Question about Karcher 2500 PSI Pressure Washer

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Gas pressure washer

My unit starts up fine; cleaned out the filter and hose, got a new spray nozzle and fittings, changed the oil, but when Icrank up the unit it will not produce any high pressure. When I pull the nozzle trigger a very low pressure comes out of it, and when I say low I mean low. I have no idea what is wrong. Please help.

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  • eds3845 May 02, 2008

    I failed to mention that the unit is a KARCHER 2400HH

  • LUCYCUJO May 15, 2008



  • wethom1 May 26, 2008

    My Karcher HD2500, Honda engine runs great, pressure would decrease then come back to full pressure until this week and now pressure is very low.

  • Anonymous May 30, 2008

    engine starts easily, idles along well, but when I pull the trigger, a low pressure spray comes out. In a few seconds it turns to high pressure, then back to low- it will cycle back and forth forever!! I've had it to an authorised dealer who could find nothing wrong! This is the Honda 2500. PLEASE HELP!!! Mike Drury



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I have the same problem with a Karcher 2400hh.
Go to:
they have the best diagrams and answerss that I have found.

Posted on Jul 06, 2009


I have a continous low pressure problem with my Karcher 2400. Tried clearing the hose, checked fittings and checked my pump.Have not found the problem. Looking for help.

Posted on May 24, 2008


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The reason for pressure buildup killing the engine might be a stuck unloader valve in the pump.

While you are checking each component of the "output" side, spray some penetrating lube into the "input" side of the pump (where the garden hose connects) and let it be working on the unloader valve.

Fix the spraying problem first:
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All must be clear and open to perform correctly.

Next, pour a few ounces of power steering fluid (or similarly LIGHT oil) into the garden hose, attach it to the pump and turn on the water supply.

Leave the "output" hose, gun, etc. UNHOOKED and point the output port of the pump (where the high-pressure hose connects) towards a vacant, safe area.
Startup the engine and allow the oil in the garden hose to work its way thru. (About 1 -3 minutes of run-time.) Shut it down and attach the high-pressure hose.
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