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Repair guides and support for electric and gas powered high pressure sprayers, sometimes known as power washers.

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Pump always on, lower pressure, water leaking

I have a Kärcher K 2.01

Recently, when turned on (= electricity switch on) but without pulling the trigger, it started to "kof", that is to turn its pump on and make the same noise as when you use it, but even when idle.

It did so in short bursts for a while.

Now, the pump is always on, even when you don't pull the trigger, there's a little less pressure (though still usable) and you can see quite a lot of water leaking out of the yellow box.

Is this repairable?

If yes, how?


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Obtain a ‘Piston seal’ repair kit and renew the three seals. The water is leaking past the seals and causing a drop in pressure. While it’s apart renew the large ‘O’ ring body seal too.

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John Washington wird auf ewig dankbar sein.

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