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[Solved] Karcher 5.55 - no water pressure, the engine is running all the time

TechnoRocker 141708 35
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  • #1 13373279
    TechnoRocker
    Level 11  
    I have a problem with the Karcher K 5.55 Jubilee pressure washer. The problem is that when the trigger is pressed on the gun, there is no water pressure on the nozzle, and at the same time the engine starts and runs all the time even after the trigger is released. The engine is only switched off via the main switch.

    For a few months I had similar problems, but for the pressure to appear on the nozzle I had to first pull the trigger on the gun, turn the "VarioPower" nozzles to the "MIN" position and then to "MAX" and then it was OK. Now this method doesn't work at all anymore.

    So I dismantled the washer practically speaking for the first parts.
    I unscrewed the valve from the aluminum pump and there is an o-ring on it and a red plastic band that is cut
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  • #2 13373361
    tomrom1985
    Level 30  
    I had a similar problem. In my case, the o-ring in the lance gun was damaged.
  • #3 13375940
    TechnoRocker
    Level 11  
    I forgot to add that I had just bought a new gun and "VarioPower" nozzles and it did not work, and then the old gun with the nozzle and hose was checked on a different washer, also the same 5.55 model and everything was fine.
  • #4 13377680
    wojtasdw
    Level 15  
    Quote:
    red plastic band that is cut
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  • #5 13386785
    JACU626

    Level 28  
    Why did you open the pressure control valve from the top photos? It is pulled out completely, checked if it does not let go, lubricated and inserted. The red band is a retainer, make the valve head forks from the bottom and the top. Are these three valves inside smooth or sandblasted ?? Is there a crack between high and low pressure on the valve head ??
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  • #6 13389138
    pablo_k
    Level 12  
    Replace the heads and that's it. you can't fix it anymore.
  • #7 13389791
    TechnoRocker
    Level 11  
    Karcher 5.55 - no water pressure, the engine is running all the time Karcher 5.55 - no water pressure, the engine is running all the time Karcher 5.55 - no water pressure, the engine is running all the time Karcher 5.55 - no water pressure, the engine is running all the time Karcher 5.55 - no water pressure, the engine is running all the time

    The inner part of the head where the pistons fit has been melted. It seems to me that I will probably have to buy a new head.
  • #8 13390124
    JACU626

    Level 28  
    pablo_k wrote:
    Replace the heads and that's it. you can't fix it anymore.


    Clairvoyant????? only which valve or pressure :)

    It turns out that the valve is ok, show the pots from the top

    as I wrote, the problem is in the control valve that you unscrew and mixes with water inside instead of creating pressure, twist it and show it in the photo, I will explain to you how to check if it holds.
  • #9 13391036
    pablo_k
    Level 12  
    the lower one is approx. the upper one is responsible for the pressure control. in the service about PLN 250 and together with the relief valve. The new one comes all aluminum. better not to use chemicals through this device
  • #10 13392768
    TechnoRocker
    Level 11  
    Karcher 5.55 - no water pressure, the engine is running all the time Karcher 5.55 - no water pressure, the engine is running all the time Karcher 5.55 - no water pressure, the engine is running all the time

    I have screwed this valve in, so how can I now check if this head element is working?
  • #11 13413783
    TechnoRocker
    Level 11  
    Can someone tell me how to check the control valve?
  • #12 13483788
    Żurawski Marcin
    Level 2  
    Hello. The part of the head from which you unscrewed is damaged - you opened the relief valve, this head must be replaced. This valve should not be turned on as you did. One more part of this important control valve remains in the head. For some reason (temperature?), The plastic deformation in this head takes place and this valve does not work as it should, i.e. the control spool and it should work smoothly, and it blocks and does not overload as it should. I can see myself, but I do not see a problem in it.
  • #13 13556937
    anielski123
    Level 12  
    I will connect to the topic, so I read a bit, but I did not find an answer to my problem, namely:
    I have the washer the same as the author of the topic. I do not use chemicals, only water - it's just for the news. I turn on the washer, press the gun and d ... a, only a gentle touch of the switch - ON OFF (or tapping it) will turn on the water and so every time I have to knock it. If it starts, the washer turns on and disconnects at the (maximum pressure) setting every few seconds at equal intervals. When the pressure is reduced, it works normally and does not disconnect, although when I release the water, then start must be done by flicking the switch (sometimes a gentle touch of the switch and the washer works). Is it the switch itself to be replaced or the pressure valve you write about.
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  • #14 13570630
    anielski123
    Level 12  
    Will no one answer ...
  • #15 13571151
    JACU626

    Level 28  
    Regulating valve stuck.
  • #16 13571174
    anielski123
    Level 12  
    JACU626
    Thanks for the answer. You wrote earlier how to check such a valve, but you did not write how to do it ... I understand that if it does not hold, it must be replaced, can it be saved ...?
  • #17 13571719
    JACU626

    Level 28  
    lubricate, start and put in
  • #18 13585731
    Żurawski Marcin
    Level 2  
    Hello. I wasn't there a bit, what describes "angelski123" looks more like turning the knob of the electric switch. If you do not see the tamper, you have to disassemble the pump, knock out or pull out the two pins blocking the chemical connection, pull out this connection and behind it there is a pressure switch plunger, which you can remove, inspect and lubricate with good quality grease, preferably silicone. JACU626 in this pump there is no such thing as a "control valve" you are stupid on purpose or unknowingly?
  • #19 13585904
    anielski123
    Level 12  
    Hello again ... I called the service in Lodz and asked how much the control valve costs, after JACU626 wrote that it was his fault ... The answer was "Sir ... there is no such valve in this type of washer" 'Marcin'. ... what do you mean "twist" I turned it on and off ... I didn't do anything by force ... Coming back to my problem, I did one thing, namely ... I turned on the lances and cleaned the nozzle ... it's a little better , but not entirely ... Before, I had to "click" the switch every time I released the gun. Now, after cleaning the nozzle, when I use the gun often it works normally, but if I don't press the trigger (e.g. 3 minutes), then I have to "pop" the switch again ... I do not return it to service .... I will be slowly coming to the problem by trial and error. I hope that I will be able to solve the problem ...
  • #20 13586727
    JACU626

    Level 28  
    Żurawski Marcin wrote:
    JACU626 in this pump there is no such thing as a "control valve" you are stupid on purpose or unknowingly?


    The first post in this topic is the photo on the right and what's on it ???? In DISIS it is called a BY-PASS VALVE and its job is to regulate the pressure. It can also be called a by-belt valve because when it fails, the electric switch opens and releases high pressure to return, so I call it "control valve". When it jams, it often stays open and the pressure washer does not give.

    My friend, Marcin, to your second post on the forum and you are not nice, I have been repairing washers for 9 years, practically all brands.

    www.karcherserwis.pl

    I invite you to see that I do it on Sunday afternoon but every day 10 hours from Monday to Saturday

    greetings

    Jack
  • #21 13607979
    Żurawski Marcin
    Level 2  
    Hello Jacu 626 I'm sorry. I don't want to explain too much, just I'm sorry.
  • #22 13623297
    anielski123
    Level 12  
    JACU626 wrote:
    lubricate, start and put in

    Thanks to JACU626 for the "telephone" guide on how to remove the defect. The reason was the valve, which is from "chemistry", was obliterated and that was the reason for me. Thanks a lot :spoko: :spoko: :spoko: Greetings. :sm9:
  • #23 13628529
    miculek
    Level 12  
    In my opinion, calling the aforementioned valve a control valve is incorrect. This is an overflow valve - its job is to transfer water from high pressure to low pressure, from outlet to inlet at the right moment.

    I have the same model here and I can't get this valve out for a pee.
    The device works, disconnects and pours, no leaks, no pressure boost, no milk and no pressure :( , no matter how twisted the vario nozzle is, or min. is max is the same low pressure. The accessories are checked, so it is also out of the question. Before unfolding it, she was still taking chemicals, now she does not.
    I prefer an injector or a valve under it and an overflow valve, but I can't get out of any of them :( Do you have any home remedies?
  • #24 13629228
    anielski123
    Level 12  
    The valve, which was blocked in my case, I also couldn't remove, so I unscrewed four hexagonal screws from the top and there is a way to knock it out from the bottom.
  • #25 13629352
    JACU626

    Level 28  
    miculek wrote:
    In my opinion, calling the aforementioned valve a control valve is incorrect. This is an overflow valve - its job is to transfer water from high pressure to low pressure, from outlet to inlet at the right moment.



    Ooooh, I see a colleague, then change the spring in this valve to a weaker one and you will see how the pressure will drop :) Angelic with miculka is a different problem than with you, but from the statements I conclude that he is a high-class specialist :)
  • #26 13632795
    miculek
    Level 12  
    Quote:
    Ooooh, I see a colleague, then change the spring in this valve to a weaker one and you will see how the pressure will drop :) Angelic with miculka is a different problem than with you, but from the statements I conclude that he is a high-class specialist :)


    Hmmm, I do not know what to think after such an entry. I know something ...

    I finally managed to pull out the valve, but it held it horribly. As for the advice that from the bottom (from the center of the head), I do not recommend it because you can damage the head by accident, it is better to use a vice.
    Everything is cleaned, purged, rinsed, agitated iiii ...
    works ... finally.
  • #27 13685799
    filo84
    Level 11  
    I had a similar problem recently, but in K4.
    The engine is running and there is no pressure.
    However, the sound of the motor as if it was running without load, i.e. it is not driving the pump.
    When turning the electric motor by hand, the pistons do not move.
    After unscrewing it, it turned out that the pistons remain in the pressed position.
    The pistons were gripped so tightly that there was no need to do without a hammer.
    The reason was a raid on the aluminum, probably a water scale that blocked the pistons in the depressed position.
    I cleaned it gently with sandpaper and it runs like new.
    Already two months earlier, I noticed that it works strangely, i.e. I press the trigger on the lance, the pressure is a bit weaker and the engine works differently, as if it was lighter, and only a moment later it caught the load.
    It was probably already starting to catch the pistons then.
  • #28 13685942
    JACU626

    Level 28  
    The k4 washer is a different story, the plastic head is there.
  • #29 13687808
    filo84
    Level 11  
    Plastic and aluminum like in Chinese scythes. When bought from Leroy, it does not go crazy, but it's better than scrubbing carpets by hand.
  • #30 13688519
    miculek
    Level 12  
    Each material has its advantages and disadvantages. Aluminum reacts with chlorine, so be careful with chlorinated water. I have seen more than one such aluminum head. And here it turns out that "plastic" is superior to aluminum. When the head is "eaten", it may no longer be tight.
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Topic summary

The Karcher K 5.55 Jubilee pressure washer is experiencing issues with no water pressure when the trigger is pressed, while the engine runs continuously until switched off. Previous attempts to resolve the issue included adjusting the "VarioPower" nozzle settings, but these methods have failed. Users suggest that the problem may stem from a damaged o-ring in the lance gun, a malfunctioning control valve, or issues with the valve head. Some users have reported that the valve may be stuck or damaged, requiring replacement. Cleaning and lubricating the valves and checking for cracks or blockages in the system are recommended troubleshooting steps. In some cases, users have found that the pistons may be stuck due to scale buildup, which can be resolved by cleaning. The discussion highlights the importance of inspecting and potentially replacing the valve components to restore proper function.
Summary generated by the language model.
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