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Author Topic: DC40 brushbar motor  (Read 270 times)

Offline john.parsonsja

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DC40 brushbar motor
« on: June 29, 2020, 07:46:41 PM »
Hi,
maybe a stupid question, but if you don't know the answer . . .
The brushbar on my DC40 stopped suddenly. The brushbar seemed jammed so have disassembled, cleaned etc. However once I've stripped it down it seems that the motor itself is jammed, I can't turn it even with pliers on the drive shaft. Is the motor dead, or is it normally impossible to move unless running?

Any help much appreciated

John

Online ryevac

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Re: DC40 brushbar motor
« Reply #1 on: June 30, 2020, 02:40:26 PM »
Hi john

You need to strip the head and try turning the motor shaft sprocket with you fingers, if free it may well be the gearbox assembly that is jammed / u/s. If motor shaft is solid then that's the answer.
The plastic beater bar couplings will be slightly stiff but should be able to turn using fingers.
The only way to fail is not to try.

Offline john.parsonsja

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Re: DC40 brushbar motor
« Reply #2 on: June 30, 2020, 05:15:52 PM »
 :thumbsup:
Thanks. Looks like it's  :dead-dyson:
I might still be under guarantee, now is anybody answering the phone at Dyson?  >:(

John

Offline highlightswitch

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Re: DC40 brushbar motor
« Reply #3 on: June 30, 2020, 11:02:57 PM »
Hi there! I believe have the same issue.

Should the plastic bars that spin the brush bars be able to spin freely when i twist them with my fingers? Currently mine are stuck stiff and click round if i twist them with a wrench.

Is there anything else I can do for it without buying new parts? 60 for a new cleaner head is a bit steep for me at the moment  :boggleeye:

Offline john.parsonsja

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Re: DC40 brushbar motor
« Reply #4 on: July 01, 2020, 01:03:20 AM »
Hi,
in my limited experience it's the motor that dies, it's happened to me twice in 3 years. You can disassemble the brushbar if you have the correct torx screwdrivers (Halfords have them or you can get them off the ManchesterVacs site) If the motor won't turn (as I've learnt) it's  :dead-dyson: Check first you're not still under guarantee, if so they will send you a new complete brushbar replacement FOC. Otherwise ManchesterVacs sell the correct motor for about 30.
Hope you get it fixed!

John

Offline highlightswitch

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Re: DC40 brushbar motor
« Reply #5 on: July 01, 2020, 02:01:16 AM »
After diving further into the motor, I took the drive belt off to allow the brush bars to spin free of the motor. I'll test it tomorrow and see whether it does any better at picking up dirt. If not, I might go for that 30 motor!  :)

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Re: DC40 brushbar motor
« Reply #6 on: July 01, 2020, 02:27:20 PM »
Strip the item first if thinking of changing the motor. There are two types of cleaner head, and two types of motor.

Also, make sure the motor has a 300DC feed with a meter first. There is a known power supply issue with the DC40. Also, a kaput motor may also have a kaput PCB so checking the power supply is essential.

Offline TWilson

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Re: DC40 brushbar motor
« Reply #7 on: July 03, 2020, 12:19:26 AM »
Hi there, new to the forum but I've worked on a few Dysons before normally with success but struggling this time. Recently been refurbishing a DC40 (ERP) (purple brush bar with red slider). Main motor is fine, I diagnosed a dead brushbar motor, stripped it down, removed the old motor which smells burnt out, looking inside it looks damaged and has zero resistance across the terminals and I found a stiff bearing in the brushbar which may explain it burning out. So ordered a replacement OEM Johnson DC771(2)XLLG. Fitted it and nothing happened. Tested the output and its reads 330v DC at both the socket and at the end of pink and white wires, which from reading this forum sounds correct? So it doesn't' seem to be the loom issue. So I was convinced the new motor was DoA so got hold of another one. Exactly the same. Two brand new motors don't do anything despite having supply. I'm stuck for ideas. Any suggestions?

The only other thing i noticed is that the brush-bar override switch next to the main power button doesn't appear to do anything. The DC supply to the socket continues when you depress this. It may be faulty but if the motor is getting supply it appears to be stuck on rather than stuck off.

Slightly confused that the motors are all marked 240v DC and the output is over 300 but it sounds like this is how it's meant to be.

Offline TWilson

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Re: DC40 brushbar motor
« Reply #8 on: July 03, 2020, 11:43:20 AM »
Reading further, this thread https://manchestervacs.co.uk/DysonForum/index.php/topic,4124.0.html sounds like a similar issue. Guess I'll try a different PCB. Is it possible that due to a faulty or blown PCB that the vac outputs the DC load but as soon as any load is applied it drops to zero?


Online ryevac

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Re: DC40 brushbar motor
« Reply #9 on: July 03, 2020, 12:21:44 PM »
That is possible i think, best method is to  - as you already have measure the voltage with no head connected to confirm brushroll motor supply present, then try it with brush roll connected BUT monitor voltage over the motor contacts.

If voltage vanishes then i would presume erp pcb is at fault too, i haven't worked on erp much tbh.

Without me digging deeper, investigating... are you 100% certain the motors are correct - if so it is probably pcb.


The only way to fail is not to try.

Offline TWilson

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Re: DC40 brushbar motor
« Reply #10 on: July 03, 2020, 01:20:12 PM »
Thanks Ryevac,

I 'think' it's correct, new one on left, old one on right. The main product code matches. I presumed the other codes (which differ) were batch codes.

ila_rendered

Offline TWilson

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Re: DC40 brushbar motor
« Reply #11 on: July 03, 2020, 11:13:23 PM »


So, think we may have found the issue...

Online ryevac

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Re: DC40 brushbar motor
« Reply #12 on: July 04, 2020, 03:14:04 AM »
Oh dear, i do have those Q1 components and cannot remember what value the resistor is now without looking at a board.
you will have to find a replacement board or attempt to repair that one, Q1 is easy enough to remove with a hot air rework station, the resistor too could be replaced but my worry would be finding that other surface mount components have failed.

Not the components that costs tbh, for me it's the labour cost.
The only way to fail is not to try.

Online ryevac

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Re: DC40 brushbar motor
« Reply #13 on: July 04, 2020, 03:17:02 AM »
Actually it may just be R1 that has failed, if so it's a cheap fix.

I don't have the board to hand to tell you it's value, i will have a look tomorrow (sat ) for it.
The only way to fail is not to try.

Offline TWilson

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Re: DC40 brushbar motor
« Reply #14 on: July 05, 2020, 01:40:15 PM »
Thanks Ryevac, I've ordered a replacement board

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