Grinder Repair – Replacing Carbon Motor Brushes (Makita Part # CB325)

Grinder Repair – Replacing Carbon Motor Brushes (Makita Part # CB325)

Hi, I’m Mark from
In this video, I’m going to show you how to replace the brushes in a Makita grinder. The brushes rub against the commutator on your grinder’s armature.
They’re responsible for transferring electricity to the spinning armature.
They’re made of carbon, and because of that, they will wear down with normal use. And eventually,
you’ll need to replace them. Replacing the brushes is easy to do, and I’m
going to show you how. Carbon brushes, as well as many other parts,
can be found on our website. Let’s get started.
I’ll begin by removing the side handle and the guard. Now I can remove the rear housing. It’s held in place with a single screw.
Now I’ll pull the brush spring away from the brush. Just pull it off to the side and
let it sit. Now I can remove the brush. I’ll pull the
connection away with a pair of pliers. And pull the brush from the brush holder.
Now I can install the new brush. I’ll slide it into the holder.
And reattach the wire to the brush holder. And I’ll replace the brush spring back on
top of the brush. Now I’ll repeat this process on the other
side. Now I’ll make sure the wires are tucked
out of the way, and reinstall the rear cover. And I’ll finish up by installing the guard.
And the side handle. And that’s how easy it is to replace the
carbon brushes on a Makita grinder. If you found this video helpful, be sure to
give us a thumbs-up. And leave a comment.

39 thoughts on “Grinder Repair – Replacing Carbon Motor Brushes (Makita Part # CB325)

  1. Hi, thanks for the video. I was wondering if there is a special way to put the plastic 2 way switch back on as I pryed it off and I cant seem to get it to go back on how it was before?

  2. Mr. Mark I need help because my hoover wind tunnel's motor brushes wore down and it stopped turning on

  3. Great video
    How do I know is the brushes and something else such as the motor,what is the symptom,does it make noise/

  4. This video helps me in replacing carbon brushes in my unbranded angle grinder with same Makita design but does have inferior quality carbon brushes. Now it's working fine. Thank you very much. Sorry I'm poor, have no donation only sincere THANK YOU VERY MUCH!

  5. Sir: is it necessary to arch the ends of the brushes to match the curvature of the commutator? I am using generic brushes that are square ended. Thanks in advance for a response.

  6. hi, my drill gives sparks at the part where carbons get in contact with the back of the drill motor …What could be the cause of that and how to repair it
    thank so much

  7. If Chicago 7 inch polisher digital screen flashes while turning on by self what to do if it doesnโ€™t light up any more and doesnโ€™t work

  8. You have to remove the Guard and Handle for no reason, but you don't have to make sure it's unplugged? Safety First you Know!!!

  9. It's amazing how many people don't understand mechanics or Electronics you can call me a deer head because I know just about everything will not everything but a lot not academically just physically if that makes sense

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