Question about Makita 9005B 5" Electric Angle Grinder

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Angle grinder eats carbon brushes

I've just gone thru my 3rd makita grinder 9005B in 2 years. am i abusing them? I'm cutting rock (flagstone, ledgestone) with diamond bit blades. They work great then suddenly start eating carbon brushes. Armature damaged by rock dust? Is there a brand or model with enclosed armature? Thanks for your help.

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  • Makita Master
  • 885 Answers

Yes, the rock dust is what's destroying your brushes and armatures. It gets sucked into the rear vent slots and gets to those parts and eats them away quickly. I don't know of any vacuum systems make by Makita but there are some companies that make them for their systems. Blastrac is one that comes to mind but they can be real expensive systems. I don't know of any grinders with sealed brush/armature systems, they have too much heat to disipate. To make your Makita grinders last longer make sure you are cutting with the side of the blade that directs the dust away from the case and try to have a strong airflow blowing the dust away from the grinder to minimize the dust taken in at the back of the grinder.

Posted on Aug 23, 2010

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1 Answer

How can i replacethe carbon brushes on my angle grinder as they are totally and completely worn off


Buy the new brushes from the manufacturer. You already have the old ones out - put the new ones in the same way you took the old ones out.

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It is time to replace the trigger switch.

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If it is the one listed in the header 9005B first unplug the tool and then get a good screwdriver and you will find 2 brush caps that need to be removed and pull the brushes out, Be careful not to crack the brush caps and if you do think about replacing them. Let me know if you need more assistance.

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Need manual for makita angle grinder model 9005 b,also spindle nut wrench.


Go to www.makitatools.com, type 9005 in the search block and you'll get a page where you can get the manual and parts break down in PDF format. The spindle nut wrench is Part #782412-6 and can be bought at most power tool stores or ordered on line at places like ereplacementparts.com.

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OK one of a couple things the brushes night need seated with a stone for this purpose or the armature or field is bad. Remove the brushes and look at the commutator thru the tube and see if there is a bar or 2 that has discoloration or is raised. Let me know if I can help further.

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Unplug tool and then remove the brush caps and brushes, at the front of the tool are 4 screws that need to be removed after removing them you might have to pry the gearcase from the motor housing and then it should just pull out if there is no problems with the field having been hot and melted. Let me know if you need further assistance

Mar 06, 2009 | Makita 9005B 5" Electric Angle Grinder

1 Answer

Something wrong with the armature


If the armature is shot, it will spark a lot where the brushes are touching the armature comutator. To remove the armature:1 Remove brushes. 2 Remove 4 screws holding the gear box. 3 Pull away gear box from the body. The armature may come with the gear box or not, it's only pushed in, so you should have no problem to disassemble it. If the armature stay in the grinder, use two skrew drivers to pray it out. You may not see anythink wrong with it, but it may be no good . That's Makita special, they don't make it good as they used to. The price for new grinder is about $130, for armature $65. field $40

Mar 06, 2009 | Makita 9005B 5" Electric Angle Grinder

1 Answer

Can't get grinder to turn on. Checked brushes, cord, trigger/switch. Any suggestions?


Did you check continuity to the field/brush holders. They have a garter spring that sometimes became overheated and broke. It seems like you have done everything else. Let me know

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