If operating on a grade with the hoe on the downward end, what should an operator do to stabilize the front wheels?

Filling the loader bucket with dirt or heavy material assists in stabilizing the front wheels when the hoe is positioned on a downward grade. This added weight lowers the center of gravity, which enhances balance and traction. When the loader bucket is filled, it acts as a counterbalance to the forces acting on the machine due to the slope, making it less likely to tip or slide down the grade.

The other options may not provide the same level of stability. For instance, reducing the bucket load or raising the loader bucket could decrease the machine's stability and increase the risk of tipping. Lowering the entire machine without adding weight may not adequately address the issue of maintaining stability on the slope. Thus, using a filled loader bucket is the most effective method for ensuring the front wheels remain stable while working on a downhill grade.