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Motor brushes wear down in about fifteen minutes of use. Saw motor is almost new.

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You have a problem with the armature it sounds like, remove the brushes and look for uneven wear or discoloration on the commutator of the armature. UNPLUG TOOL FIRST. Let me know the model number and brand and I will try and find a breakdown and see what I can do to help

Posted on Nov 17, 2009

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How to repair a Challenge Circular Saw


Brushes are very easy to replace, but it sounds more likely that your motor has burnt out. Try brushes first if you have already ordered them though. There are two types of brush fittings on saws.
1] There should be a couple of small removable caps at the back end of the motor, on opposing sides. Just unscrew them and you should see the brass contact plate of the brush. Hook the brush out, fit the new one and refit the cap. Now repeat on the other side.
2] The vent cover at the back of the motor should be held on with a couple of screw. Remove the screws and the cover. You should see a brush on either side of the motor, probably in some sort of removable holder. Just manoeuvre the holder so that you can slide the brush out and replace with a new one. The brush may be connected with a spade connector or something similar to either the field coil or the brush older.
When you run the machine after this, have a look in the vents at the same end of the motor and you should see slight to moderate sparking. This is normal, especially with new brushes. If you see thicker, brighter sparking from one of the brushes, this indicates that the field coil is breaking down. If the sparking is bright and running around the whole back of the motor, and you are getting a sparking/raspy noise, then I am afraid your armature is breaking down. Either of these faults will cause your brushes to wear very quickly, if the whole motor doesn't completely fail in the process, and I would recommend having the machine checked by a professional repair agent.

Jun 17, 2014 | Saws

1 Answer

Makita Saw Bss610 stopped


It might be that the brushes have got stuck in the brush holders. Take them out and make sure they run free.

Jun 17, 2012 | Makita Saws

1 Answer

Motor began to arc at brushes then blew a fuse, we have replaced the fuse however it blows immediately on start up. We have ordered new brushes and are in the process of changing them, however i am not...


If the motor starts sparking excessively at the brushes, apart from brush wear, the problem is normally a short in the armature windings which is unlikely to be repairable on a small motor.You could try cleaning in between the segments of the commutator with an old tooth brush and then replace the brushes. I have had the same problem with motors and replaced the brushes but have never had any success.

Aug 01, 2011 | Makita (MAK2414NB) 14in Cutoff Saw

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I have a 10'mastercraft table saw with the carbon brush gone,and cannot not find one no place,cannot find a scrap one anywhere could you help


Try this link. If that doesn't work, see if the motor has a manufacturer or model number on it, or if the old brushes have a number stamped on them and use that to search online. Go to google and search "motor brushes" Good luck.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Jun 30, 2011 | Saws

1 Answer

I have an older Craftsman's Table Saw. I use it for a few minutes an then it looses its torque and can't saw no matter the thickness of the wood. Is it the motor?


Is it with belts connecting from motor to blade , or is it direct drive ( like in a circular saw) ? Belts do wear and need to be tightened or replaced. If it is direct drive, is could be the motor contact brushes on the armature that are burned or worn. They will allow the motor to run but not give the power when called for. Brushes are usuall y accessible from the outside of the motor from small plastic (bakelite) screw caps (2 of them). Finallt, it could be the blade lock nut and tension washer. This you will know because the blade will begin to snow and not cut the material, yet the motor sounds as if it is running standard speed.

Nov 27, 2010 | Craftsman 10" Table Saw

1 Answer

I have a Dewalt dw 705 miter saw.when you pull the trigger the saw starts for a second and then shuts off. I have replaced the brushes and it worked for a few minutes and quits. the brushes do not seem to...


the armature needs to be cleaned or it is possibly bad (open bars) They make a special cleaning stick called a commutator stone that you might be able to purchase at a local repair shop. If you are not comfortable trying this I would recommend taking the saw with you, To clean properly you have to remove a cover and have the saw running, I would also check for proper movement in the brush tube allowing the brush to freely contact the armature. Let me know if you need more assistance and I will try and help.

Nov 10, 2009 | Dewalt Saws

1 Answer

Using a Delta 10'' table saw when it sounded like it was binding a bit and then a small amount of smoke started coming out of the motor area. I quickly shut off the saw to look for the problem. I set the...


Hello, the brushes are two gray sprung loaded electrical conductors. They are located on the inner main spindel of the motor (armature), when they start to wear out you will find that most electrical motors will slow down in revolutions. Experience has taught me that when an electrical motor emits smoke it has normally burnded out the armature. This in all honesty is not worth fixing as it is an expensive job, it is cheaper to buy a new saw. Sorry to convey bad news but I hope this clarifies thing for you.

Nov 03, 2009 | Delta Saws

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The saw has stopped I know the circut it is plugged into is live is there a reset button or built in breaker located on the saw? Dw744 10 inch table saw


NO reset or circuit. You can try and unplug tool and blowing into all the exposed areas of the bottom of the saw. WEAR safety goggles. Then what I would do is check the brushes and if you have a volt ohms meter check the continuity to the brush tubes. Start at the cord looking for a break in wiring and go from there. Let me know if you need more help, but I am going to thing brushes or switch

Jun 27, 2009 | Dewalt DW744S 10" Portable Table Saw with...

1 Answer

I have Remington model # 107624-02 electricwhile using It would


I have had a similar problem with a couple Remington electric chain saws, including this one. I removed the motor, opened it up, and found the problem was burned out motor brushes. It can be quite a challenge finding replacements.

MAKE CAREFUL NOTE OF HOW ALL COMPONENTS FIT TOGETHER AS YOU DISSASEMBLE.

I took the motor with me and ended up finding some brushes with the same cross-section at a local electric motor repair place. I tried completely replacing the used brushes before, but always had trouble with either opening and re-closing the brush holder, or with trying to make connections to the existing wiring.

My most effective solution was to file the end of the burned out brush flat (it wears to a curve that fits against the comutator). Then I cut a piece of a new brush with the same cross-section as long as would fit inside the brush holder when inserted from the comutator end to replace the part that had burned/worn away.. I ended up with a piece between 1/4 and 3/8 inch long. This fits flat end to the filed-down flat end of the burned out brush.

Once carefully put back in place and reassembling the motor and saw, I ran the motor with no chain for a minute or so to verify the fix and give the brush a chance to shape itself to the comutator.

This is not necessarily a permanent solution. But I can repeat the process as often as needed until some other component wears out enough to justify replacing the entire unit.

I really like NOT messing with gas engines and do a lot of heavy cutting on logs moved nearer to the house.. But the weak link on every electric I have had has been the brushes eventually burning away.

NthBob@aol.com

Mar 28, 2009 | Remington 16" Electric Chain Saw

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