Question about Karcher 2500 PSI Pressure Washer

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High pressure won't return when triggered

Pump works fine for first 10 mins. When trigger released pump goes into bypass mode - but wont return when trigger pressed.

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  • 13 Answers

If you unplug the tip, will it work? If so, unloader valve is sticking.

Posted on Jul 16, 2010

  • Paul Jul 20, 2010

    Is the unloader valve the same thing as a spill valve?

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1 Answer

My honda xr2600 pressure washer stops running when i pull the trigger


check for a blocked main jet in the carby
the principle is that when the trigger is released there is no pressure in the pump so the engine is idling
when the trigger is pulled the pressure control valve closes the bypass back to the pump and so the motor is loaded up if there is a problem in the carby ,then the motor will stall

Sep 08, 2015 | Honda Garden

1 Answer

No pressur


If you are getting pressure at times that would seem to indicate that the pump is till ok. There is a pressure bypass valve that operates when you let go of the trigger - it does not let internal pressures build up monumentally when you release the trigger........if this valve gets stuck in the open position the pressure is reduced considerably because of the bypass path. Unclog it, clear it. or replace the valve to restore normal operation.

Mar 31, 2014 | Garden

2 Answers

My washer makes a loud pulsing noise when not being used,as soon as I pull the trigger it works fine.


sounds like your unit has a bypass problem either needs adjustment or replaced

Oct 14, 2012 | Karcher Garden

1 Answer

Lack of pressure after releasing the trigger on the wand


Hello awcockerill:
This sounds like the bypass (unloader) valve is sticking. Here is a diagram of your machine's pump. On page 2.4 see part #1. The top of this assembly is a black plastic cover. Remove all of assembly # 1 carefully. Under that is part #8. This is the bypass valve. You need to pull this out, check that the o-rings are not bent, worn or damaged, then lube it good with a VERY VERY good waterproof grease. Re-assemble it and all should be well. The part numbers are on the diagram but where to get them depends on were you live. Karcher web site may give you a number to call. Good luck.

Aug 24, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

When I release the trigger it "idles" fine, but when I re-engage


I have seen this problem alot and it can normally be rectified by clean out your unloader/bypass valve the orings on this valve get damaged as jerr said by leaving hoses and trigger pressurised, the easiest way to test if it is a faulty unloader valve is to do as you say it does and when it is on its weak stream turn your nozzle to detergent or low pressure mode then back to high pressure it should kick the pump back in...

If you do not have low pressure(chemical applicator) on your nozzle you may be able to remove the front half of your lance to achive the same result...

Kind Regards
Brad

Aug 04, 2009 | Briggs & Stratton Power Products 1539...

1 Answer

A FRIEND HAS LENT ME THIS WASHER, BUT HAS T GOT A MANUAL


Best to run hose for a minute before connecting to machine to clear any debris from hose, plug hose to machine and pull trigger to run water through, plug into power and away you go, when trigger not pulled unit goes into bypass mode, it is advised to not leave in bypass for more than about 5 minutes, this model is light and can easly be over heated so I would advise to switch off at machine and run water through every 20 minutes to half an hour for at least a couple of minutes, after you have finised using unit, switch off at machine, disconect water and power then squeeze trigger to release pressure from pump.

Apr 20, 2009 | Garden

1 Answer

Pressure is fine when first started ,if trigger released no Psi


Your uplift injector valve in the water pump is sticking. You need to remove this part. Lube the top o-ring only with a water proof grease. Reinstall this part. You will be up and running again.

You need to use needle nose vise grip tool to easily remove the valve. You need to grind down the vise grip tool to fit the opening where the valve is installed.

To prevent this problem from reoccuring use a pump guard additive.

Apr 05, 2009 | Karcher 2500 PSI Pressure Washer

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