An operator is finishing a road with a 2% crown. The road is 8 metres wide. During the final pass, they notice the centre is slightly low. To correct this, which mouldboard adjustment would be most effective for pushing more material towards the centre?

Question: An operator is finishing a road with a 2% crown. The road is 8 metres wide. During the final pass, they notice the centre is slightly low. To correct this, which mouldboard adjustment would be most effective for pushing more material towards the centre?

Answer options: ✅ Increase the mouldboard heel, and slightly decrease the angle to the direction of travel (make it more acute).

• Increase the mouldboard toe, and slightly increase the angle to the direction of travel (make it more obtuse).
• Decrease the mouldboard heel, and maintain the current angle.
• Tilt the mouldboard forward (increase pitch) and decrease travel speed.

Correct answer: Increase the mouldboard heel, and slightly decrease the angle to the direction of travel (make it more acute).

Explanation: To push more material towards the centre and effectively build up a low crown, increasing the mouldboard heel (lifting the back of the blade) and slightly decreasing the angle to the direction of travel (making it more acute, e.g., from 60 to 50 degrees) helps to 'roll' the material inwards. This action gathers and directs more material under the blade, consolidating it at the required centreline, as per advanced grader techniques.