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DeWalt DCS577 Flexvolt Worm Drive Saw: How To Replace Rotor Assembly/ Armature (Part # N556108)

Updated: Jan 7, 2019

To order parts used in this video, visit

mmToolParts shows you how to replace the rotor assembly, or armature, on your DCS577 cordless worm drive saw. Is your saw experiencing intermittent or decreased power? Is your saw not powering on? We'll help you diagnose the problem and then show you how to replace the armature.

The first step will be to remove the carry handle and housing:

Inside you'll see the power supply components and battery cage:

Remove the battery cage and plastic clip:

Remove motor field by prying up with a flat head screwdriver:

Now you can see the rotor assembly, or armature (Part # N556108):

To remove this just pull it up. It may be stuck in there tight:

For more detailed information on this process, watch the video we made!

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