A novice excavator operator is loading a convoy of articulated dump trucks (ADTs) from a large stockpile of aggregate. The operator is struggling to meet the required loading rate, frequently missing the truck box and spilling material. Which action would most significantly improve the operator's efficiency and reduce spillage in this scenario?

Question: A novice excavator operator is loading a convoy of articulated dump trucks (ADTs) from a large stockpile of aggregate. The operator is struggling to meet the required loading rate, frequently missing the truck box and spilling material. Which action would most significantly improve the operator's efficiency and reduce spillage in this scenario?

Answer options:

• Increasing the engine RPM to speed up hydraulic functions.
• Requiring the trucks to reverse into a tighter arc. ✅ Adjusting the swing speed control to a lower setting.
• Using a larger capacity bucket for each load.

Correct answer: Adjusting the swing speed control to a lower setting.

Explanation: Adjusting the swing speed control to a lower setting will provide the operator with finer control over the excavator's rotation, reducing overshoot and improving the accuracy of bucket placement into the truck box. While a larger bucket could increase volume per cycle, without improved control, spillage might worsen. Increasing engine RPM without addressing control issues won't solve accuracy problems.