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How to Replace Lawn Mower Blade?

URSROBOT Inc is a leading company specializing in service robot solutions, dedicated to bringing outdoor service robots into various aspects of daily life.

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Simple Maintenance NEXMOW Robotic Mower

Even with the right mowing tools, neglecting regular blade maintenance can lead to poor mowing performance. This not only prevents a neat and attractive lawn but can also injure grass blades, causing slow growth or yellowing, and increase the risk of accidents. This article offers a clear guide on how to properly change lawn mower blades, including the right timing and frequency!

First Thing: Check if the Blade Needs to be Replaced

The frequency of blade replacement varies based on your mowing tools, the type of grass, and the season. If you mow frequently or deal with taller, thicker grass, complex terrain, or unstable weather conditions, the blades will wear out faster and require more frequent replacement.

Blade Dullness

To initially determine if the blades need replacement, assess mowing performance, blade wear, and machine operation:

  1. Blade Damage
    Look for rust, significant wear on the edges or surfaces, cracks, or bends in the blades.
  2. Missed Grass
    If the lawn has areas where grass remains uncut, it indicates the blades are not performing well.
  3. Noise and Vibration
     Unusual noise or vibrations during operation suggest that the blades may need replacing.
  4. Recommended Replacement Time
    Follow the manufacturer’s suggested replacement intervals and keep a record of when blades were last changed.
  5. Increased Mowing Time
    If mowing takes longer than usual, it could be due to dull blades requiring more effort to cut grass.

Types of Cutting Tools

Different lawn mowers use various cutting tools and methods. It is important to recognize these differences when considering blade replacement:

  1. Rotary Mower
    Typically equipped with horizontally spinning blades, using heavy, flat steel saw-like blades. These blades dull quickly, so if the cutting performance deteriorates, it’s time to replace them or sharpen them.
  2. Reel Mower
    Uses vertically rotating cylinder blades made of hardened steel. These blades don’t need frequent replacement but must be sharpened to maintain cutting efficiency.
  3. String Trimmer
    Uses high-speed rotating nylon or synthetic strings for trimming edges and corners. It requires regular string replacement depending on usage.
  4. Robotic Mower
    Often features rectangular blades on a rotating circular disk, operating at high speeds. Blade replacement is generally recommended every 4 to 10 weeks.

Blade Types

The material and design of the blades influence the need for replacement and its timing:

  1. Durability of Different Materials
    Lawn mower blades are commonly made of steel, stainless steel, or alloys. Steel blades are cheaper but dull faster. Stainless steel blades resist corrosion, suitable for varied environments, and high-grade alloy blades offer longer lifespans.
  2. Special Design Blades
    Some blades have specific designs, like high-lift blades, which provide improved cutting quality by finely chopping grass. These blades, used in special conditions, require regular inspection and maintenance.

7 Steps to Replace Lawn Mower Blades

  1.  
7 Steps to Replace Lawn Mower Blades

Knowing the correct method for replacing blades can prevent damage to the mower, blades, and reduce the risk of personal injury. Here are the general steps for replacing blades, including common tools and the necessary disassembly and reassembly checks.

Step 1: Prepare Tools

  • Removal Tools
    Commonly used wrenches or socket wrenches. Refer to your product manual for the appropriate tools.
  • Protective Gear
    Gloves and plastic sheeting. Wear gloves to prevent injuries during the replacement process, and lay down plastic sheeting to protect the mower and the surrounding area from scratches.

Step 2: Ensure the Mower is Off

  • Electric Mowers
    Turn off the mower and unplug it to prevent accidental start-up.
  • Battery-Powered Mowers
    Turn off the mower and remove the battery if it’s removable to avoid accidents.

Step 3: Flip the Mower

Flip the mower according to the blade’s position. Most mower blades are installed underneath, so usually, a side flip is needed. Lean it against a wall for easy access to the blades.

Step 4: Remove the Blade

Use a wrench or socket wrench to loosen the screws securing the blade. Note the direction of the screws and the blade for correct reinstallation.

Step 5: Inspect the Old Blade

After removing the blade, check for wear and tear. If the blade is severely dulled, deformed, or damaged, it needs to be replaced.

Step 6: Install the New Blade

Place the new blade in the same position and use the wrench or socket wrench to tighten the screws in the correct direction. Ensure the blade is securely fastened without any looseness to avoid danger or reduced cutting performance.

Step 7: Restart the Mower

Flip the mower back to its original position, place it in a suitable mowing area, plug in the power cord or reinstall the battery, and turn it on. Perform a test cut to ensure the blade operates correctly.


Why Do You Need to Replace Your Lawn Mower Blade?

Why Do You Need to Replace Lawn Mower Blade?

Regularly replacing lawn mower blades is essential to maintain mowing performance and efficiency. It helps prevent damage to the lawn, prolongs the mower’s lifespan, and ensures that mowing is both time-efficient and effortless.

Recommended Blade Replacement Frequency

Generally, lawn mower blades should be replaced every 1 to 2 years. However, for professional gardeners who mow frequently or work in tough conditions, the interval may need to be shorter. The actual frequency depends on usage and the factors mentioned earlier, such as blade dullness and mowing performance.

Before opting for replacement, regular sharpening of the blades can be beneficial. The article “How often should you sharpen your lawn mower blades? Does it even matter?” suggests that professionals sharpen their blades weekly or approximately every 25 hours of mowing time. This guideline can help users determine when sharpening or replacement is necessary.

 

Table 1: Optimal Lawn Mower Blade Sharpening Frequency

Criteria

Recommendation

Average Homeowner

Every 25 hours of use

Minimum Requirement

Once every season

For Optimal Lawn Health

Two to three times per season

Based on Professional Advice

Every 25 hours of use

Resource: <How often should you sharpen your lawn mower blades? Does it even matter?>

Benefits and Necessity of Blade Replacement

Timely replacement of lawn mower blades not only enhances lawn performance but also extends the mower’s lifespan, improves efficiency, creating a win-win-win situation for the lawn, mower, and user:

  • Enhanced Mowing Efficiency
    Sharp blades accelerate grass trimming, reducing mowing time and human effort.
  • Improved Lawn Appearance
    Neat and uniform grass cutting prevents tearing and damage, promoting faster and healthier lawn growth, resulting in an aesthetically pleasing lawn.
  • Enhanced Safety
    Damaged or dull blades can cause unstable machine operation or accidents.
  • Energy Savings
    Reduced operating resistance leads to less power consumption, saving costs and being environmentally friendly.
  • Extended Mower Lifespan
    Reduced workload decreases engine, motor, or other component stress, slowing down wear and tear, and extending the lifespan.
  • Reduced Maintenance Costs
    Less machine damage reduces repair and replacement costs.
  • Comfortable Operation
    Stable machine operation reduces vibration and noise, enhancing operator comfort.

Problems Caused by Not Replacing Blades

If blades are rusted or severely damaged, they cannot efficiently perform grass cutting, leading to grass tearing and potential lawn damage. Additionally, abnormal mower operation increases the risk of damage and prolongs mowing time, resulting in increased resource consumption:

  • Decreased Cutting Efficiency
    Dull blades are ineffective at cutting grass, requiring multiple passes to achieve desired results, increasing mowing time and physical exertion.
  • Contaminated Lawn
    Torn grass and rusted blades can contaminate the lawn, affecting grass growth and making it more prone to yellowing.
  • Increased Disease Risk
    Torn grass is more susceptible to disease and pests, affecting overall lawn health.
  • Increased Mower Burden
    Increased engine or motor stress may cause overheating or damage to the machine.
  • Higher Maintenance Costs
    Dull blades increase operating resistance, accelerating wear on other components such as bearings.
  • Increased Vibration and Noise
    Dull blades may cause increased vibration and noise during operation.
  • Safety Risk
    Severely worn or damaged blades can break during high-speed operation, leading to accidents or machine malfunction.

Easily to Remove Lawn Mower Blade with NEXMOW

Remove NEXMOW Robotic Mower Blade

Unlike traditional lawn mowers that require complex blade replacement processes and numerous parts and tools, replacing blades for the NEXMOW robotic mower is simple and straightforward with common tools:

Tools and Parts

  • 1 set of new blade kit (including 5 blades and replacement screws)
  • 1 cross-head screwdriver

     

Replacement Process

  1. Power off the robotic mower.
  2. Wear protective gloves.
  3. Stand the robotic mower upright against a wall or any vertical surface to ensure stability.
  4. Use the screwdriver to remove the screws securing the protective disk, then remove the protective disk.
  5. Unscrew the screws securing the blades on the cutting deck and remove the blades.
  6. Install the new washers onto the new screws.
  7. Place the new blade onto the cutting deck.
  8. Secure the blade onto the cutting deck with the screws containing washers, and hand-tighten.
  9. Ensure the blade can rotate freely.
  10. Screw the protective disk back into place.
  11. Lay the robotic mower flat and move it to a suitable and safe area for mowing testing.

 

Simple Maintenance NEXMOW Robotic Mower

Simple Maintenance NEXMOW Robotic Mower

No matter what type of lawn mower you have, keeping it clean is essential for achieving optimal mowing results. However, cleaning can be time-consuming and laborious, often discouraging people from doing it. The design of the NEXMOW robotic mower makes maintaining it incredibly simple!

  • Easy-to-Access Tools
    You only need common household tools like a soft brush to clean the cutting deck, or an air gun for assistance, without the need to purchase special cleaning products.
  • No Greasy Mess
    The NEXMOW robotic mower operates on lithium batteries, eliminating concerns about oil leaks when tilting or flipping the machine to replace blades.
  • Simple and Quick Process
    There’s no need for intricate disassembly of the machine; simply stand it upright to complete the cleaning process quickly and easily.

Mowing can be time-consuming and labor-intensive, but the cleaning method of the NEXMOW robotic mower is convenient and swift, sparing you from spending too much time or effort. Spending just 5 to 10 minutes after each mowing task to keep the cutting deck clean not only improves efficiency for the next mowing session but also extends the lifespan of blades and the machine itself, saving time, effort, and money! With the NEXMOW smart robotic mower, not only does mowing become simple and fast, but cleaning does too!

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