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Author Topic: Pre filter needs cleaning after each use  (Read 1429 times)

Offline simonb

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  • Country: gb
  • Gender: Male
Pre filter needs cleaning after each use
« on: February 25, 2014, 03:27:44 PM »
I have a mysterious problem with a DC07. I have seen other posts from people who have had filters clog up after each use but the solution in that case was the fine-dust seal in the cyclone chamber. Well, that didn't fix it.

Here is what I have changed and cleaned so far...
  • Cyclone unit  jet-washed using an unusually high water-pressure shower
  • Pre motor and hepa filters changed (twice)
  • Fine dust collector seal between cyclone chamber and bin base
  • Exhaust pre-filter seal
  • Entry seal

I have attached some photos of the pre-filter after just use with new filters and a cleaned cyclone chamber. With the new filters the suction is very good right now and, for the first time in a long time, I can feel resistance to it being pushed along due to the good-as-new suction. However it won't stay that way if the filters continue to clog that quickly! This is my second attempt at changing all the filters. I know the paper pre-filter and the hepa filter soon clog up and won't let much air through. I found the newer paper pre-filters don't indicate that they can be washed. I am always washing the sponge part.

One thing I noticed is that the dust is a thin crescent on the opposite side to the exhaust inlet. I have attached some photos of this. This is strange since I would have expected the dust to be evenly distributed or focused at the same side as the exhaust inlet. Does this give any clues?


Offline simonb

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  • Posts: 4
  • Country: gb
  • Gender: Male
Re: Pre filter needs cleaning after each use
« Reply #1 on: March 02, 2014, 09:48:34 AM »
OK. After another session it is clear now where all the dust in the filter is coming from. Dust appears to be directly ingested into the rim of the pre filter. I have attached a photo of the removed pre filter. There is a dust tail at the place where it would normally point at the carpet. When I remove the yellow pre filter the dust extends between the pre filter and the outer pre filter housing.

I have also attached a picture of the place where the pre filter sits. I can't see any obvious signs of wear or damage so I am mystified how all this dust is getting in. Either that or how a working DC07 manages to NOT let the dust in!

Does this mean that the seal around the fan casing needs replacing? It doesn't look damaged.

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