How to Replace the Armature on a Dremel 395 Moto Tool
Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)
The armature is the main portion of the motor in your Dremel 395 Moto-Tool. You'll need to replace the armature if you notice smoke or sparks coming from the vents on the back of your tool. If this happens, you've probably overloaded your armature and some point, which caused the insulation to break down. If you see sparks or smoke, do not use your tool again until you perform an armature repair.
Remember to find the exact armature for your Dremel tool by visiting our Dremel spare parts page.
Removing the Armature
1. Remove the front cap
Begin the repair by unscrewing the cap at the front of your tool.
2. Remove the brushes
Use a flat-head screwdriver to remove the two brushes from the side of the tool.
3. Remove the housing screws
Now unscrew the four screw that secure the two housings.
4. Remove the motor and switch assembly
Now you can pull the motor and switch assembly away from your tool.
The armature is nestled inside the black field.
5. Remove the armature
Slide the armature out of the field. You should be able to just pull it away from the tool.
6. Transfer the collett and bit
Your old armature includes the attachment shaft. Unscrew the collett and bit from the old armature and transfer it to the end of the new one.
Installing the Armature
1. Combine the motor assembly parts
Slide the armature back into the motor field.
2. Re-install the lock pin and spring
When you broke down the multi-tool, chances are a small lock pin and spring fell out.
They nestle right into the housing. Put them in place.
3. Re-install the armature
Now set the armature back into place in the housing.
Check the bearings and make sure they line up in the housing.
4. Route the wires
Route the wires in the casing so they won't get pinched when you combine the two halves later.
5. Secure the housings
Now you can set the other half of the housing back into place and fasten the screws.
6. Secure the brushes
Use your flat-head screwdriver to re-install the two brushes.
7. Re-install the front cap
And now you can secure the front cap to finalize the repair.
Conclusion
And that's how simple it is to replace the armature in your Dremel tool. This repair will save you loads of time and money compared to a repair shop, and you'll learn a bit about how your tool works, too!
Remember, you can find all the spare parts you need for your power tool repairs here.