How to Replace Drill Brushes (with diagrams)

Posted in Home Improvement on June 20, 2018

Maybe it's my imagination, but lately my Craftsman cordless drill seems a bit sluggish. It’s seen a lot of use, so I think it’s time to give it a cleaning and replace the brushes.

But how to proceed?

The first step is to remove the battery pack, housing screws and housing.

Use a clean paint brush to sweep dirt from parts. Be careful not to damage fragile wires. (A good cleaning tool for removing dirt from inaccessible spots is compressed air-in-a-can. It's the stuff photographers use for blowing dust off optical parts and is available at photo supply stores. Use short spurts of air for more effective cleaning.)

Before you begin to replace the brushes, familiarize yourself with the layout of the brush assemblies.

Remove the brush wires from the switch. They can be pulled out of the slots easily.

Next, remove the motor housing screws and motor housing. This will reveal the brush holders, which are located on both sides of the drill arbor.

Slide the brush holder out.

Carefully loosen the brush hold-down spring. (Wear protective eyewear, just in case the spring pops loose.) Move the hold-down spring out of the way.

Slide the brush out of the brush holder. The brush and brush wire are one piece.

Insert new brush into brush holder. Make sure the new brush has the brush wire attached. Follow this procedure for the other worn brush. Then, connect brush wires to switch and assemble.