Question about Karcher 2500 PSI Pressure Washer

3 Answers

Engine starts easy. engine revs up and down but does not maintain a constant. Preasure tries to come up and then quits. the governor eeps moving back and forth. I have cleaned everything including the unloader. I used lithium grease on the o rings and still it does the same. Could this be caused by bad gas, even though it starts and runs very easy

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  • t_covert May 07, 2010

    I've already checked and cleaned all conections. Water supply is very strong. It just seems like it can't get the motor reved enough to pump up the preasure.

    The problem happened last summer when I ran out of gas and put new gas into it. It started and the presure was good for a few moments and then the preasure just died down.

  • t_covert May 07, 2010

    Where is the preasure regulator located?

  • t_covert May 07, 2010

    I have taken the triger wand off and ran the unit. It did not put out any more preasure.



    I read about pouring oil into the water inlet valve and taping with a hammer. Would I tap on the place where the unloader houseing is?

    This unit has not been run but a few hours and I've kept it in my climate controled garage during the winter.

  • t_covert May 07, 2010

    this is low preasure. I've done everything that the manual has suggested. nothing works. I read on your site that the water inlet could have some motor oil poured in it and let it sit over night. Would this help loosen up the valves?

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3 Answers

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Hi And welcome to FixYa. I am Kelly

I doubt that it is caused by bad gas.

-It can be caused by a dirty float bowl nut or a restricted orifice in the bottom of the carburetor venturi.
- Also a broken or very worn governor spring can cause it to hunt.
-On a vertical Honda Engine the rubber hoses being cracked can cause this also.
- A worn or missing butterfly spring can cause this.

Is this a Briggs and Stratton engine or a Honda GX160? Also Horizontal or vertical? That information is important and needed to offer your the correct response. Complete Engine Model number is needed for parts reference also.

I will respond as soon as I can once I have that Engine Model Number information.

Thanks,

Kelly

Posted on May 08, 2010

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  • Kelly
    Kelly May 08, 2010

    Hi, I am the person that said oil through the water inlet will help with pressure related problems. The unloader is on the power head before the pressure hose feed line. What ever you do, don't hit the power head with a hammer. USE block of wood and hit the wood! If it persists the only other option is disassemble and clean the unloader. There are several small parts so be real careful if you get to the point of working on the pump. It can turn into a $389.00 plus shipping mistake.



    One other thing to do is to rapidly fan the wand control on and off like 30 times or more at 0.5 second intervals to force the unloader to work more often AFTER you put oil through the pump.





    Kelly

  • Kelly
    Kelly May 08, 2010

    Download this parts manual The unloader / thermal valve that is supposed to reset is Item(s) 9 {Valve 60 GND} and 12 {Spill Valve} of detail A on page 11. The spring, seals and housing need a good thorough cleaning to get high pressure. If the seals are damaged they will have to be replaced.



    Kelly



  • Kelly
    Kelly May 08, 2010

    See the Karcher link here and watch the video

    http://www.karcherresidential.com/help/i...



    Please go to: http://www.karcherresidential.com/en/vid... and click on the "Troubleshooting: Inconsistent Pressure"



    That is about all I can do from here. Lets it works for you.



    Kelly

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  • Master
  • 4,090 Answers

Are we talking compression in the engine or water pressure here?

The pressure of the water that the motor pumps is controlled by a pressure valve and seals, some of which it sound like you have found. But overall it is the pressure valve which maintains the volume and pressure of delivery of the water.

I had my own done recently and the cost was $150.00to replace the valve and service the unit.
Hope that is what you were asking

Cheers

Posted on May 07, 2010

  • dennis bullard May 08, 2010

    I found this recommendation frrom another entry that describes the use of oild and where to hit it

    These pumps are notorious for seasonal problems.
    Tip the unit to the
    point you can pour engine oil into the water inlet connection. What
    your attempting to do is free up the ball seats in the pump. They get
    corroded when they sit and lock in place. Adding the oil or a vast
    amount of WD 40 to the water inlet often does the trick for loosening up
    the seat balls and springs.
    After you add the oil (3 - 4 ounces) or
    WD 40 to the water inlet line just slowly pull the engine through with
    the ignition switch off. As the water inlet cavitates add more oil.
    Let
    it sit over night and then take a block of wood and a hammer and tap on
    the power head. Don't over do it and do it in such a manner your not
    going to shear off any bolts or break anything. But... be serious with
    the hammer and block of wood.
    Then connect inlet water hose, the
    pressure hose and test the unit. You may want to purge the oil lubricant
    into a bucket before you start the engine.

    Give it a try and see what happens.

    nettiser


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  • Master
  • 1,051 Answers

If the engine is running you can rule out bad gas. Check the couplings and the pressure reguator to ensure a tight seal.

Posted on May 07, 2010

  • Bob Korsu
    Bob Korsu May 07, 2010

    Sorry, I didn't take a long look at at the Karcher model you have. Unfortunately thr pressure is regulated in the 1st stage (the main unit) then distributed in the form factor you need in the second stage (the handle/trigger mechanism). If you can remove the entire trigger mechanism and the unit runs OK, the problem is a defective valve in the trigger housing.



    Sorry to be putting you through all this.



    radar

  • Bob Korsu
    Bob Korsu May 09, 2010

    Another consideration is the motor is in need of a tuneing to get it to run at optimum speed. Try adjusting the choke (small lever, usually just in front if engine) to increase gas/air mix. When moving the chock listen for the engine to change speed. At it's fastest is near best.

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