1/2 inch makita drill , model # 6013BR . Problem ;;;; great deal of arcing and smoke from vicinity of brushes. Would like to attempt my own repairs but am unable to remove the motor because I can't figure out how to split the case apart ; or ; is there another method to remove the motor . Thanks for any help you may offer ! VIC

The brushes are probably wearing out. They can also smoke if they get dirt or something on them. You can take the drill apart and replace the brushes, but if they are just burned some, take some fine sand paper or emery cloth and polish the armature where they run and clean the brushes and reinstall.

It could be that your brushes (PN CB440) are worn down so much that they can't make full contact with the armature or the armature (PN 619247-1) has a short in it causing excessive arcing. This would be evident by excessive burning or pitting on the commutator where the brushes make contact or missing sections of the commutator..

buy the whole thing makita.com, ereplacementparts.com, or toolpartsdirect.com

Check the brushes: they should be over 1/4" long, the springs should be intact and pushing the brushes into the armature and they should slide easily in the brush holder. Using a volt meter, check that you are getting full power to the switch. Next check that power is getting through the switch when the swtich is held on. If all of these check out you may have shorted or burnt windnigs on the armature or field.

did you also cut the mica between the comm bars? If yes and still arcing I would take a reading across all the bars with a VOM or better a growler and I think that you might have one that is bad. I guess that you also replaced the brushes and they are not sticking. Also check the field for resistance across both sides and they should be about the same, any major variance would indicate the field is bad. Let me know if you need more assistance.

Check carbon brushes and ball bearings.

I solved it in my clarification request.

I used to pull these drills to bits for a living and all i can say is that if the brushes are intact and not too worn then it should run fine without cleaning the brushes. chances are that the motor has worn out.

The most popular size is 3/8 inch, which means it accommodates a 3/8-inch diameter bit. Smaller ¼-inch drills are less expensive, but more limited. Heavy duty jobs might require a ½-inch model.

possible burnt out in the brush holder assy,checked the motor