Question about Milwaukee Tool Factory-Reconditioned Milwaukee 6140-8 4-1/2-Inch Sander/Grinder, 5.5 Amp, 10,000 RPM, 5/8-Inch x 11-Inch Spindle

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Need brushes and on-off switches for milwaukee 6140-6 hand grinders is this grinder obsolete?

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I would need the exact model number and serial number to help but the brush number is 22-18-0710 and there could be a couple different switches. Either give the ser number (the alpha code) or you can go direct to and type in the model number 6140 on the page for the breakdown. it might be easier to let me do it. I worked there for 17 years and if you can't get the alpha code look at the switch and I would need a good description of it

Posted on Feb 21, 2009


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How to replace milwaukee C18ID brushes

That model may be one of those that really isn't meant to be replaced, you can try to do it. I've been the shop maintenance mechanic and have come across some Milwaukee tools grinders that were made to be throw aways! They made them so you could replace the on/off switches but brushes were the real problems with them. They were so short and tiny that they would wear out within a month of constant use. If the brushes didn't go the bearings would melt and the entire case would need to be replaced. The brush assemblies may be available if you order them from Milwaukee directly.

They are not like they old style that would be a piece of brush with a copper braided lead protruding out. Those would just drop into the slots and the spring holds pressure on them. You can find some brushes and shape them yourself as I have done with these newer tools. You'll find the springs are now part of the holder assembly and is a curled piece of spring steel that holds the pressure. So be careful if you try to reuse the assembly with another generic brush set. They will have a special shape also to deter you from using a longer lasting brush by having an offset in the design or a groove which can be flattened. I found the shapes to be like 2 squares that are offset but a rectangular shaped brush will work after its reshaped by a sander or grinder. The Milwaukee brush was 1/4" long new, replaced with 5/8" once the holder was modified, then the bearings just melted, cases melted and the motors rubbed on the windings. But I never had to replace the brushes again. Average life was between 2 weeks to 4 months (new), Hitachi similar grinders lasted 5 or more years with 1 or 2 brush replacements.

Either way you're going to take the tool apart yourself to replace them, just depends on the availability of replacements assemblies. Also the cost, you may as well order 4 sets right away if you are going to use Milwaukee's new garbage sets. 20 years ago I used a similar grinder for 5 years of constant every day use, replaced the cord a few times, never had any other problems.

Now I wouldn't even bother to take them apart, just about every other brand made is equal to or better than Milwaukee and cost 1/2 as much plus they use interchangeable parts. Now you're paying for Milwaukee's redesigning and engineering teams quest to constantly change parts, making sure that you cannot service them using any old parts. Right down to the cords, they spend all their money on developing new ways to do the same thing but making sure it is not compatible with last years models parts. Once your tool is made outside the USA there's no reason to buy any 1 brand, they will all be the same in the end and just dyed a different color and have labels stuck on the cases.

Sep 23, 2014 | Drills

1 Answer

Need switch for milwaukee model no 6066 serial no 0075355593 sander/grinder.please help THANK YOU.

Part # 50

Aug 12, 2013 | Milwaukee Tool Milwaukee 6066 - 6 7''/9''...

1 Answer

Milwaukee 6153-20 grinder is running extremely hot.

Your grinder is either working too hard because of broken or seized bearings or the fan is broken or detached from the armature. Take the brushes out then remove the four screws holding the gear housing on the motor housing. Remove the armature and check the fan and both bearings. If the armature bearings and fan are OK check the bearings and gear teeth in the gear housing.

Jan 31, 2013 | Milwaukee tools Milwaukee Tool 6153-20

1 Answer

I need instuction manual for a Milwaukee sander/grinder

go to and you can download the owners manual, you will need the serial number to ensure that you get the right one. Let me know if you need more assistance

Sep 23, 2011 | Milwaukee 6140 6 4 1/2in. Sander/Grinder

1 Answer

How do I replace the metal grinder?

Replacing the blade is simple. look for the lock button on top of the unit and use a tool or spanner wrench to loosen the blade.
Good luck

Feb 14, 2011 | Milwaukee 6140 6 4 1/2in. Sander/Grinder

1 Answer

Milwakee grinder 6140, heats up runs slow and makes noise

check the commutator bearing and also to see if armature rubbing field. Let me know if you need more help. You can get a breakdown at

Mar 15, 2010 | Milwaukee 6140 6 4 1/2in. Sander/Grinder

1 Answer

No power nothing happens

Milwaukee tools have a 5yr warranty, best thing to do is to take it to a service center. It could be anything from the cord to switch, brushes, field coil etc. If it is newer than 5 yrs, thats the best route.

Feb 06, 2010 | Milwaukee 6140 6 4 1/2in. Sander/Grinder

1 Answer

I cannot get off the abrasive cutoff wheel I put on the grinder

I believe the thread is left hand, but close inspection should verify. Also you should never over tighten cutoff wheels or grinding wheels. You should be able to remove with a gloved hand while holding button on top with the other hand

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1 Answer

Cannot figure how to get the point onto the die grinder.

Here is a link with illustrations on installing grinder points. Scroll about 1/4 of the way down and you'll see two links for "Operators Manual" Click the one that matches your model.

Hope this helps you out.

May 31, 2009 | Milwaukee Tool Milwaukee 5192 4.5 Amp Die...

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