Question about Dewalt D28494N 7" and larger Electric angle grinders

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Sparking bruch the grinder is having ring spark and giving out smoke

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Most likely the carbon brush is worn out and need to be replaced.

Posted on Jan 15, 2009

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Replace capacitor, Yes it would give those symptoms

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Stihl TS400 stone cutter not working (no compression) so replaced piston rings, new gasket kit and clean for carb new spark plug (good spark when engin turned over) cleaned all air filters, replaced all...

You did not indicate whether or not you have compression now that you have changed out the gaskets and piston rings. If not, it seems to me that the problem could be a) cracked head or block, b) bad valve(s) or even c) a warped head.

Sorry for the bad news (if I am right).

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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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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.

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If there is good fuel in the tank and the plug gets wet with fuel, and there is a good spark stating the obvious it should go, if not there could be a mechanical issue, piston scored, rings worn etc,

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It sounds like the armature is shot. When the armature goes bad you will see excess sparking from the brushes.

Jul 04, 2011 | Makita GA9020 Angle Grinder

1 Answer

Grinder is giving out sparks from back and giving burnt smell

Hi there,

Brushes. The brushes have worn down to the contacts or worse, to the springs.

The good news, brushes are inexpensive.

If you are mechanically inclined and comfortable dismantling power tools of medium to high complexity this is something you can do at home.

HOWEVER, if you have even the most minimal reservation, I would recommend bringing it to a shop so an experienced repair person can replace them. For example, if you need instructions on how to re-assemble planetary drive gears, bring it to a shop.

The procedure should be reasonably priced and quickly accomplished.

Best regards

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