Power is conducted to your Milwaukee hammer drill motor through carbon brushes. After months or years of use, these brushes will begin to wear down and need to be replaced. Some symptoms that indicate your brushes need to be replaced include intermittent starting, failure to start or excessive sparking when running. On some tools, these brushes can be hard to access but Milwaukee made it simple to access motor brushes by putting them under removable caps near the rear of the tool.
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Things you need
- Replacement carbon brushes
Disconnect power to your hammer drill by unplugging it if it's an electric model or removing the battery if it's a cordless model.
Locate the brush caps near the near of the hammer drill. There should be one on each side of the drill. Insert a screwdriver into the slot on one cap and turn counterclockwise. Keep turning until you can remove it completely.
Pull out the old carbon brush from the slot. Make note of how the brush is oriented into the slot. The new one needs to be installed in the exact same direction.
Slide the new carbon brush into the slot. Hold it in and place the cap back on. Tighten the cap back into place by turning it clockwise with your screwdriver.
Repeat the above process for the other carbon brush located on the other side of the drill.
Tips and warnings
- Replace both brushes at the same time. Replacing one brush at a time can cause the motor to wear unevenly, which may lead to premature failure.
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