An excavator operator is tasked with hoisting a 2,500 kg concrete pipe. The lift chart shows a rated capacity of 2,800 kg at the required 5-metre load radius when operating over the front. However, when the operator positions the excavator, the load radius increases by 0.5 metres due to uneven terrain. What is the most immediate safety concern?

Question: An excavator operator is tasked with hoisting a 2,500 kg concrete pipe. The lift chart shows a rated capacity of 2,800 kg at the required 5-metre load radius when operating over the front. However, when the operator positions the excavator, the load radius increases by 0.5 metres due to uneven terrain. What is the most immediate safety concern?

Answer options:

• The increased load radius will reduce the maximum allowable slewing speed.
• The excavator's hydraulic system may overheat due to the extended reach. ✅ The actual lifting capacity at 5.5 metres radius might be below the 2,500 kg load.
• The counterweight will become less effective, causing excessive track wear.

Correct answer: The actual lifting capacity at 5.5 metres radius might be below the 2,500 kg load.

Explanation: An increase in load radius, even a small one, significantly decreases the excavator's lifting capacity. An unexpected increase from 5 metres to 5.5 metres could mean the actual safe lifting capacity at the new radius falls below the 2,500 kg load, leading to instability or tipping. The operator must re-evaluate the lift chart for the new radius or reposition the excavator to achieve the safe load radius.