How to Sharpen the Blades on A Push Lawn Mower?

19 minutes read

Sharpening the blades on a push lawn mower is essential for maintaining a healthy lawn. Here's how it can be done:

  1. Preparation: Start by ensuring the lawn mower is turned off and disconnected from any power sources. Place the mower on a flat surface such as a workbench or table, with the blade facing upwards.
  2. Remove the blade: Using a wrench, loosen and remove the bolt or nut that secures the blade to the mower's deck. Carefully take out the blade and set it aside.
  3. Inspect the blade: Thoroughly inspect the blade for any cracks, bends, or excessive wear. If the blade is severely damaged, it might be necessary to replace it. Otherwise, if it is in good condition, proceed to the next step.
  4. Clean the blade: Remove any grass clippings, dirt, or debris from the blade using a wire brush or damp cloth. Make sure the blade is completely clean before proceeding.
  5. Secure the blade: To prevent the blade from rotating while sharpening, clamp it securely in a vise grip or use a blade-holding tool specifically designed for this purpose.
  6. Sharpen the blade: Using a metal file or grinder, start sharpening the blade. File along the original cutting edge of the blade, moving in the same direction as the edge. Maintain a consistent angle along the blade, typically around 45 degrees. File in smooth, even strokes until the entire blade edge is sharpened.
  7. Balance the blade: To ensure the blade is properly balanced, position it on a balancing tool or a sturdy dowel with the center hole. If one side is heavier, file a little more from that side until the blade is level.
  8. Reinstall the blade: Once the blade is sharpened and balanced, carefully place it back onto the mower's deck. Align the blade hole with the mower's spindle and reinstall the bolt or nut. Tighten it securely using a wrench.
  9. Test the mower: Before using the mower again, test its operation by starting it and allowing it to run briefly. Listen for any unusual noises or vibrations. If everything seems normal, the sharpening process is complete.

Regularly sharpened blades will help the lawn mower to cut grass cleanly and evenly, promoting a healthier lawn. It is recommended to sharpen the blades at least once a year, or more frequently if the mower is used extensively on rough terrain.

Best Push Lawn Mowers of 2024

YARDMAX 21 in. 170cc 2-in-1 Gas Walk Behind Push Lawn Mower with High Rear Wheels

Rating is 5 out of 5

YARDMAX 21 in. 170cc 2-in-1 Gas Walk Behind Push Lawn Mower with High Rear Wheels

  • Single-lever deck adjustment for quickly setting your mow height
  • MAXFlow Deck Technology – volute spiral deck design for better airflow and mulching
  • Heavy-duty, 16-gauge stamped steel deck
  • Durable, one-piece seamless steel deck reduces vibration
  • Seven cutting heights from 1.25″ to 3.75″
  • Double-ball-bearing wheels for easy, smooth mowing with less pushing effort
  • Adjustable, durable 3-position handle height
  • Folds for space-saving storage
  • 7 in. front and 11 in. rear wheels for stability and control
PowerSmart Gas Lawn Mower 21 Inch 2-in-1 with 144CC 4-Stroke Engine, Push Mower Gas Powered DB2321CR

Rating is 4.9 out of 5

PowerSmart Gas Lawn Mower 21 Inch 2-in-1 with 144CC 4-Stroke Engine, Push Mower Gas Powered DB2321CR

  • 144CC OHV ENGINE: reliable engine, recoil starter for easy start, forced air cooling system continuously deliver unbeatable grass cutting effect.
  • 21 INCH CUTTING DECK: patented cutting system with 21 inch cutting deck, wider mowing path helps you trim sizable yard fast.
  • 2-IN-1 PUSH MOWER: side-discharge easily pass thick grasses for quickest mowing, mulching lawn mower minces grass into super-fine bits for recycle.
  • GRASS HEIGHT ADJUSTABLE: 6 positions for adjust cutting height from 1.5" to 3.9", suitable for all kinds of grasses.
BILT HARD Gas Lawn Mower 20 inch, 2 in 1 170cc 4-Stroke OHV Engine Cordless Lawnmower, 8 Adjustable Cutting Heights Push Mowers for Lawn, Yard and Garden

Rating is 4.8 out of 5

BILT HARD Gas Lawn Mower 20 inch, 2 in 1 170cc 4-Stroke OHV Engine Cordless Lawnmower, 8 Adjustable Cutting Heights Push Mowers for Lawn, Yard and Garden

  • Auto Choke Engine - 170cc 4-stroke OHV engine, 6.5 torque, 20 inch cutting deck.
  • Cutting Height - 8-position single lever four-wheel synchronized height adjustment from 1.2" to 3.2".
  • Mowing Convenience - 7" rear/6“ front double ball-bearing wheels achieve smooth movement, comfortable foam-wrapped angled grip eliminates grasp fatigue.
  • Durable Cutting Deck: 20" cutting deck and specialized blade delivering a clean, even cut. Enjoy years of high efficient mowing with superior cutting quality
Greenworks 40V 16" Cordless (Push) Lawn Mower (75+ Compatible Tools), 4.0Ah Battery and Charger Included

Rating is 4.7 out of 5

Greenworks 40V 16" Cordless (Push) Lawn Mower (75+ Compatible Tools), 4.0Ah Battery and Charger Included

  • CORDLESS LAWN MOWER – Get more done, faster, with Greenworks electric lawn mowers. This 40v push lawn mower provides the power you need with up to 45 minutes of runtime on a fully charged 4.0Ah battery. The battery completely charges in 120 minutes.Brushless motor : No
  • LIGHTWEIGHT, EASY TO USE – A lightweight 16” cutting deck allows for easy maneuvering through small to medium yards (up to ½ acre) more efficiently. Easy push button start and lighter weight make it a great choice for your lawn.
  • VERSATILE – Battery powered lawn mower has a single lever 5-position height adjustment with a cutting height range from 1-1/4" to 3-3/8" for the best cut in all environments. The 2-in-1 feature offers versatile use with mulching and rear bagging options.
  • MAINTENANCE FREE – This walk behind lawn mower is virtually maintenance free, with no gas, no oil and no emissions. It starts instantly and is quiet but delivers gas-like power for your toughest projects.
Yard Machines 11A-02BT729 20-in Push Lawn Mower with 125cc Briggs & Stratton Gas Powered Engine, Black and Red

Rating is 4.6 out of 5

Yard Machines 11A-02BT729 20-in Push Lawn Mower with 125cc Briggs & Stratton Gas Powered Engine, Black and Red

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BLACK+DECKER Electric Lawn Mower, 10-Amp, Corded (BEMW472BH)

Rating is 4.5 out of 5

BLACK+DECKER Electric Lawn Mower, 10-Amp, Corded (BEMW472BH)

  • Lightweight corded electric mower gasless 10 Amp 15 inch electric mower for powering through rough grass.Ideal for 1/8 acre.Voltage : 120 V. Product Application : Cleaning.
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CRAFTSMAN Gas Powered Lawn Mower, 21-inch Push Mower, 140cc (M105)

Rating is 4.4 out of 5

CRAFTSMAN Gas Powered Lawn Mower, 21-inch Push Mower, 140cc (M105)

  • POWERFUL ENGINE: 140cc BRIGGS & STRATTON engine with auto-choke
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  • CLIPPING COLLECTION: Rear bag collects grass clippings for easy cleanup or composting
  • HEIGHT ADJUSTMENT: Dual-lever, 6-position height adjustment makes it easy to change cutting heights from 1.25 in. to 3.75 in. high
  • COMFORT: Adjustable loop handle for comfort while mowing. MULCH KIT: Included to help put nutrients back into soil for a healthy lawn
BLACK+DECKER 3-in-1 String Trimmer/Edger & Lawn Mower, 6.5-Amp, 12-Inch, Corded (MTE912) (Power cord not included), Black/Red

Rating is 4.3 out of 5

BLACK+DECKER 3-in-1 String Trimmer/Edger & Lawn Mower, 6.5-Amp, 12-Inch, Corded (MTE912) (Power cord not included), Black/Red

  • 3N1 DESIGN – Electric mower easily converts to string trimmer and edger via a built-in foot pedal for versatile use.
  • 6.5 AMP MOTOR – Supplies the ideal amount of power when trimming grass, weeds, and overgrowth.
  • GEAR DRIVE TRANSMISSION – For tackling tougher, thicker grass without getting bogged down.
  • AFS AUTOMATIC FEED SPOOL – Continuously feeds trimmer line without bumping for seamless, uninterrupted trimming.
  • ADJUSTABLE MOWER DECK AND TRIMMER HANDLE – Lawn mower deck and string trimmer handle are adjustable for ideal grass- cutting height and added comfort.
  • CORDED – Corded design offers unlimited runtime for even the biggest jobs.
  • INCLUDES – (1)GH912 trimmer/edger, (1) MTD100 detachable mower deck, (1) AF-100 spool, (1) auxiliary handle, (1) guard.
  • Note: Item requires power cord. Power cord not included

How to determine when it's time to replace lawn mower blades?

There are several signs that indicate it may be time to replace lawn mower blades:

  1. Dull or Damaged Blades: If the blades appear dull, rusty, bent, or have chips or nicks, it is a clear indication that the blades are no longer sharp enough to effectively cut grass.
  2. Uneven or Ragged Grass: If the lawn mower is leaving uneven or ragged cuts instead of a clean, even cut, it suggests that the blades are not cutting through the grass properly. This could be due to a blade that is no longer sharp or blades that are no longer properly aligned.
  3. Increased Effort in Mowing: If you find that you need to exert more effort or spend more time mowing the lawn than usual, it could be an indication that the blades are no longer sharp. Dull blades require more effort to cut grass, resulting in a slower and more labor-intensive mowing process.
  4. Excessive Vibrations: If the lawn mower starts to vibrate excessively while in use, it could be a sign that the blades are unbalanced or damaged. Unbalanced blades can cause excess stress on the mower and may lead to further damage if not addressed.
  5. Reduced Cutting Efficiency: If you notice that the grass is not being cut as cleanly as before, it's a sign that the blades are losing their effectiveness. This can result in a rougher-looking lawn and may lead to grass diseases or other lawn problems.

It's important to regularly inspect the condition of the blades to determine if they need to be replaced. Typically, lawn mower blades should be replaced every one to three years depending on usage and the quality of the blades.

How to store sharpened blades safely?

  1. Blade Storage Case: Purchase a dedicated blade storage case or container that is specifically designed to hold and protect sharp objects such as knives, razor blades, or other sharp blades. These cases are usually made of durable materials like plastic or metal and have individual slots or compartments to hold each blade securely.
  2. Sheath or Blade Cover: If your blade comes with a sheath or a protective cover, always use it to store the blade. The sheath or cover provides an extra layer of protection and prevents mishaps while handling or storing the blade. Make sure the sheath or cover completely encloses the sharp part of the blade.
  3. Blade Guard: If a dedicated storage case or sheath is not available, consider using a blade guard. Blade guards are plastic or silicone covers that can be easily fitted onto the blade, providing protection and reducing the risk of accidents while handling. They are typically available in various sizes and can fit most blade types.
  4. Magnetic Knife or Tool Strips: Install magnetic knife or tool strips on a wall or inside a cabinet. These strips have strong magnets that securely hold and display your blades without the need for additional sheaths or covers. Just make sure to position them out of reach from children or anyone who could accidentally come into contact with the blades.
  5. Blade Sharpener Storage Compartment: Some blade sharpeners come with a storage compartment or drawer specifically designed to house sharpened blades. If your sharpener has this feature, take advantage of it to safely store your blades.
  6. Dedicated Drawer or Container: If none of the above options are available, consider designating a specific drawer or container solely for storing sharpened blades. Make sure it is clearly labeled and kept out of reach and sight of children or anyone who might inadvertently come into contact with the blades.
  7. Wrap Blades: If you need to store blades temporarily or do not have access to any of the aforementioned storage options, wrap the blades in several layers of protective material such as bubble wrap, cloth, or foam. Tape the wrapping securely so that the sharp edge is completely covered and secured.

Remember, always exercise caution and prioritize safety when handling and storing sharp blades.

What is the benefit of maintaining sharp blades for lawn appearance?

Maintaining sharp blades for lawn appearance offers several benefits:

  1. Clean and even cut: Sharp blades provide a cleaner and neater cut, resulting in a more aesthetically pleasing lawn appearance. The grass is neatly sliced instead of getting torn or frayed, leading to a healthier-looking turf.
  2. Uniform grass height: Keeping blades sharp ensures that the grass is cut consistently at the desired height. This uniformity in grass length contributes to a visually appealing and well-manicured lawn.
  3. Faster healing and growth: Dull blades tend to tear the grass instead of cutting it cleanly. This can damage the grass blades and take longer to heal, resulting in a patchy and unhealthy lawn. On the other hand, sharp blades minimize trauma to the grass, promoting faster healing and regrowth.
  4. Reduced stress for the grass: Sharp blades require less force to cut through the grass, reducing stress on the plants. This can help prevent grass diseases and promote overall better lawn health.
  5. Increased fuel efficiency: When blades are sharp, the lawn mower operates more efficiently, requiring less power and fuel to cut the grass. This can lead to cost savings and reduced environmental impact.
  6. Enhanced mulching capabilities: If your lawn mower has a mulching feature, sharp blades are essential for effective mulching. Sharp blades finely chop the grass clippings, which can then decompose quickly and serve as a natural fertilizer for the lawn.
  7. Extended blade life: Routine blade maintenance, including sharpening, helps prolong the life of the blades. By preventing excessive wear and tear, you can avoid frequent blade replacements and save money in the long run.

Overall, maintaining sharp blades for lawn appearance results in a healthier, more attractive, and easier-to-maintain lawn.

What are the potential risks of using dull lawn mower blades?

Using dull lawn mower blades can pose several potential risks, including:

  1. Poor-quality cuts: Dull blades will tear the grass instead of cleanly cutting it, leading to uneven and ragged edges. This not only affects the appearance of the lawn but also weakens the grass, making it more susceptible to disease and pests.
  2. Increased mowing time: Dull blades require more effort to cut through the grass, resulting in slower mowing. This can be time-consuming and frustrating, especially for larger lawns.
  3. Stress on the mower's engine: The extra force required to mow with dull blades puts additional strain on the mower's engine. This can lead to overheating, decreased fuel efficiency, and potentially even engine damage.
  4. Increased fuel consumption: Dull blades require more power to cut through the grass, leading to higher fuel consumption. This can be especially noticeable in larger lawns or during extended mowing sessions.
  5. Reduced mulching capability: Dull blades are less effective in mulching grass clippings. Instead of finely chopping the clippings, they tend to leave larger clumps that may not decompose as quickly. This can hinder lawn health and contribute to thatch buildup.
  6. Increased disease and pest risk: When grass is torn rather than cleanly cut, it provides entry points for pathogens and pests. Dull blades can weaken the grass and make it more vulnerable to diseases such as brown patch or pests like grubs.
  7. Poor lawn appearance: Dull blades result in an overall untidy and unattractive lawn due to uneven cuts, straggly grass, and potential scalping in certain areas.

To avoid these risks, it is recommended to regularly sharpen or replace lawn mower blades according to manufacturer guidelines.

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