electric lawn mower


If you have ever noticed a hot odor coming from your lawnmower, it is probably because your lawnmower is overheating.

Your lawnmower is a workhorse during the summer heat, but it’s not indestructible. The combination of high temperatures and long operation hours can put substantial thermal stress on its engine which could lead to problems with performance or durability! But don’t worry, you’re not alone! Many homeowners have experienced this issue at one time or another. However, it’s important to suspend any activity involving the engine. Then find out the causes behind it before any greater engine damage is done.

In this blog post, we will discuss some of the most important causes of lawn mower overheating, as well as what you can do to fix the problem.

Lawn Mower Overheating: Causes and Solutions

Good lawn mowers should be able to handle hot temperatures. However, several issues can cause overheating in your engine and make it unable to work properly.

When your lawn mower engine overheats, it can risk various components expanding and seizing up. If you intend to know more about why the overheating occurs and what to do if it does, please, read on!

1. The Wrong Engine Oil

You might be surprised to learn that the type of engine oil you use in your lawnmower can have a big impact on its performance. Not using the right oil can overheat your lawnmower’s engine.

Lawn Mowers such as a Riding Lawn Mower and Walk-Behind ones have engines that are designed with an oil mixture that contains high concentrations of zinc. This element helps keep the engine cool by reducing its ability to absorb heat.

Normal motor oils aren’t much zinc enriched. Hence, using those in your lawnmower engine can indeed cause overheating.


So, to solve the overheating problem arising from the above cause? The answer is simple: replace your oil with such oils that can handle this overheating issue.

Here, are some proven options you can choose from:

  • 15W-50 Synthetic Oil
  • SAE 5w-30 Synthetic Oil
  • 10w-30 Synthetic Oil
  • SAE 30 Oil
  • 20W50 Oil

2. Low Oil Level

One of the most usual causes of an overheating lawnmower is the low engine oil level. If you know how to use an electric lawnmower, you understand the significance of checking and maintaining it. Lower oil levels are responsible for causing constant additional internal frictions resulting in unnecessary heat production, ultimately, leading to engine overheating.


To avoid this problem, always check your lawnmower’s oil before starting it up and keep extra fuel on hand in case you need to add more during use!

Note that, if you find low oil levels in a running engine, you should leave it for cooling down before adding any oil to it.

3. Blocked Cooling Fins

The cooling fins are small, movable pieces of metal that help dissipate heat from the lawnmower engine. They are found next to the spark plug.

If they get blocked or damaged in some way, then your lawn mower might overheat quickly due to its inability to release excess warmth. The cooling fins can get blocked in many ways ranging from dirt and debris to grass clippings.


The only solution to this problem is to clean your cooling fins occasionally.

4. Clogged Air Intake

The plugs in your mower’s air filter are the perfect place for dirt and debris to settle, which will cause it to not work properly.

This can lead your machine to run hotter because there isn’t enough airflow through this area of the engine. This will most likely result in an overworked fan cooling system, causing the engine of your lawnmower to overheat.


In this case, you can check your lawnmower’s air filter and if you find it clogged, then you can replace it with new air filters. Don’t worry, it won’t cost much.

It’s better to buy new air filters occasionally rather than buying an entire engine to replace your damaged one.

If you’re in need of a new lawn mower then give our buying guide a read.

5. Mower Deck Overload

If you know how electric lawnmowers work, you should be aware that the mower casing or deck is frequently full of grass and dirt. It can clog the blades and make it more difficult to rotate your mowing deck.

Which compromises the flexibility of the blades, resulting in a high workload on the blades. This, in turn, can cause the lawnmower to overheat.


To keep your lawnmower from overheating, it’s important to clean the deck of any dirt or grass regularly. Regularly scheduled cleaning will prevent build-up that could jam up mechanisms and heat the engine over time.

Another solution to this is to completely avoid cutting wet grass. Every product you buy is an asset and it’s better to wait a few days than to damage one.

6. Overworked Engine

If you want to get the best out of your investment in your Lawn Mower, make sure that the mower’s engine is working at full capacity. Running it through thick or wet grass will cause overheating due to the engine being overworked.


You can easily solve this issue by waiting for your wet lawn to dry out. And to solve the thick grass issue, you can clip grasses in two or three turns, gradually, shortening them.

7. Misplaced Engine Shield

Your lawnmower’s engine shield can easily get misplaced even after a single day of rigorous mowing. This occurs if a screw has accidentally fallen out or got lost.

If this happens the shield will no longer be in the appropriate place resulting in a small leakage that could let the air exit from the engine. Resulting in an overheated lawnmower engine.


The engine guard or engine shield is an important part that should never be forgotten. Do ensure it stays in place by tightening or replacing any mounting screws!

Dull blades on lawn mower
Dull blades on lawn mower.

8. Dull Blades

The Lawn Mower engine overheats when its blades go dull or blunt. This imposes a higher workload on the engine, causing it to overheat.


This problem can be solved if you are willing to check your mower blades occasionally. And if they seem dull or blunt, then you can either sharpen them with a file or entirely replace them with new ones. Whichever suits your needs!


Machines are technical devices, and as such, they can overheat. But the chances that your mower will need servicing are minimal if you take care of it properly in the first place!

In this blog post, we have provided you with necessary information about 8 causes of lawnmower overheating. We have also suggested necessary solutions to help you deal with problems associated with those causes.

So, if your lawn care company is busy for some reason, don’t be worried! Because now you know, how to prevent your lawnmower from overheating. Thanks for reading!


1. Why Does My Lawn Mower Stop When It Gets Hot?

If you have an air leak in your lawnmower due to loosen bolts or screws, it can expose the engine to too much outside atmosphere and throw off its fuel-air mixture ratio. The engine will then get hotter and hotter as it works, expanding and making the tiny gaps larger resulting in the engine stopping.

2. How Do I Cool Down My Lawn Mower?

We would recommend you do nothing especially and don’t spray water if your lawnmower engine is overheated. Just let the engine idle and let it cool down by itself.

After it cools down you can apply other solutions such as changing the oil or cleaning the engine for preventing any further overheating issues.

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