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Reducing Lawn Mower Noise Levels

If you love mowing your lawn but often hate the sound it makes, then this article will prove useful to you. There are several ways you can decrease the amount of noise your mower makes, this includes; alteration of the oil regularly, toughening the bolts, substituting the muffler, and repairing the edge of the tool.

This write-up will explain why lawnmowers produce a lot of noise and help you figure out how to limit lawnmower noise levels. Read through to learn more.

Why do Lawnmowers Make a Lot of Noise?

We all know that lawnmowers must produce a sound when in use. However, some products are noisier than others and as it deteriorates with time, the noise becomes more intense.

Most manufacturers of lawnmowers do not spend much time trying to remedy the noise issue or produce quieter products. Their primary concern is the machine’s ability to work.

When a lawnmower is started up, its engine part begins to vibrate as it works. This causes the machine to produce a very hard-to-miss sound. The vibrations make their way into the air and become sound waves [1] that most persons will find irritating.

Alongside the noise, you also have to put up with the rattling machine. Electric mowers usually produce the least noise, but their noise levels are still significant.

 

 

Regular lawn mowers can produce loud noises up to 90dB. This is loud and long exposure to this sound level should be avoided to prevent hurting your ears. Since you’ll be using the lawnmower from time to time, it is important to ensure the machine is as quiet as it can be.

As time passes, the machine will begin to wear and this will further aggravate the noise problem. Loose screws will increase rattling sounds and things could get broken in the machine.

Here are some common issues that could generate more noise:

  • Loose blade assembly
  • Broken muffler
  • Overstayed engine oil

To prevent any of these from happening, you have to take maintenance seriously. This will help you detect any threat and fix them early before they become an issue in the future. If you hear any abnormal sounds such as clunking or squeaky noises, carefully inspect the machine to detect the problem.

 

 

Before you attempt to limit the amount of noise your mower produces, perform an inspection to ensure it is in perfect working condition. This is important so you don’t miss out on any indicators of a problem.

After inspecting your machine and confirming it’s in a good state, you can now follow the steps below to limit its noisiness.

How To Limit Lawnmower Noise

Tighten Screws

Loose screws equal more rattling and that causes more noise which is what we’re trying to prevent. Tighten every screw you find. It may be necessary to take the machine apart to reach the interior so you can thoroughly inspect the entire machine for loose screws. Once you’ve finished tightening the screws, you can assemble the machine back together.

Repair or Replace Your Muffler

The muffler is found attached to the exhaust pipe. They help to dampen the sound which it produces. A muffler consists of numerous chambers and it provides insulation while increasing the engine’s pressure for higher functionality.

Due to the intense stress, the muffler has to go throw, it is bound to get cracked or broken with time. The formation of cracks creates room for the sound to escape and this limits its sound-absorbent abilities. How do you ensure your muffler is in a healthy condition?

Follow the steps below:

  • When the machine is cool, loosen your exhaust pipe.
  • Take out the exhaust to fully reach the muffler as it’s usually found deep within the mower.
  • Unscrew the bolts to completely free the muffler.
  • Look out for any cracks or gaps on both sides. Cracks may develop on just one side so ensure you inspect both.
  • You can fix shallow cracks using a product called FiberFix. You can purchase it online.
  • If you notice deep cracks or rust, it’s time to replace the muffler with a brand new one. Ensure you get a quality product for your lawnmower. Longer mufflers usually do a better job of dampening sound than shorter products so keep that in mind.
  • You can also inspect your exhaust pipe for any damage and replace it if necessary.

 

Change Your Engine Oil Regularly

It’s easy to forget about changing oil. However, failure to do so can contribute to increased noise levels and other issues. You must change the oil regularly so your machine remains in an ideal state. The oil helps to lubricate your engine’s mobile parts. If left for too long, the oil can accumulate so much dirt which will cause clogging.

 

 

Put in fresh oil sometime in the spring and perhaps in the fall too. How often you use the machine will determine how early you change the engine oil. To change your engine oil, follow the steps below:

  • Position the lawnmower on an elevated platform and make it lie on the side
  • Place a pan under the oil cap
  • Take off the cap and allow the old oil to come out.
  • Once the old oil has completely drained out, fill up with the new oil. The product’s manual will contain instructions on what kind of oil is okay for the machine.
  • If you observe the old oil was darker than usual or filled with so much debris, it might be an indicator of a problem. You might want to consult a professional to ensure your machine is okay.

 

Add Extra Mass to Your Deck

You’ll find the deck located directly after the blade and it’s made from a plastic material. Just like the muffler, it also helps to limit the noise created by the machine.

To further hone in on its soundproofing ability, add extra mass to your deck. You can’t do much about the blades. However, with an additional mass on your deck, the noise made by the blades right under it will be reduced. You can work with sound dampening mats for cars or MLV (mass loaded vinyl). Follow these steps to add extra mass to your deck:

  • Position the mower lying on its side to give you a clear visual of the blades. You can take out the spark plug so the machine doesn’t come on.
  • Spray under the deck with water (use a hose preferably) to wash down accumulated grass.
  • With a scrapper, get rid of the dirt and grass build-up underneath. This single act will limit the sound it produces.
  • Turn your mower with its right side facing up and then clean the deck’s top to enhance adhesion.
  • Cut up your sound dampening material to a suitable size
  • Tick the material to the deck. Be careful not to obstruct any mobile part. Add two layers to increase soundproofing ability.

Summarily, the plan is to limit the vibration of the deck with additional mass and also dampen noise created by the blades.

 

Repair Your Blade Assembly

If your blade assembly becomes loose, it will result in increased rattling noise. This may cause other problems to the machine if left unattended. Remedy loose blades with these steps:

  • Remove your spark plug and position the mower to lie on the side.
  • Check the bolt which holds the blade intact with a wrench.
  • If the bolt is loose, jam your blade with a wood piece and tighten it up.
  • If you notice the problem persists, it may be due to a balance problem. You can solve this by purchasing a balancing tool for your blade.

 

Replace Your Lawn Mower

Now, your lawnmower will produce more noise and develop more issues the older it gets. If you want a quieter and more efficient machine, the best thing you can do is purchase a brand new one.

In terms of quietness, electric lawnmowers offer the best value. This is because they don’t work with petrol so there is less vibration and that means less noise is produced.

Some people might not be so keen on purchasing a product with power cables. You can go for products that run on rechargeable batteries. Whichever product you decide to get, a new lawnmower will surely be quieter than an old, raggedy one.

Conclusion

A lawnmower is sure to produce a certain amount of noise. However, you can keep that in check by doing a few things. Regular maintenance makes a lot of difference. Ensure you inspect your machine often for any issues and change the engine oil regularly.

This will help you locate any minor indicators of an issue and you’ll deal with it on time.

Glossary

[1] Sound waves – Link