2500 PSI Pressure Washer

2500 PSI Pressure Washer

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.htmlANY pointers very gratefully received.Dave

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2500 PSI Pressure Washer

Product Troubleshooting for 2500 PSI Pressure Washer


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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!

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