A loader operator is assigned to fine grading a sub-base for a new parking lot using a wheel loader. The grade stakes indicate a finish grade of +150 mm and the current ground level is +250 mm. Which action should the operator take to achieve the desired grade?

Question: A loader operator is assigned to fine grading a sub-base for a new parking lot using a wheel loader. The grade stakes indicate a finish grade of +150 mm and the current ground level is +250 mm. Which action should the operator take to achieve the desired grade?

Answer options: ✅ Lower the front of the bucket by 100 mm from the current ground level and begin grading.

• Raise the front of the bucket by 100 mm from the current ground level and begin grading.
• Lower the front of the bucket by 250 mm from the current ground level and begin grading.
• Maintain the bucket at the current ground level and add material.

Correct answer: Lower the front of the bucket by 100 mm from the current ground level and begin grading.

Explanation: To achieve a finish grade of +150 mm from a current level of +250 mm, the operator needs to remove 100 mm of material. Therefore, the bucket should be lowered by 100 mm from the current ground level. Raising the bucket would add material, and lowering it by 250 mm would over-excavate.