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Have 5.0 karcher, and it will not sray any water or pressure out the gun, WHY??

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Make sure that the lance is not blocked and the control valve is ON. Oil coming out of air filter,too much oil in engine,or oil too light should be 30wt, air filter dirty, over speed of engine,these are the only things that can cause this problem.

Hope it helps and have a great day!

Posted on Jul 01, 2009

  • Melvin Ramos
    Melvin Ramos Jul 01, 2009

    It is important that you must have mentioned the model number of your
    Karcher. Just the same I can surely say that your machine's fault lies
    in the "SPILL VALVE"

    When the gun is open and pressure is being produced, the spill valve is
    in a relaxed position. Also it has at the bottom a valve, which when
    pressure is produced it is closed. If this does not close due to dirt
    or corrosion, the pessure goes down. Now when you close the
    gun,pressure forces the spill valve down to close the electrical
    system. Now if the "o" rings of the spill valve are damaged, the
    machine will start going on and off while in stand-by. So if you know
    how to locate the Spill Valve, all one has to do is change it with a
    new one.

    In some Karcher machines there are 2 spill valves. One regulates
    pressure and the other one is for switching off the machine when the
    gun is closed.

    Low pressure could also be due to faulty suction or delivery valves. Most probably the suction valves.

    But when saying that there are short interruptions while in stand by, I stick to the fact that the spill valve needs renewing.





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