The World's #1 Vacuum Cleaner Advice, Repair, Discussion & Information Forum

Author Topic: DC39 need exploded view and info for motor bypass valve  (Read 1966 times)

Offline sofasurfer

  • Member
  • Posts: 2
DC39 need exploded view and info for motor bypass valve
« on: September 27, 2020, 03:20:17 am »
DC39. I have the same issue as people in the follow 2 threads....loss of suction and popping noise caused by the motor bypass valve.,3495.msg28860/highlight,dc39.html#msg28860,4198.msg33073/highlight,dc39.html#msg33073

I have eliminated the possibility of blockages back to the motor. I was thinking maybe the hepa filter was plugged but not I read that this is never the problem. Thats as far as I have gotten and I have not seen anything that resembles a bypass valve. Although I have disassembled back to the hepa filter I have not taken the hepa filter out as I can't figure out how. I see that there are 2 white tabs but they do not move.

Can anyone supply me with a exploded view that shows the valve and offer mt any other help?


Offline MVacs

  • Administrator
  • Member
  • *****
  • Posts: 6383
  • Country: gb
  • Gender: Male
    • Manchester Vacs - The Independent Dyson Specialists
Re: DC39 need exploded view and info for motor bypass valve
« Reply #1 on: September 28, 2020, 10:25:23 pm »
I’m not aware anybody has detailed and photographed the process of stripping that down.

I know we have one or two in the workshop that need it doing from time to time. It doesn’t seem to take very long or cause any problems, so it can’t be terribly complex. They are usually only a spring and a seal that gets muck trapped in them.

Removing the HEPA filter is something that is covered in several topics here. Search CRU, I seem to recall some guy used that term and put quite a detailed explanation.

Offline sofasurfer

  • Member
  • Posts: 2
Re: DC39 need exploded view and info for motor bypass valve
« Reply #2 on: October 01, 2020, 06:16:27 am »
I have still not found my problem.
To recap, I have no power to turn the brush head. I removed the hose from the machine and put my hand over the opening where the hose attaches below the canister. It makes a flutter sound for a half of a second and then sounds like a flap closes. The suction is still there but I don't know id it is exactly as strong as it was. The flap stays closed until I shut it off and then when I start it again and put my hand over it you can hear the flap close again. And this "flap" sound is in the motor.
Now, if I remove the canister and put my hand over the inlet on the top duct assembly it does not make the "flap closeing" sound.
I still would like to know if this unit has a relief valve and where it is.
I can not find a parts diagrams that shows all parts. The only diagrams I find show only the basic main components.
Any advice?

Dyson Cylinder Spare Parts



Trade Dyson Spare Parts



Dyson Spare Parts



Freestanding Dyson Cordless Vacuum Stand



Buy a Dyson DC04 Wand Handle





Buy a police truncheon




Dyson Spares, Parts, Advice   Follow us on Twitter

Manchester Vacs on Instagram