Excavator Operator Certification Exam Prep · Question
An operator is lifting a 3,500 kg concrete barrier with an excavator. The lift chart indicates a maximum capacity of 4,000 kg at a 5-metre load radius and 3,000 kg at a 6-metre load radius. The operator has currently positioned the load at a 5.5-metre load radius. What action should the operator take?
At a 5.5-metre load radius, the capacity would be less than 4,000 kg but also less than 3,000 kg, likely falling below the 3,500 kg required. To ensure safety,
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Question: An operator is lifting a 3,500 kg concrete barrier with an excavator. The lift chart indicates a maximum capacity of 4,000 kg at a 5-metre load radius and 3,000 kg at a 6-metre load radius. The operator has currently positioned the load at a 5.5-metre load radius. What action should the operator take?
Answer options:
- Proceed with the lift as it is within the average capacity
- Extend the boom slightly to increase the load radius and distribute the weight better ✅ Retract the boom to bring the load closer, reducing the load radius to 5 metres or less
- Increase the engine RPM to provide more hydraulic power for the lift
Correct answer: Retract the boom to bring the load closer, reducing the load radius to 5 metres or less
Explanation: At a 5.5-metre load radius, the capacity would be less than 4,000 kg but also less than 3,000 kg, likely falling below the 3,500 kg required. To ensure safety, the operator must retract the boom to decrease the load radius to 5 metres or less, where the capacity is confirmed to be 4,000 kg or more. Increasing engine RPM does not increase the rated lift capacity.
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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