My skill hd 77 shows a lot of sparks coming from the commutator. I replaced the brushes and it is the same. I tested the armature, and it tests good. What else could it be?

Question 1

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1answer

Skillsaw throws sparks when on

Often a collapsed brush spring will cause this - remove the brush caps and inspect the brushes - if the brushes are short >1/4" or the springs are broken or weak you can try just replacing the brushes. With the brushes out you can use a flashlight and look through the tube to inspect the armature. The copper commutator should not look scarred or burnt - if it is you most likely will need an armature.

Jun 23, 2014 • Skil 7 1/4" Magnesium "Mag 77" Wormdrive...

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Sparking carbon brush hr5001c

Brushes can have very small, blue sparks coming off them and be OK. If it's bad enough that you can hear, smell or see excessive sparking it can be caused by: a) The brushes are worn down or the springs are collapsed and the brushes are not making good contact with the armature. b) The armature contact (commutator) is damaged or there is a short in the armature windings. Replace the brushes or armature as needed. I can't give part numbers as your problem is listed in cut-off saws and grinders but your model number is for a rotary hammer.

Nov 27, 2013 • Makita Saws

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1answer

Why to much sparks in the brushes

Low power and lots of sparks from the brushes is usually indicative of a damaged commutator (the ring where the brushes contact the armature) or burnt or broken windings on the armature. The only fix for either of these problems is to replace the armature.

Apr 28, 2012 • Clarke Power Products 7 in 9 in Angle...

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1answer

New carbon replaced produces too much sparks making it hot

Either your new brushes don't meet up with the armature properly or the commutator is damaged. Brushes usually 'wear in' within the first couple minutes of running. If it's getting excessivly hot you most likely have bad armature contacts and need to at least resurface the commutator or replace the armature.

Nov 24, 2011 • Makita 9553NB 4" Angle Grinder

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2answers

Skill Wormdrive HD77 saw sparks are coming off the brushes

you have a problem with worn brushes or the armature might be failing. UNPLUG the tool and remove the brushes to check their condition length and look at the face of the brush for any unusual wear. Then look into the brush tubes themselves and slowly rotate the armature for discoloration/raised commutator bars.

Jun 23, 2011 • Skil Circular Saw 7 14" HD77 Worm Drive

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2answers

My jigsaw stopped running. Judging from the sparks coming from around the armiture, my guess is the trouble has to do with brushes or worn armiture. The saw is not an expensive one so perhaps it's not...

Many times I clean the commutator with light sand paper and she come back to life. Take a brush out and sand the end off to clean it. Then fold a small piece of sand paper and push it down in the hole where the brush goes and rotate the motor by hand and clean the comm off. Good as new!

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Sep 15, 2009 • Saws

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Just replaced the brushes on a WE14 150 Quick 6 Grinder and sparks now come from the brushes

From my own experience.

Are the strips of the commutator smooth and flat?
(Not to insult you. The part of the armature that the brushes ride on)

If they aren't, the brushes will bounce up and down.
I put one end of the armature in a drill, and have a helper run the drill. The other end of the armature rests in the front bearing of the grinder head, which is fastened down. (To a bench) Then I use a medium tooth, (B astard) file to dress the commutator bars flat.

I also put medium grade sandpaper in-between the brushes, and the commutator surface to dress an arc on the brushes. (Turn the armature by hand while keeping the sandpaper in place)
Brushes come with a flat surface. Putting a radius on them to fit the arc of the commutator, gives them a good contact surface to start from.

Be sure the springs are putting pressure on the brushes. Sometimes the brush mounts need to be cleaned, or the brush will not slide through the mount like it should. The brush will again, 'Dance' on the commutator. (Bounce up and down)

Sep 06, 2009 • Metabo WE14-150 Quick Angle Grinder

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2answers

What would cause the brushes to go so fast?

Yes, the bars on armature comutator are lifting, usually caused by heat. Only thing to do is replace armature and brushes, but best to also have field coil tested for shorts before buying new armature.

Jul 09, 2009 • Dewalt DW744S 10" Portable Table Saw with...

1helpful

2answers

Sparks from the Kirby Motor

1. Do you think this may be the problem?
YES

2. How come it continues to rotate?
Motor armature consists of multiple coils and just some of them burned so even though it keeps spinning it does not function properly.

3. Do I need to replace the armature?
We have switch replacement instructions HERE and they will take you as far as accessing the motor. We do not have motor assembly instructions yet but if you get that far - motor is not that hard to reassemble. You may have to spend some time getting tolerance ring back in and make sure you install finger spring properly.

Good Luck

Dec 28, 2008 • Kirby Ultimate G Bagged Upright Vacuum

8helpful

3answers

My Dewalt chopsaw is loosing power and sparks heavy in brushes

I worked at a tool rental center while attending college and learned to repair tools such as yours. Damage to the armature occurs mostly during low power situations or overloading the motor. The damage is usually visable. Notice burned looking copper windings or commutator bars. You can test with growler or meter. We would turn the commutator on an armature lathe to true the surface of the bars. If the commutator is not perfectly round the brushes will bounce thus cause the sparking that you see. Also you must clean the groves between the bars with a blade to clean out all metal filings that can cause short between bars. (Broken hacksaw blade ground to fit the groves will work fine)Sanding with sandpaper may not be perfect enough to stop sparking assuming the armature is not shorted. Moisture will not effect the brushes, and sanding them square is ok but you can put the curve back by cutting fine sandpaper into strip and wraping it around commutator and insert brush into holder against sandpaper. Not necessary thou because all new brushes are square. New brushes however will increase the tension of the brush against the commutator preventing bounce due to new spring and longer carbon. Good luck enjoy

Dec 15, 2008 • Dewalt Chop Saw D28700

Question 2

Kenneth Walker

Expert 293 Answers
Posted on May 12, 2019

Kenneth Walker

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If it hasn't been used for a while, the contacts on the armature may have oxidized. Use a pencil eraser or 1000 grit emery cloth to make the area where the brushes contact the armature SHINY. If the armature rotor contacts are shiny and it still sparks, make sure that all of the windings measure the same. Excessive sparking is a sign the armature is going

Kaoru Ito May 13, 2019

You are correct. Even though the armature tested good, I replaced it and the saw works perfectly now. Thank you.
Kenneth Walker May 13, 2019

Thanks, I tried to answer the day of your post, but the 'internet gods' or fixya would not accept my answer. Ken

×

Answer 2 · 4/21/2008 12:00:00 AM

Marci Marple

357 Answers
Posted on Apr 21, 2008

SOURCE: Good armature maybe needs new brushes

Hello,
Carbon brushes wear over time and may need completely replaced...it doesn't cost a lot and i have guides available for the repair. Try my troubleshooting guide....

http://reviews.ebay.com/COMMON-PROBLEMS-WITH-THE-KIRBY-VACUUM-TROUBLESHOOTING_W0QQugidZ10000000003800312

I have the brushes available as well. The changing process is also outlined in my guide for changing the power switch.

http://reviews.ebay.com/REPLACING-THE-POWER-SWITCH-ON-ANY-KIRBY-G-SERIES-VACUUM_W0QQugidZ10000000003752018

Hope this helps...
Marci

Rocky

324 Answers
Posted on Jan 06, 2009

SOURCE: Sparks from the Kirby Motor

1. Do you think this may be the problem?
YES

2. How come it continues to rotate?
Motor armature consists of multiple coils and just some of them burned so even though it keeps spinning it does not function properly.

3. Do I need to replace the armature?
We have switch replacement instructions HERE and they will take you as far as accessing the motor. We do not have motor assembly instructions yet but if you get that far - motor is not that hard to reassemble. You may have to spend some time getting tolerance ring back in and make sure you install finger spring properly.

Good Luck

Anonymous

154 Answers
Posted on Jun 11, 2009

SOURCE: Exesive sparks on the brushes (Bosch GSB 16RE drill)

If you used the drill any amount with a burned field coil there is a good chance that is has burned the new armature out.

Steve Allison

5569 Answers
Posted on Nov 02, 2009

SOURCE: replaced armature and brush's and there is alot of

Unless somewhat preformed, brushes have a tendency to arc like crazy and can produce heat and even smoke. I would remove the brushes and use a fine 'keyhole' type file to give them a little inside curve so they have better contact to start with.

Anonymous

2176 Answers
Posted on Jun 24, 2011

SOURCE: Skill Wormdrive HD77 saw sparks

you have a problem with worn brushes or the armature might be failing. UNPLUG the tool and remove the brushes to check their condition length and look at the face of the brush for any unusual wear. Then look into the brush tubes themselves and slowly rotate the armature for discoloration/raised commutator bars.

Answer 3 · 4/21/2008 12:00:00 AM

Marci Marple

357 Answers
Posted on Apr 21, 2008

SOURCE: Good armature maybe needs new brushes

Hello,
Carbon brushes wear over time and may need completely replaced...it doesn't cost a lot and i have guides available for the repair. Try my troubleshooting guide....

http://reviews.ebay.com/COMMON-PROBLEMS-WITH-THE-KIRBY-VACUUM-TROUBLESHOOTING_W0QQugidZ10000000003800312

I have the brushes available as well. The changing process is also outlined in my guide for changing the power switch.

http://reviews.ebay.com/REPLACING-THE-POWER-SWITCH-ON-ANY-KIRBY-G-SERIES-VACUUM_W0QQugidZ10000000003752018

Hope this helps...
Marci

Answer 4 · 1/6/2009 12:00:00 AM

Rocky

324 Answers
Posted on Jan 06, 2009

SOURCE: Sparks from the Kirby Motor

1. Do you think this may be the problem?
YES

2. How come it continues to rotate?
Motor armature consists of multiple coils and just some of them burned so even though it keeps spinning it does not function properly.

3. Do I need to replace the armature?
We have switch replacement instructions HERE and they will take you as far as accessing the motor. We do not have motor assembly instructions yet but if you get that far - motor is not that hard to reassemble. You may have to spend some time getting tolerance ring back in and make sure you install finger spring properly.

Good Luck

Answer 5 · 6/11/2009 12:00:00 AM

Anonymous

154 Answers
Posted on Jun 11, 2009

SOURCE: Exesive sparks on the brushes (Bosch GSB 16RE drill)

If you used the drill any amount with a burned field coil there is a good chance that is has burned the new armature out.

Answer 6 · 11/2/2009 12:00:00 AM

Steve Allison

5569 Answers
Posted on Nov 02, 2009

SOURCE: replaced armature and brush's and there is alot of

Unless somewhat preformed, brushes have a tendency to arc like crazy and can produce heat and even smoke. I would remove the brushes and use a fine 'keyhole' type file to give them a little inside curve so they have better contact to start with.

Answer 7 · 6/24/2011 12:00:00 AM

Anonymous

2176 Answers
Posted on Jun 24, 2011

SOURCE: Skill Wormdrive HD77 saw sparks

you have a problem with worn brushes or the armature might be failing. UNPLUG the tool and remove the brushes to check their condition length and look at the face of the brush for any unusual wear. Then look into the brush tubes themselves and slowly rotate the armature for discoloration/raised commutator bars.

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Trustworthy Expert Solutions

My skill hd 77 shows a lot of sparks coming from the commutator. I replaced the brushes and it is the same. I tested the armature, and it tests good. What else could it be?

1 Answer

Kenneth Walker

5 Related Answers

Marci Marple

Rocky

Anonymous

Steve Allison

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

Skillsaw throws sparks when on

Sparking carbon brush hr5001c

Why to much sparks in the brushes

New carbon replaced produces too much sparks making it hot

Skill Wormdrive HD77 saw sparks are coming off the brushes

My jigsaw stopped running. Judging from the sparks coming from around the armiture, my guess is the trouble has to do with brushes or worn armiture. The saw is not an expensive one so perhaps it's not...

Just replaced the brushes on a WE14 150 Quick 6 Grinder and sparks now come from the brushes

What would cause the brushes to go so fast?

Sparks from the Kirby Motor

My Dewalt chopsaw is loosing power and sparks heavy in brushes

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Skillsaw throws sparks when on

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Trustworthy Expert Solutions

My skill hd 77 shows a lot of sparks coming from the commutator. I replaced the brushes and it is the same. I tested the armature, and it tests good. What else could it be?

1 Answer

Kenneth Walker

5 Related Answers

Marci Marple

Rocky

Anonymous

Steve Allison

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

Skillsaw throws sparks when on

Sparking carbon brush hr5001c

Why to much sparks in the brushes

New carbon replaced produces too much sparks making it hot

Skill Wormdrive HD77 saw sparks are coming off the brushes

My jigsaw stopped running. Judging from the sparks coming from around the armiture, my guess is the trouble has to do with brushes or worn armiture. The saw is not an expensive one so perhaps it's not...

Just replaced the brushes on a WE14 150 Quick 6 Grinder and sparks now come from the brushes

What would cause the brushes to go so fast?

Sparks from the Kirby Motor

My Dewalt chopsaw is loosing power and sparks heavy in brushes

Not finding what you are looking for?

Saws

Skillsaw throws sparks when on

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