Question about Karcher 2500 PSI Pressure Washer

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Karcher HD 655 S Does not come up to full pressure

I have a Karcher electric pressure washer which has started to dump pressure before it comes up to pressure. If I slowly adjust the pressure control it comes to about 40 bar and dumps. I have stripped the pump to check for worn seals etc. but everything looks fine. I have used a 1/2 inch garden hose for years with no problems. Occationally it will come up to full pressure momentarily so it seems the pump is OK. Is there any further checks I can do?

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  • Anonymous Mar 15, 2014

    My hose disconnected on my pressure washer while i was using it and now it will not work could it be a safety cut out switch

  • Anonymous Mar 28, 2014

    While stripping down a Karcher 620m I undid the bolts which hold pump to motor and lost about 100ml (?) of oil. Looks like a 15/40 or sae30 standard oil. It was clean and good oil.
    How do I refill?

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  • Master
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Yes...check the check valve. A one-way directional valve, this part is also known as a DUMP valve. It opens when too much pressure builds in the hand wand (when not spraying water) in order to protect the pump, by returning the high pressure to its source reservoir. I suspect the DUMP valve is stuck in open condition (or nearly open).

Posted on Jun 10, 2007

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1 Answer

Karcher electric pressure washer help starting


The test / reset buttons are for a Ground Fault Interrupter built into the cord / washer. This device will help prevent deadly electric shock in the event of a malfunction - it is the same technology used in "GFI" electrical outlets located in bathrooms, outdoors, basements, etc.

You should have this serviced - or replaced before using.

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Not Simple.
I have the same Problem, the leak is from the seam of the Manifold or on the pressure side of the Pump and the hose housing. In my case there is a small crack in the seam of the Manifold Housing. A manufacturing defect.. A New Manifold Complete Replacement about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

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then click on europe
the international,
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tick the button for you are a engineer and you are on your machine
download.
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