Lawn Mower Makes Grinding Noise When Trying to Start(Solved)

Lawn mowers are essential tools for maintaining a well-kept lawn.

However, encountering issues with your lawn mower can be frustrating, especially when it makes a grinding noise while trying to start.

In this post, we will explore the common causes of this problem and provide you with troubleshooting tips and preventive maintenance advice to keep your lawn mower running smoothly.

Let’s get started.

Lawn Mower Makes Grinding Noise When Trying to Start

Common Causes of Grinding Noise in Lawn Mowers:

1. Lack of Lubrication

One possible cause of a grinding noise when starting your lawn mower is a lack of lubrication.

Over time, the moving parts of the mower, such as the engine, blade, and cutting system, may become dry and lose their smooth operation.

This can lead to friction and grinding noises.

2. Damaged Blade or Cutting System

Another reason for a grinding noise could be a damaged blade or cutting system. If the blade is dull, bent, or out of balance,

It can create an uneven cutting motion, resulting in grinding sounds. Similarly, a misaligned or worn-out cutting system can cause excessive vibrations and noises during startup.

3. Engine Problems

Grinding noises during startup can also indicate underlying engine issues.

A worn-out starter motor or a malfunctioning flywheel gear can produce grinding sounds when the engine is being cranked.

Additionally, problems with the engine’s internal components, such as the piston or crankshaft, may also contribute to the noise.

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How to Fix Grinding Noise When Trying to Start

1. Checking the Lubrication

  • Start by checking the lubrication levels of your lawn mower. Refer to the manufacturer’s instructions for the appropriate lubrication points and recommended lubricants.
  • Apply lubricant to the moving parts, including the engine, blade, and cutting system. Ensure that you use the right type of lubricant as specified in the user manual.
  • After lubrication, attempt to start the lawn mower again and check if the grinding noise persists.

2. Inspecting the Blade and Cutting System

  • Carefully inspect the blade for any signs of damage, such as dullness, bends, or cracks. If necessary, sharpen or replace the blade according to the manufacturer’s guidelines.
  • Examine the cutting system for misalignment or wear. Tighten any loose components and replace worn-out parts as needed.
  • Restart the lawn mower to determine if the grinding noise has been resolved.

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3. Diagnosing Engine Issues

  • If the grinding noise persists, it may indicate engine problems. Consult the user manual or seek professional assistance to diagnose and repair the engine.
  • Inspect the starter motor and flywheel gear for any signs of damage or malfunction. Replace these components if necessary.
  • If the engine’s internal components are suspected to be the cause, it is advisable to take the lawn mower to a certified repair center for further inspection and repairs.

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Preventive Maintenance Tips

To prevent grinding noise issues with your lawn mower, follow these preventive maintenance tips:

Regular Blade Maintenance

  • Regularly inspect the blade for signs of wear and damage.
  • Sharpen or replace the blade as recommended by the manufacturer.
  • Balance the blade to ensure smooth operation and minimize vibrations.

Proper Lubrication

  • Follow the manufacturer’s guidelines for lubricating your lawn mower.
  • Regularly apply lubricant to the designated parts to reduce friction and prevent grinding noises.

Engine Care

  • Perform routine maintenance on the engine, such as changing the oil, cleaning the air filter, and replacing spark plugs.
  • adhere to the manufacturer’s recommended maintenance schedule.
  • Store the lawn mower in a clean and dry area to prevent rust and other damage.

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Why does my lawn mower sound like its struggling?

Lack of maintenance

Insufficient cleaning, not changing the oil regularly, or neglecting air filter replacement can lead to decreased performance and a struggling sound.

Dull or damaged blades

Blades that are dull or damaged from hitting objects can result in inefficient cutting and require more effort from the mower’s engine.

Engine issues

Problems like a dirty carburetor, clogged fuel filter, or faulty spark plug can affect the fuel-air mixture and combustion efficiency, causing the engine to struggle.

Improper fuel mixture

Using the wrong fuel mixture or stale fuel can impact performance and lead to a struggling sound.

It’s important to follow the manufacturer’s instructions for the correct fuel type and mixture.

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Final Remarks

Dealing with a grinding noise when trying to start your lawn mower can be a frustrating experience.

By understanding the common causes of this issue and following the troubleshooting steps outlined in this article, you can effectively address the problem and keep your lawn mower in optimal condition.

Remember to prioritize preventive maintenance to minimize the occurrence of grinding noises in the future.


Can I use any type of lubricant for my lawn mower?  

It is important to use the lubricants recommended by the manufacturer to ensure compatibility and effectiveness.

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How often should I sharpen the lawn mower blade? 

The frequency of blade sharpening depends on usage. As a general guideline, it is recommended to sharpen the blade at the beginning of each mowing season or after approximately 25 hours of use.

Can I fix the grinding noise issue myself, or should I seek professional help?

Homeowners are capable of performing simple maintenance tasks like lubrication and blade inspection.

However, if the issue persists or involves engine problems, it is advisable to seek professional assistance.

How can I prevent excessive vibrations in my lawn mower? 

To minimize vibrations, ensure the blade is balanced, tighten any loose components, and keep the cutting system well-maintained.

What should I do if the grinding noise continues even after troubleshooting?  

If the grinding noise persists, it is recommended to consult a professional lawn mower repair service for a thorough inspection and resolution of the issue.

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George Bill
George Bill

George Bill is a Mechanical Engineer by Profession and an avid gardener and has been mowing his lawn for over 20 years. He has used a variety of different mowers during this time.
George is an expert at maintaining his mowers and over the years, he has learned many tricks and techniques for getting the best results from his mowers and is always happy to share his knowledge on this site.