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Author Topic: Motors: new or used?  (Read 1558 times)

Offline dysondestijl

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Motors: new or used?
« on: August 18, 2020, 08:40:01 PM »
Really not sure where to put this as it refers to all machines not just certain models.
But what are peopleís views on second hand motors?
Iíve often been in conflict with myself over this. Picture the scenario: If I have a machine in for repair or resale; say for instance a 10 year old DC14. You know that said machine has had ten years worth of use. The motor will be worn. If the motor still has decent brush length, and a nice clean armature, would you feel confident re-fitting the same motor? Do you offer a warranty on said motor? What constitutes suitable remaining length on the carbons? Or do you fit a new one knowing the old, although working, motor has had ten years worth of use?
Just curious as to what others do. Suggestions welcome!
Iíve often checked over the existing motor and re-fitted if suitable, and touch wood has ever been an issue, but at the same time I have seen motors that seemingly look ok however have still failed for one reason or another.
What do you do?

Offline Dysonboy

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Re: Motors: new or used?
« Reply #1 on: August 19, 2020, 01:26:15 AM »
I always test the motor first before stripdown. If it seems to run ok i.e. no sparking when running (a little at startup is normal) and no unusual noise ill assume for the moment its ok and put it to the side.

When it comes to the stripdown, once I've attended to the rest of the Dyson i'll take a proper look at the motor. If the commutator looks quite worn or very black ill just chuck it and sticka new motor in, they are cheap enough anyways.

If the commutator looks ok, not too worn and not too black, ill clean it up a bit, check brushes length and usually I stick some new brushes in, then rebuild and test motor again.

With post filter cover off, looking for no sparking when running, no unusual sounds, no smells and leave it running for a while to get it 'up to temp' (warm it up basically and test when hot as itll warm up in normal use) and leave it running to just make sure it runs sound and bed the new brushes in.

Done it this way for a few years and never had an issue, if motor does seem on its last legs by getting too hot, sparking, commutator looks worn or is very black, smells a bit 'hot' or 'electrical' or is making unusual sounds, or was already blown when I got it, i'll just replace with a Quаltex.

As I say, I haven't had an issue doing it this way. *Yet* there will always be once or twice something does fail prematurely on a customer even if tested totally brilliant at first.

Warranty wise, I don't mind if in the first few months someone comes back and says its blown up, Ill sort them out. I had a good mate the once I sold a DC07 to, motor failed 6 months later, he messaged me asking how much itll be so I said ill just drop a new motor in as it hadn't lasted as long as it should have.
Collector and restorer of most vacuum cleaners including vintage, older style models and newer models. Seller of refurbished vacuums and vacuum parts Livin' every day, as if it were the last!

Offline ryevac

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Re: Motors: new or used?
« Reply #2 on: August 19, 2020, 01:31:54 PM »
bearings i find can be as much an issue as the electrical side.

If i didn't want to visit that customer again then fit a new motor.
The only way to fail is not to try.

Offline MVacs

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Re: Motors: new or used?
« Reply #3 on: August 19, 2020, 01:46:55 PM »
We always fit new motors on DC33s. For some reason, even ostensibly healthy motors never seem to last long.

Good tested motors OK in 04, 07 and 14.

Offline dysondestijl

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Re: Motors: new or used?
« Reply #4 on: August 20, 2020, 10:49:25 PM »
Thankyou for all assistance guys. It is helpful!

Offline Dysonboy

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Re: Motors: new or used?
« Reply #5 on: August 23, 2020, 03:03:45 AM »
We always fit new motors on DC33s. For some reason, even ostensibly healthy motors never seem to last long.

Good tested motors OK in 04, 07 and 14.

I had a DC33, commutator was black and burnt to a crisp, brushes were basically non existant and were brittle as anything from being scortched, and the fan retaining nut had come off along with the fan!
Collector and restorer of most vacuum cleaners including vintage, older style models and newer models. Seller of refurbished vacuums and vacuum parts Livin' every day, as if it were the last!

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