angle grinder overheating

Angle Grinder Overheating: How to Fix it?

Angle grinders are easy to use, versatile, and they provide a hard and smooth surface for polishing. Today’s models are superior to their earlier counterparts when it comes to their quality and lifetime guarantee. Unfortunately, though, there are a few downsides you should be aware of. One of them is angle grinder overheating, which can result in angle grinder malfunctioning. Here’s what you should do if your angle grinder starts heating up after prolonged use.

Why Is My Angle Grinder Overheating?

Angle grinder overheating can be the result of a few causes, but most often, it’s the result of clogged or damaged parts.

If the angle grinder is overworked, it will heat up faster because there are more pathways for heat to escape.

Another cause is the worn or damaged cutting head that allows too much debris to enter and damage the bearings. For example, if the angle grinder overheats frequently, it could be due to a worn cutting head or excessive heat buildup, as mentioned above.

The best way to check for this is by using your angle grinder in an enclosed space where the airflow can’t escape easily. You should also keep the tool cool with water-based lubricants and do not use any types of oil that are flammable such as kerosene or acetone, when cutting.

Signs of Angle Grinder Overheating

If the angle grinder is overheating, it will start making strange noises or will not function properly. In other cases, you can feel the smoking smell or parts of the grinder working will start burning out, and cannot be touched by bare hands. The first thing you should do is stop using it and unplug it from the power source.

In this case, you’ll need to take it to a professional for a repair procedure. There are several ways to fix the overheating grinder. The best way is to take it to an angle grinder repair guides shop specializing in such repairs or do the job yourself if you know how to properly use power tools and have all the necessary tools on hand.

How to Fix Angle Grinder Overheating?

There are a few things you can do to try and cool down an angle grinder that is overheating:

  1. Stop using the tool and unplug it from the power source if it’s not cooling down after a few minutes. Check for any clogged or damaged parts, clean obstructions if possible with a wire brush, verify there’s enough lubrication oil or grease in the bearings, and add more if necessary.
  2. Take an angle grinder to the destination for tech repair if it overheats frequently. There’s evidence that the tool has been overheating more than usual, like melted plastic parts, metal parts have warped or cracked due to heat expansion, etc., damage surrounding components such as insulation, the bearings are cracked or damaged, etc.
  3. Dump the motor oil and use a new cutting head if overheating is not related to heat buildup but rather excessive pressure after prolonged usage (e.g., the grinder has worked continuously for a long time without encountering any obstructions). Oil needs to be changed when the angle grinder runs above normal operating temperature due to heavy loads such as using it inside under carpeting, hard concrete, etc.
  4. Use the grinder in a cool environment and try cutting wood, rubber, or other similar materials that do not get hot fast to try cooling the tool down while it’s operating, as this will help cool down the motor faster than if used outside on concrete where air conditioners are installed in homes and offices which keep temperatures cooler even when running inside because metal emits heat quickly due to friction.
  5. Inspect the cutting head for any broken or bent pieces of metal and replace them if needed, as well as angle grinder tool accessories such as sandpaper rolls, etc., to check whether they are also damaged due to overheating (e.g., melt-resistant plastic on brushes).
  6. Clean the grinder cutting head for any debris or dust buildup which may cause overheating and grinding friction, etc. Suppose dirt, metal particles, or other foreign materials are caught in the grinder’s cutting teeth. In that case, they will catch on to material being cut, causing damage to it (breaking blades) as well as changing its configuration even though angle grinder manufacturers claim that this type of tool is not affected by heat.
  7. Inspect the angle grinder tool accessories such as brushes, etc., for overheating and replace any damaged parts that are overheated or worn out with new ones of the same type if these have not been replaced in a while (e.g., cutting heads).
  8. Remove any foreign materials from the air filter by using compressed air to blow all loose dust off it and then reinstall this back into the grinder tool to ensure that the grinder tool vents air outside the grinder.
  9. Ensure all power switches on both motor and optical power producing unit switches are turned off to prevent overheating. The angle grinder stops cutting once it has reached its maximum cutting capacity.

Angle Grinder Overheating: Role of Different Parts


A grinder’s armature is the part of the tool that converts rotational power (generated from the motor) to linear power, which is then used to cut materials. A faulty cooling fan, high dust accumulation, or blocked cooling ports can all cause the armature to overheat. Working in a heated workplace might also cause this condition. When you notice that your grinder’s armature has become overheated, clean it first with an electrical contact cleaner. Then, within the commutator, look for damaged marks and missing bars, and replace the armature if one is missing. 


Bearings are the key component that keeps the armature rotating and cutting. Overheating can cause bearings to heat up so quickly that they begin to break down. A jammed bearing on the tool’s armature shaft will generate a lot of heat and cause a rapid rise in temperature. To determine whether the bearings are seized, you should first remove them. Spin the bearings with your hands if you can. If a bearing doesn’t spin, it’s seized and needs to be replaced with a new one.

Air Filters

A grinder’s air filter helps protect the engine from dirt, metal particles, or other foreign materials that could potentially damage the engine. The air filter might be damaged by overheating. This might cause blade wear or damage due to grinding friction. Check for symptoms of angle grinder overheating in the air filter and repair any broken parts.


A grinder’s fans help the tool cool down and prevent overheating. There will be no cool air ventilation inside this strong weapon if the fan is not in operation, resulting in overheating. If the fan appears to be broken, you should replace it with a new one. Because the position of the fan on different grinders may differ, the repair technique may also differ.


Brushes help the grinder spin and cut materials. Angle grinder overheating can cause brushes to heat up. This can lead to grinding friction and eventually blade wear or signs of damage. By removing the carbon brushes from the tool, you can see if they are broken or not. On some models, you must remove the tool’s power cover, find the brushes, and then loosen the tension springs to remove the brushes. 


Gears are the main component that helps to power supply the grinder. Angle grinder overheating can cause gears to overheat to the point of breaking down. If left unattended, this condition could result in serious consequences such as shorting out, tool failure, or smoke. Remove the field from the gearbox, clean it with an electrical cleaner, and look for burn marks and excessive sparking. Replace it with a new one if there are any signs of damage. 


Fields help the grinder to move materials. Angle grinder overheating can cause fields to heat up so quickly that they begin to break down. This can lead to grinding friction and eventually blade wear or damage. This portion accumulates heavy dirt and debris over time, preventing it from evenly releasing heat. If left unattended, this condition could result in serious consequences such as shorting out, tool failure, or smoke. Remove the field from the gearbox, clean it with an electrical cleaner, and look for burn marks and excessive sparking. Replace it with a new one if there are any signs of damage.


The grinder wheel is assisted in moving materials by reels. Reels can overheat to the point where they begin to break down due to angle grinder overheating. This might cause blade wear or damage due to grinding friction. Examine the reels for signs of angle grinder overheating and replace any broken components. 

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What should I do if the angle grinder overheats?

If the angle grinder overheats, it may damage its fans or gears. Inspect these components for signs of overheating and replace them if necessary. Additionally, check the field and reel systems for heat buildup and replace any parts that are damaged. 

Should I take the parts out one at a time as they heat up?

It is best to power the angle grinder down slowly and removes the parts one by one. As long as the metal of these components does not start to soften or melt, you can continue removing them from the machine without causing damage.


Angle grinders are powerful tools, but they do come with some risks. If you’re having trouble with your angle grinder and want to know how to fix it, this blog post is for you. By reading this guide, you’ll learn why your angle grinder may be overheating and what you can do about it.

Read Also: Angle Grinder Sparks | Safety Precautions

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