Ryobi Orbital sander lacking power- replace brushes?

5 years 1 month ago #3351 by famreeks
Ryobi Orbital sander lacking power- replace brushes? was created by famreeks
HI, I think it has done too much work for a little guy. EMS 250VK model
Would replacing the brushes fix the issue or is it a whole new armature etc??

Thanks

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5 years 1 month ago #3354 by MTR-Admin
Replied by MTR-Admin on topic Ryobi Orbital sander lacking power- replace brushes?
Unless the brushes are simply worn down with no arcing on either the brushes or the commutator portion of the armature, typically you would need to replace both armature and field plus the brushes which usually costs more than a new unit.

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5 years 4 weeks ago #3364 by famreeks
Replied by famreeks on topic Ryobi Orbital sander lacking power- replace brushes?
Thanks Admin. So the armature and field will costs about $50. What do each look like? Is the Armature where all the copper wiring is?

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5 years 4 weeks ago #3365 by famreeks
Replied by famreeks on topic Ryobi Orbital sander lacking power- replace brushes?
drive.google.com/file/d/1Asb56Z75b9Ys7hZ...6Je/view?usp=sharing

This is the armature I believe. Are these cracks and dishes normal in the body?

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5 years 3 weeks ago #3367 by harleydude
Replied by harleydude on topic Ryobi Orbital sander lacking power- replace brushes?
The armature is what rotates, that the brushes ride on.
The field is a winding of wire that creates the electro magnetic field that causes the armature to spin.
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5 years 3 weeks ago #3368 by harleydude
Replied by harleydude on topic Ryobi Orbital sander lacking power- replace brushes?
Those cuts are to balance the armature as it spins. The spaces on each commutator section should be equal to the next. If one is wider or very dark, this could be a short in that section of the armature. The only way to test is to place it on a "growler", which most motor shops have.
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