Question about Karcher 2500 PSI Pressure Washer

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Karcher 520M Pressure washer won't operate at high pressure

I have water supply of about 33 gal/min (15 litres/min) (i.e. sufficient to operate 520M). When I turn the Karcher on it runs, but only at low pressure. Doesn't matter whether the wand control is Max or Min.

I dismantled the pump mechanism and cleaned everything. When I opened it I suspected a the "spill valve" was jammed, but its now 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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I had the same problem - good water inlet pressure, no output pressure, even though the lance and handle seemed to be clear and working find.
I found that the electrical switch wasn't being operated correctly by the spill valve and wasn't turning the motor on/off correctly.
Inside the plastic electrical box there is a small white device that presses against the micro switch assembly. Carefully adjust the allen screw perhaps 1/4 turn out or 1/4 turn in to obtain correct operation of the microswitch - you will hear the micro switch clicking in and out when re-assembled. I'm sure they must have a rig to check correct positioning of this screw in the factory!
Hope it helps - mine is working find now and saved me buying another!

Posted on Mar 09, 2009

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SOURCE: Karcher 520M wont operate at high pressure

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

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Posted on Jan 02, 2017

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Karcher 520M wont operate at high pressure


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).

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