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Outdoor power equipment Four-signs-you-need-a-new-blade

Published on August 15th, 2014 | by Jeff Linderman


Four signs you need a new lawn mower blade

Your lawn mower blade may have taken a beating after a summer of mowing.

People often ask, “How do I know when I need to change my lawn mower blade?”

Here are four signs it’s time to replace your blade:

Safety first: Before inspecting your lawn mower blade or completing any maintenance work, be sure to first disconnect the spark plug boot that covers the spark plug. This will prevent the lawn mower from starting. Follow your lawn mower owner’s manual instructions for blade maintenance. When removing or installing a blade, place a thick, wood block in the undercarriage to prevent blade movement. Always wear protective work gloves when handling blades. An aged, dull blade is still dangerously sharp.


1. It’s more than two years old.

As a general rule of thumb, a mower blade should be replaced every one to two years for safety and performance purposes.


2. It’s bent.

It’s extremely common for blades to bend when you accidentally mow over rocks or other large objects. A bent, off-balance blade is a safety concern and may cause premature damage to the lawn mower such as destroying the bearings.


3. It’s dull and you’ve already sharpened it twice.

A sharp blade is essential to a healthy lawn. Dull blades tear grass, rather than cut, causing ragged tips and a widespread yellow hue over the lawn. If you’ve already sharpened the blade twice, it’s best to replace the blade. Repeated sharpening weakens blades, making them brittle and more susceptible to dangerous damage.


4. There are dents, gouges and/or pieces missing.

Deep dents, gouges and missing pieces are a major safety hazard. If there is any damage, it’s time to replace your blade. Pebbles and other small debris can be propelled at high speeds, which can cause fatal accidents. Damaged blades increase the risk of objects being propelled.

Other important safety reminders:

  • Always use the blades recommended by the lawn mower manufacturer for your particular model. This is important to safety and to the proper operation of the lawn mower. Blades marketed as a “universal” fit should be avoided.


Related info

Shop lawn mower blades
***Be sure to enter your lawn mower model number to find the blades recommended by the manufacturer for your particular model number.***

Lawn mower blade 101
How to make your lawn mower run like new
Lawn mower maintenance tips
Lawn mower repair help

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About RepairClinic

Since 1999, three and a half million people have purchased replacements parts and accessories from RepairClinic and saved more than $260 million in repair costs by fixing appliances, lawn equipment, power tools, and heating & cooling equipment on their own. From the beginning, RepairClinic has provided free troubleshooting and how-to resources on its website.

The company’s 2,000+ free how-to repair and how-it-works videos on its YouTube channel have been viewed more than 41 million times.

RepairClinic’s free, advanced online repair help system empowers do-it-yourselfers to fix common problems associated with home appliances, lawn equipment, power tools and heating & cooling equipment. DIYers can enter a model number to choose from a list of common symptoms for that particular model, troubleshoot and watch award-winning, expertly-produced videos to learn the most likely causes and conditions and purchase the correct part. stocks more than one million parts and accessories for 160 brands of lawn mowers, small engines, snowblowers, string trimmers, furnaces, air conditioners, air handlers, heat pumps, washing machines, dryers, dishwashers, vacuum cleaners, power tools and many other products.

Since 1999, the company has served more than three million customers including homeowners, first-time and beginner DIYers, advanced DIYers, appliance repair professionals, small engine repair shops and landscaping and lawn care business owners. RepairClinic orders are backed by a 365 Days. Period.® return policy that enables customers to return any part. Of the more than one million parts available on the website, 95 percent of parts ordered are in stock and guaranteed to ship the same business day. RepairClinic ships within the United States, U.S. territories and military bases and Canada.

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About the Author

Jeff Linderman is’s in-house outdoor power equipment and landscaping expert. For 25 years, Jeff owned and operated a successful commercial and residential landscaping business. He couldn’t afford the extensive downtime that came when he brought his equipment to be repaired at overloaded small engine repair shops. Instead, Jeff learned how to complete the repairs on his own. This interest in outdoor power equipment grew as Jeff completed extensive manufacturer training. Today, Jeff is a Briggs & Stratton® Master Service Technician, Kohler® Engines Expert Technician and a Kawasaki® Service Technician for Engines and Power Products. He has a B.A. in criminal justice from Michigan State University. Jeff worked for 25 years as a sergeant in the Wayne County Sheriff’s Department while he operated his landscaping business. He’s an avid fisherman and lives in the metro-Detroit area.

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