Hi Guys, it's been awhile. Here is a quick tip on how to know when your mower blade needs to be sharpened. After you cut your grass, look at some of the cut blades of grass. If the tip is angled neatly, your blade is sharp. If there are tears or are ragged edges on the tip, it's time for sharpening. Dull blades can cause openings for fungus, and it can weaken your grasses resistance to disease. Keep your blade sharp to keep your grass healthy! Never A Dull Moment!