After putting a number of hours of use on your brush hog or brush mower, you’ll notice that the brush blade will need replacing. It will become dull, dinged up, and will not produce as clean a cut as it once did. A dull blade will also use more fuel and strain your engine much more than a sharp blade. Here’s how to replace the brush mower blade on your DR Field and Brush Mower. We offer both a Multi-Purpose Brush Blade and a Heavy-Duty Brush Blade for replacement.