Question about Karcher 2500 PSI Pressure Washer

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Won't build pressure

Unit worked fine the first year, but won't after sitting for a winter, what should be checked, supply pressure is ok.

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  • Gary Alford
    Gary Alford Jul 29, 2012

    Check karchers web site on this, they have a video on the fix, its easy.

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The adjustable wand or pressur regulator may be clogged with rust inside. it's economical to replaced the wand assy.

Posted on May 25, 2008

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Posted on Jan 02, 2017

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Pressure washer won't pump


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Have a 2001 dodge stratus 2.7 95,000 miles going through second winter with no heat, flushed system, changed thermostat, checked for blockage, appears that there aren't any, hoses get hot, pressureized the...


I had the same problem with the same car...
I replaced the climate control center, (in the dash selector) and this solved the problem. I discovered this by first swapping mine out with a friends who had the same unit. This is an expensive part at the dealership but I now have heat. Hope this helps, I had a couple of long winters driving to work also!

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Coleman model APW-120 May have frozen while stored over winter the unit is new but water was not completly removed before storage. Problem motor runs continuosly but there is no water pressure I have...


Whar has happened is that your unloader / bypass valve is sticking. This is due to minor corrosion and having water in the unit over the winter. Most of the time they will sanp out it if you do the following:

Add 3 - 4 oz of oil into the water supply connection and briefly and I mean very briefly switch on the unit then right back off. Add more oil to the water supply connection and then let it sit overnight.

Then next day turn the unit on briefly and let it sit another 30 minutes. After this you connect all hoses making sure to purge the air our of the supply hose BEFORE you connect the to the unit. Then once you turn the unit on rapidly trim cycle the wand trigger. Your goal here is to cause a water hammer of the unloader / bypass valve to get the spring and cupped seal to move in the housing. Pause briefly and see if pressure builds then fan the wand trigger again. This can take a few minutes to get it to work but the routine of pausing waiting momentarily and rapidly tripping the wand trigger is what should get the unit going again.

If this does not work you will have to take the unit apart dis-assemble the unloader / bypass vavle on the output side of the pump and remove the corrosion on the spring and the housing.


Once your done cleaning up the bypass unloader valve before you put it back in the housing place a liberal amount of Lubriplate #105 White Grease on the spring and inside the housing on the mating surfaces. (#105 white grease is available at any Auto Parts store. It is in a 3 - 5 oz plastic tube)

Re-assemble the unloader / bypass valve an it should work like a champ.

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