Thread Number: 39072  /  Tag: Recent Vacuum Cleaners from past 20 years
Dyson DC39 Quandry
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Post# 414679   10/6/2019 at 19:15 (301 days old) by fantomfan57 (Central Texas)        

Howdy folks!
I was given this vacuum this morning telling me the motor needs replacing.

It powered up running low and had an electrical burn smell.

I dismantled the housing and removed the motor.

I found:
the brushes were good looking and had a lot of life to them.
the commutator seemed to have a layer of carbon built up that seemed sludgy. I emery boarded that off.
One of the solder points from the winding to one of the commutator strips was discolored, but the wire was still joined.
The commutator moved smoothly, not evidence of bearing issues.

I cleaned the commutator, stuck in the brushes and reassembled the housing/motor and powered it up.

It ran fine for a short time then started winding down and smelling.

Could there be a problem with the brushes? I wonder if they came in contact with moisture ie. damp filter put in and motor run.

Please let me know what you think.

I could buy brushes and end up having to buy a new/used motor.

Post# 414718 , Reply# 1   10/7/2019 at 19:00 (300 days old) by crazykirbydude (Lexington, KY)        

crazykirbydude's profile picture
Have you checked to armature windings and field coils? Was it rusty inside? It sounds like you just need a whole new motor.

Post# 414721 , Reply# 2   10/7/2019 at 19:36 (300 days old) by huskyvacs (Midwest)        

huskyvacs's profile picture
The problem might be in the armature not supplying enough voltage and its just grinding to a halt and just arcing, and overloading the motor windings which might explain the burning electrical smell.

My ceiling fan in the living room acts like this too, but it is 45 years old. It runs fine on all other settings, but in low speed reverse it will just barely turn and just sit there humming. The motor is getting worn out.

It may have happened on your Dyson, the motor could just be burned out, but the sludgy carbon buildup makes me think water damage. Either was in a flood or someone hosed it out and put it into the vacuum wet and it trickled back into the motor.

Also if it has a circuit board that controls the motor speed, maybe that is malfunctioning?

Post# 414743 , Reply# 3   10/8/2019 at 14:58 (299 days old) by fantomfan57 (Central Texas)        
Armature damaged.....

I am going to switch out the motor and go from there. I attempted to use a Panasonic motor except the motor mounting gasket holes did not match. They are necessary to hold the motor tight in it's casing. I guess it absorbs vibration and torquing.

I see several models share the same Panasonic made motors. I could sacrifice my "engineered" DC18. Supposedly the motors match.

Cheers and thanks all!

Post# 414746 , Reply# 4   10/8/2019 at 17:36 (299 days old) by vacuumdevil (Vacuum Hell )        

vacuumdevil's profile picture
Not to be a negative Nancy. But at least around here there are lots of dc39 for sale for cheap much cheaper than you could replace the motor in one. You might see if you can find one just replace the whole thing.

Good luck to you

Post# 414869 , Reply# 5   10/12/2019 at 13:27 (295 days old) by fantomfan57 (Central Texas)        
2 things SOLVED

Okay, so I was digging in a Dyson Tub and found....a motor. Was harvested from an upright, the model, I don't recall.

After removing the motor mount gaskets, it was identical. Installation was a breeze and testing was successful except the Hepa filter reeked of burnt yuck.

Online, I found an article with pictures which showed how to dismantle this model by Manchester Vac's. In it, they did everything except figure out how to separate the Hepa filter module from the rest of the machine.
After looking at a replacement filter module, I figured it out.
You have to unplug two wires and pull the wires and grommet through a hole. You do this in order to be able to rotate the module and upper unit till the hole and lip line up. It then just pops apart. The link shows everything else.

As for the filter, I was attempting to deodorize it, when I noticed it was damaged. I ripped it out and replaced it with foam material, like some vacuums use. I was about to reassemble everything but stopped because I ordered a new Hepa filter.

Hope this helps.

CLICK HERE TO GO TO fantomfan57's LINK

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Post# 415138 , Reply# 6   10/21/2019 at 14:54 (286 days old) by fantomfan57 (Central Texas)        

New Hepa filter and replacement turbo floor tool. I am done! Did cost me a bit even though I got it for free.

Thanks for letting me bend your ear.

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