Why is My Miter Saw Making a Noise (Grinding & Loud)?

Why is my miter saw making a grinding noise?

Your miter saw is making a grinding noise because the bearing is worn out as it’s rotating inside the housing. A bad armature or a worn-out brush due to frequent contact are another reasons your miter saw makes a grinding noise.

 

 

Worn-out bearing

Noise like grinding will occur when the bearing in your miter saw is worn-out. The grinding noise is produced as the worn-out bearing rotates in its housing. You need to replace the miter saw’s bearings to resolve the problem.

 

Bad armature

The armature of your miter saw is essential to its operation and the smooth rotation of its blades. It contributes to the motor’s regular operation. When the armature is bad, your miter saw will start to make a grinding noise.

Whenever you notice this, open up your miter saw and check the condition of the armature. This may be a difficult task, but we have provided a guide below.

 

Broken brush

The carbon brushes ride on the commutator and transmit power to the armature. They’ll eventually wear down and make a grinding noise due to the frequent contact. This noise is caused when a miter saw brush becomes jammed between the housing, commutator, or another component.

You will need to replace the carbon brush to fix this; see our guide below.

 

How to fix a miter saw that is making a grinding noise?

You can fix a miter saw that is making a grinding noise by replacing the bearing. Replacing the armature or replacing the carbon brushes is another method you can use to fix a miter saw that is making a grinding noise.

 

Replace the bearing

If the bearing in your miter saw is worn-out, your miter saw will start making a grinding noise. You must replace the bearing to stop your miter saw from making a grinding noise. Here is how to replace it;

1. Carefully clamp the armature of the miter saw in a vise and use a multi-tool to secure the two opposite sides of the armature bearing.
2. Take the armature out of the vise and turn it so that the vise is only holding the armature bearing.
3. To remove the outer race from the armature bearing, hold the armature’s body with one hand while using the vise lever with the other; the bearing should pop and fall to the floor.
4. Take the armature out of the vice and carefully clamp down on its body. Take off the balls and cage from the bearing’s inner race with a pair of needle-nose pliers.
5. A bearing separator and a bearing puller are needed to get the inner race of the bearing off of the armature. First, attach a bearing separator to the armature bearing’s inner race.
6. Then install the new bearing.
7. Screw the armature shaft screw back into the armature previously unscrewed during the miter saw’s disassembly.
8. Attach a pair of bearing pullers to the bearing separator.
9. Now that the bearing pullers are attached to the bearing separator, which is attached to the inner race of the armature bearing, use the bearing pullers to pull all three parts off the armature.

 

Replace the armature

The armature is an important part of the miter saw because it makes the blades rotate smoothly. If your armature is bad, your miter saw will start making a grinding noise, and replacing it is the only option you have to fix. Here is how to replace it;

1. Remove the two screws holding the field case’s end cap.
2. Remove the cap at the end of the saw.
3. Use a screwdriver with a flat blade to remove the two brush caps.
4. Remove the carrying handle.
5. Remove the handle’s top half.
6. Remove the white cord wire from the insulated terminal connector.
7. Remove the screw that keeps the switch attached to the lower handle.
8. Take the switch assembly out of the case by lifting it up.
9. Note the location of the switch wires for reassembly.
10. Disconnect the wires from the switch assembly.
11. Take the power switch and cord out of the handle.
12. Remove the lower half of the handle.
13. Remove the four screws that hold the gear case to the field case
14. Remove the field case.
15. Remove the armature.
16. Put the new armature on the gear housing.
17. Rotate the armature as needed to engage the gears.
18. Press the armature firmly toward the gear housing to set the retaining ring (O-ring).
19. Put the field case back together.
20. Put the lower handle back on.
21. Put the switch and cord back in place.
22. Put the top half of the handle back on.
23. Put the carrying handle back on.
24. Put the motor brushes back on.
25. Put the end cap back on.
26. Start your engine!

 

Replace the carbon brushes

The carbon brushes get power from the commutator and send it to the armature. Since they are always striking, they will wear down and make noises like grinding. If the carbon brush becomes broken, you will need to replace it with a new one. Here is how to replace it;

1. Remove the brush cap with a big screwdriver.
2. Take the motor brush out of the brush holder.
3. Repeat this procedure to remove the second motor brush (on the opposite side of the motor).
4. Install the new carbon brush in the brush holder.
5. Align the brush spring’s tabs with the brush holder and compress the brush spring into the brush holder.
6. Secure the new carbon brush with the brush cap (do not overtighten).
7. Repeat this procedure to install the second carbon brush (on the opposite side of the motor).

 

Why is my miter saw making a loud noise?

The reason your miter saw is making a loud noise is because the brake in the miter saw is failing. A worn gear or a worn-out drive belt is another reason your miter saw makes a loud noise.

 

Failed brake

The brake stops the miter saw blade in 2-3 seconds. However, the blade might fail, making the miter saw start making a loud noise. The brake may fail due to several reasons, which include a clogger commutator, a bad switch, or a failing armature.

Depending on the cause of the failed brake, you can either change the brake entirely or fix the cause of the failing brake to avoid this problem.

 

Worn gear

Gears move power from one shaft to another. A worn gear will make a loud noise because the teeth of the gears can’t fit together. Repairing varies from model to model.

 

Worn drive belt

Loud noises might be caused by a worn drive belt. When your miter saw starts making a loud noise, it indicates that the belt is worn and needs replacement or adjustment. If your unit has an adjustment screw, try tightening the belt first.

However, some models don’t have a screw for adjusting, so you have to replace the belt when it gets worn out.

 

How to fix a miter saw that is making a loud noise?

You can fix a miter saw that makes a loud noise by replacing the belt. Replacing the gear drive or replacing the carbon brush is another method you can use to fix a miter saw that is making a loud noise.

 

Replace the belt

If the belt in your miter saw becomes worn out, your miter saw will start making a loud noise. When this happens, it is important that you first try to tighten the belt, and if, after tightening, it is still making noise, then you need to replace it with a new one. Here is how to replace it;

1. Remove the screw securing the belt cover, and then take the cover off.
2. Pull the belt out as you rotate it around both pulleys.
3. Wrap the belt around one pulley’s edge.
4. Then, wrap it around the second pulley and pull it in as you turn it around the pulleys.
5. To finish the repair, put the belt cover back on and tighten the screw.

 

Replace the gear

A worn-out gear will cause your miter saw to make a loud noise. Replacing the gear is a vital fix that you must do to solve this problem. Here is how to replace it;

1. Remove the outer flanges, blades, and inner flange, as well as any washers behind the inner flange.
2. Put down the blade guard and remove the gearbox.
3. Take off the ring that holds the shaft together.
4. Once removed, the gear will come off, or you may need to tap it off the shaft.
5. Remove the keyway with the gear.
6. Reinstall the keyway
7. and install the new gear
8. Reinstall the retaining ring on the shaft.
9. Apply new grease.
10. Put in a new gasket, reassemble the saw, and ensure it stays in place.
11. Raise the blade guard and tighten any washers on the shaft, blade, inner flange, and outer flange.

 

Replace the carbon brushes

The commutator sends power to the carbon brushes, which then send it to the armature. Since they are always striking, they will wear down and make a loud noise. You will need to replace it with a new one. Here is how to replace it;

1. Remove the brush cap with a big screwdriver.
2. Take the motor brush out of the brush holder.
3. Repeat this procedure to remove the second motor brush (on the opposite side of the motor).
4. Install the new carbon brush in the brush holder.
5. Align the brush spring’s tabs with the brush holder and compress the brush spring into the brush holder.
6. Secure the new carbon brush with the brush cap (do not overtighten).
7. Repeat this procedure to install the second carbon brush (on the opposite side of the motor).

 

Why is my miter saw making a noise when braking?

Your miter saw is making a noise when braking because of a cracked or broken gear causing the teeth to be out of line. An aging engine or a dull blade is another reason your miter saw makes a noise when braking.

Fortunately, you can replace or repair any worn-out or broken part in a miter saw. However, people don’t notice that their miter saw is excessively loud until something breaks. When this happens, you might not be able to repair the miter saw by just replacing a part; rather, you will need to get a new miter saw.

So, it is essential that you always pay detailed attention to your miter saw when it starts making loud noise or grinding noise.

 

Why is my Dewalt miter saw making a noise?

The reason your Dewalt miter saw is making noise is because of a broken blade or an incorrectly installed blade. Check to see if the blade is broken. If it is broken, replace it with a new one and install it correctly.

A failed bearing is another reason your Dewalt miter saw makes noise. When your Dewalt miter saw’s bearings start to fail, they can make a grinding or squealing noise. In some cases, it can also make a vibration.

 

Here is how to fix it;

1. Unplug the Dewalt miter saw.
2. Remove the two screws holding the field case’s end cap.
3. Remove the end cap.
4. Remove the motor brush caps.
5. Remove the motor brushes.
6. Remove the screws that hold the handle’s top half together.
7. Separate the top half of the handle from the bottom half by lifting it up.
8. Take out the screw that keeps the switch attached to the lower handle.
9. Take off the handle of the armature bearing.
10. Lift the switch
11. Move the switch so the wires can pass through the lower handle assembly without getting stuck.
12. Remove the assembly of the armature.
13. Take out the bearing on the armature.
14. Slide the new bearing onto the shaft of the armature.
15. Find a socket with the same outside diameter as the new bearing’s inner race (and an inner diameter sufficient to accommodate the armature shaft).
16. Put the socket in the middle of the bearing.
17. Align the socket
18. Tap the socket carefully with a rubber mallet to press the bearing onto the armature shaft.
19. Tap the socket
20. repeatedly until the bearing is against the armature’s holding ring.
21. Put the armature back in place.
22. Put the switch back in.
23. Put the top half of the handle back on.
24. Put the motor brushes back on.
25. Put the motor end cap back on.

 

Why is my Ryobi miter saw making a noise?

The reason your Ryobi miter saw is making noise is because the blade is bent or bad. An unpleasant noise will result from a blade bent or warped. Take the blade out of the Ryboi miter saw and place it on a level surface to observe if it is deformed or bent.

Make sure the blade is perfectly level by visually inspecting it from all sides. Feel the area around the blade to make sure it is immobile. If it wobbles when you touch it, it’s deformed and needs a replacement.

Here is how to fix it;

1. Unplug the saw. Don’t try to change the blade while the blender is still plugged in.
2. Use the screwdriver to loosen the cover on the blade bolt.
3. Hold the spindle lock in on the motor with your right hand.
4. Using the wrench that came with your Ryboi saw, turn the blade bolt counterclockwise.
5. Take off the bolt and set the blade washer aside.
6. The old blade can now be taken off easily. Don’t take off the washer inside the blade.
7. Place the new saw blade on the shaft so that the teeth closest to you point down. Then, put the outer blade washer back in place.
8. Put the blade bolt in and start threading it in with your fingers.
9. Once it’s tight enough to hold with your fingers, use the wrench to make it tighter.
10. Move the cover for the blade bolt and the blade guard back into place.
11. Tighten the screw that holds the blade bolt cover with the screwdriver.
12. Check to see if the spindle lock is stuck.
13. Plug your saw in and try it out.

 

Why is my Hitachi miter saw making a noise?

The reason your Hitachi miter saw is making noise is because the brushes are broken or cracked. One of the brushes may be broken, chipped, or worn unevenly, or the brush holder may be burned or fractured.

There will always be some sparking between the brushes and the commutator.

If the noise level or housing temperature is high, you must change the brush. They may look fine, but sometimes you must pull them out to know the problem. Here is how to fix it;

1. Remove the end cap of the motor and move the tension spring to the side.
2. Remove the brushes.
3. If the brush measures more than 1/8 of an inch, it is worn.
4. Install a new brush
5. Reapply the tension springs again
6. Put the motor end cap back on.

 

Why is my Bosch miter saw making a noise?

The reason your Bosch miter saw is making noise is because the drive belt is worn-out or cracked. The drive belt is a part of your Bosch miter saw that requires routine inspection for wear. Whenever the drive belt is worn-out, you need to replace it.

Replacing the drive belt is essential to stop your Bosch miter saw from making noise. Here is how to replace it;

1. Remove the drive belt cover by loosening the two screws.
2. Remove the worn drive belt by cutting it.
3. Before installing the new drive belt, clean both pulleys thoroughly.
4. You should start by installing the new drive belt onto the drive pulley, then pushing it onto the driven pulley as you turn the crank in the clockwise direction.
5. Reinstall the drive belt cover and securely tightens the crews

 

Why is my Makita miter saw making a noise?

The reason your Makita miter saw is making noise is because the saw blade is dull. When the saw blade is dull or cracked, your Makita miter saw will start making noises like grinding or squealing. If this happens, you need to replace your blade to avoid further damage to your Makita miter saw.

Here is how to replace it;

1. Use the hex wrench to loosen the bolt that holds the center cover.
2. Raise the guard and center cover for the blade.
3. Press the shaft lock to lock the spindle, and then use the hex wrench to loosen the hex socket bolt.
4. Then remove the hex socket bolt, outer flange, and blade.
5. Carefully put the blade on the spindle, ensuring that the arrow on the blade and the arrow on the blade case point in the same direction.
6. Install the outer flange and hex socket bolt.
7. Tighten the hex socket bolt counterclockwise using the hex wrench while pressing the shaft lock.
8. Bring the blade guard and center cover back to where they were before.
9. Then tighten the hex bolt in a clockwise direction to keep the center cover in place.
10. Unlock the stopper pin to get the carriage out of the raised
11. Lower the handle to make sure that the blade guard moves properly.
12. Make sure the shaft lock has released the spindle before making a cut

 

Why is my Craftsman miter saw making a noise?

The reason your Craftsman miter saw is making noise is because the gear drive is broken. The is responsible for transmitting power to the shaft. Once the gear is faulty, it will start making noise because it will need more force to transfer power to the shaft.

If your Craftsman miter saw makes noise, you need to replace the gear drive immediately. Here is how to replace it;

1. Remove the outer flanges and any washers that are behind the inner flange.
2. Put down the blade guard and remove the gearbox.
3. Take off the ring that holds the shaft together.
4. Once removed, you need to tap the gear off the shaft.
5. Remove the keyway with the gear.
6. Reinstall the keyway
7. and install the new gear
8. Reinstall the retaining ring on the shaft.
9. Apply new grease.
10. Put in a new gasket, and reassemble your Craftsman miter saw.
11. Replace the outer flanges and any washers that are behind the inner flange.