum outrigger extension. If a crane is set up with outriggers extended to 75% of their full length, which statement regarding the load chart capacity is correct?

Answer options: ✅ The crane's actual lifting capacity will be reduced and a derating chart or calculation must be used.

• The crane's capacity remains the same as indicated on the fully extended outrigger chart.
• The crane's capacity increases due to a smaller footprint, making it more stable.
• The crane can lift loads up to 125% of the chart capacity for that radius.

Correct answer: The crane's actual lifting capacity will be reduced and a derating chart or calculation must be used.

Explanation: Operating with outriggers at less than full extension requires consulting a specific load chart for reduced outrigger extension or applying a derating factor, as the crane's stability and structural integrity are compromised. CSA Z150 mandates that capacities are based on maximum outrigger spread unless otherwise specified.