This step-by-step lawn mower repair guide explains how to replace a lawn mower blade. Check the lawn mower blade often during mowing season to make sure it's sharp and intact. Replace the blade with a manufacturer-approved lawn mower part if it's dull, damaged or bent. A dull blade tatters the tips of the grass blades rather than making a clean slice. A damaged or bent blade cuts unevenly and can make the mower vibrate excessively. Consider keeping a spare mower blade on hand, so you can install it right away to replace a dull or damaged blade.
Follow these steps to replace the cutting blade in Craftsman, MTD, Troybilt, Toro, Husqvarna, Murray, Snapper and Ariens walk-behind lawn mowers.