On 18/04/2019 22:02, Tim+ wrote:
AJH wrote:
My niece has asked me to "fix" her newish Dysaon DC54 which seems to be
suffering from too high a pressure drop across the canister which is
triggering some sort of shut off valve in the motor unit.

It was used to clean up some plaster, whether spilled fresh or sandings
I don't know.

I'll drag a cmpressed air line out and back flush each cyclone I can see
a spout for (42) but if that fails is there a chemical that will
dissolve plaster (calcium sulphate). I don't think brick acid will work
as it is weaker than sulphuric acid that would form the sulphate from chalk.

How soluble is set plaster?

AJH


Plaster will have blocked the filters. Unless youve accidentally sucked up
wet stuff, the cyclones are probably okay.

Wash/replace the filters.


+1 for filters or if a hose has been used something tuck in the hose. Th

Even if it has set it likely will be a very weak bond on any plastic
surface and can probably be dislodged by prodding with a blunt wooden stick.


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