Question about Karcher 2500 PSI Pressure Washer

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Karcher 520M wont operate at high pressure

When I turn the Karcher on it runs, butonly at low pressure. Doesn't matter whether the wand control is Max orMin.

I have water supply of about 33 gal/min (15 litres/min) (i.e.sufficient to operate 520M).

I dismantled the pump mechanism and cleaned everything.When I opened it I suspected the "spill valve" was jammed, but itsnow AOK.

Anyone with any experience please? I can't quite work out what switches on the high pressure side of the thing.

Exploded spare parts list at:
http://www.m-and-d.com/karcher_parts.html

ANY pointers very gratefully received.

Dave

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  • 2 more comments 
  • pdewick1 Nov 02, 2008

    Powered up the washer, the motor started, cut off, then nothing. All i get is water delivered from the supply atlowpresure, no high presure water.

  • vwq47 Nov 05, 2008

    GREAT and helpful explanation. Thanks MG - though where I live these valves are not cheap at all!

  • Anonymous Mar 18, 2014

    water quirting out of middle white value & pump cuts out

  • Darren Keating
    Darren Keating Jun 06, 2014

    ???????

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  • Expert
  • 92 Answers

The solution is very simple. All you have to do is change the spill valve.
This because the spill valve is not worth servicing. The actual problem is that the spill valve is leaking from its bottom-part seating. When you close the gun, the spill valve goes down, opens from the underside, and switches the electricity off. When you press the gun, the spill valve returns to normal, and if the underside does not close, you have low presure, because the water keeps circulating.
Regards,
MG. (Karcher service engineer).

Posted on Nov 04, 2008

  • Darren Keating
    Darren Keating Jun 06, 2014

    Should I change my machine for a new one?

  • Darren Keating
    Darren Keating Jun 06, 2014

    ??????

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