Thread Number: 36640  /  Tag: Recent Vacuum Cleaners from past 20 years
Kirby G4 Armature
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Post# 392213   5/22/2018 at 20:09 by Repairman (Stickney, IL)        

I have a Kirby G4 where the brushes are slightly arcing and I wanted to know if I need a new armature because there is a ring worn into the commutator. If I run my finger across, I donít feel a groove or cut and itís all a smooth surface. So is the armature toast, or do I need to get new carbon brushes and seat them with a stone? If you look in the 3rd picture, you can get a better visual of the ring.

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Post# 392222 , Reply# 1   5/22/2018 at 23:39 by Lesinutah (Utah)        

lesinutah's profile picture
Notice where the wear is on commuter. It's where carbon brushes hit it. It looks good to me.

Post# 392223 , Reply# 2   5/23/2018 at 00:43 by tolivac (Greenville,NC)        

Looiks pretty normal.

Post# 392249 , Reply# 3   5/23/2018 at 11:44 by Repairman (Stickney, IL)        

I am aware of where the brushes hit the commutator. I just want to know if the small line in the middle of the middle mark is a sign of death as seen in the third picture.

Post# 392252 , Reply# 4   5/23/2018 at 12:56 by broomvac (N/A)        

broomvac's profile picture
Looks great to meóand yes, I see the ring you speak of. If that were my vacuum, I would not be concerned. In fact, it looks cleaner than a number of (also good) armatures I have come across.

But, just to play the devilís advocate, letís say the armature is actually damaged. Whatís the worst that could happen? One day it would just quit working and at that point you would have to get a new armature anyways. Using it until it fails shouldnít cause any collateral damage. You would simply get a few more miles out of the original armature.

Nevertheless, I donít think you will ever see that armature fail and you will able to save yourself some cash by not getting a new one. :)

Post# 392261 , Reply# 5   5/23/2018 at 15:52 by dysonman1 (Missouri)        

dysonman1's profile picture
The armature looks fine. Try to avoid prolonged use on HI speed (hose use), and you'll be fine.

Post# 392265 , Reply# 6   5/23/2018 at 16:13 by panasonicvac (Northern Utah)        

panasonicvac's profile picture
They look fine. One thing that you could do if you want to, there's some motor armature cleaning stones that you can do if you want the armature to look nice but I can't promise that the black rings would go away completely.

Post# 392304 , Reply# 7   5/24/2018 at 23:43 by MadMan (Chicago, IL, USA)        

madman's profile picture
Maybe just wipe the commutator the whole way 'round with a little alcohol - just to make sure it's not oily. Otherwise... looks great to me.

Post# 392586 , Reply# 8   5/31/2018 at 15:41 by huskyvacs (Northern Indiana)        

huskyvacs's profile picture
The ring you describe is actually just the copper being stained from years of carbon buildup, that is normal. There will be more wear in the middle because that is where the brushes are pressed against the armature at their strongest. Both the armature and brushes still look new, like its been barely broken in.

Some arcing is normal, it's where it becomes a huge arc that envelops the motor and starts melting wires that can be an issue.

This is what would be an example of a bad arcing and a bad armature, where it is actually chasing the armature all the way around and is throwing sparks out of the fan housing:

Your armature can use a little bit of polishing up if you want, I followed this video:

Post# 392595 , Reply# 9   5/31/2018 at 19:53 by texaskirbyguy (Plano, TX)        

Some very fine sandpaper (like 800 or higher) can clean it up but as it is, it looks fine. If very little arcing, I would not even worry about it. Even after the brushes wear a visible groove into the commutator, it can still be used. Those bars are pretty thick. That one you show still has lots of life in it.

Post# 392646 , Reply# 10   6/1/2018 at 17:03 by bikerray (Middle Earth)        

bikerray's profile picture
If it's just some sparking along the edge of the brush that's normal. If the discoloration bothers you then clean it up with a seating stone. Just be careful using the stone, you want to clean it up not grind it down to nothing.

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