An operator is using a 15-tonne excavator to lift a 2,500 kg concrete barrier. The excavator's lift chart states a maximum capacity of 3,000 kg at 5 metres over the side and 2,200 kg at 6 metres over the side. The operator initially positions the machine to achieve a 5-metre load radius but then needs to extend the boom slightly to clear an obstruction, resulting in a 5.5-metre load radius. What is the safest action the operator should take?

Question: An operator is using a 15-tonne excavator to lift a 2,500 kg concrete barrier. The excavator's lift chart states a maximum capacity of 3,000 kg at 5 metres over the side and 2,200 kg at 6 metres over the side. The operator initially positions the machine to achieve a 5-metre load radius but then needs to extend the boom slightly to clear an obstruction, resulting in a 5.5-metre load radius. What is the safest action the operator should take?

Answer options:

• Proceed with the lift as the load is only slightly outside the 5-metre range. ✅ Reduce the load radius back to 5 metres or less before lifting.
• Assume an intermediate capacity between 3,000 kg and 2,200 kg and proceed.
• Increase engine RPM to compensate for the extended reach.

Correct answer: Reduce the load radius back to 5 metres or less before lifting.

Explanation: Increasing the load radius from 5 metres to 5.5 metres places the lift in a range where the excavator's capacity is lower than the 3,000 kg for a 5-metre radius. Since the 2,500 kg load is above the stated 2,200 kg for a 6-metre radius, the operator must reduce the load radius back to 5 metres or less to ensure the lift is within the machine's rated capacity and safe operating limits. Simply proceeding or interpolating could lead to instability or overload.