Why does mower deck make grinding noise?

A mower deck may make a grinding noise due to several reasons, including dull or damaged blades, which can cause them to scrape against the deck or other components. Additionally, debris buildup, such as grass or sticks, can interfere with the blades and create noise. Worn bearings or loose components in the deck can also contribute to grinding sounds. Regular maintenance, including blade sharpening and cleaning, can help prevent these issues.