Question about Karcher K2.26 Electric Power Washer

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How do i know if my outside tap has a non - return valve i want to start using a pressure washer

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  • Philip Gaut May 11, 2010

    What country are you in?  I can advise on UK plumbing but not elsewhere.


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If del_brenda_s lives in Canada or US, just go to the hardwre stire and get a Gardena connection for your garden hose. Under $10

Posted on Jun 05, 2009

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Dear del_brenda_s,
I have been servicing Power Washers for the last 5 years. And I cannot understand why you need a non-return tap outside. I think "outside" you are refering to the main supply after the water meter.
Well if your power washer needs a non-return, you can fit a cheap garden hose non- return attachment.
Regarding the non-return at the outside tap,..this is most probably NON-RETURN. If you want to be sure you can contact the water works division of your country and city...and I am sure they know what sort of taps should be used. In my country it is a must that a non-return outside tap is used. This is important so that when there is a cut in the water supply, the water meter and the whole system will not have to be bled out of air when the water comes again.

Posted on May 31, 2009

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1 Answer

My Karcher 11/5 U starts and stops when not in use

Pressure washers do this due to a valve called the 'unloader'. It's purpose is to relieve pressure from the pump when not in use so it is not under continuous strain, but there is also a pressure switch linked to the motor that will fire it up if the pressure drops to low so your washer is always primed and ready for action. This means tht the unloader relieves the pressure, then the electric pressure switch pumps it again to keep the pressure high. If it is doing it a couple of times a minute I wouldn't worry, but if it is every few seconds it would indicate to me that the pump is losing pressure constantly somewhere. Main reasons would be;
It could be a weak unloader, which is basically a strongish spring and a couple of plates and seals, but would normally come as a kit or complete valve.
A leaky seal in or around the pump. If this was the case you should see water leaking from the unit somewhere and then you could pin point the worn/damaged seal and replace it. Most washers have seal kits and it is advisable to replace seals in this way as it saves time later (especially if a worn seal, others will be wearing out too).
Failed non return valve. In the pump head there are normally two non return valves per piston (one directly after the piston and one a bit deeper into the outlet side) and also a couple in the back end of the pump head. These basically allow the pressurised water to be pushed through the pump and stop it flowing back into the cylinder set. If the water can flow back as well as forwards it will not keep pressure (like blowing a balloon up but not holding it shut between breaths). Non return valves will normally be supplied as a set and will be assembled already so just push into place when the pump head is apart. You would not see a leak if thesse valves are perished as the water will just flow back toward the source instead of out of the machine anywhere.

Sep 28, 2014 | Karcher Garden

1 Answer

My pressure washer starts and stops constantly. It seems to not hold pressure. Is that just a seal replacement?

It sounds like there is a leak in the output pipes or the non-return valve on the input to the pump is not sealing properly and allowing any pressure built up to leak back. If there are no leaks in the output pipes then it must be the non -return valve that is faulty. You could try removing the valve an cleaning it but usually once the valve seal is damaged, the only fix is replacement of the valve.

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Make sure first you are using the correct nozzle, see this link

Then if you are still having problems it is going to be something wrong in the detergent valve, see this link to give you more information on repairing that

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1 Answer

The water is going out by the inlet soap fitting, and the soap compartment gets full of water

You will find that the non return valve as stuck inside your pump.If you follow the pipe back to the pump you will find a non return valve which is a ball and spring. Please remove this and replace if required.
this should then stop the water and soap returning back.

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Sep 20, 2009 | Karcher K2.26 Electric Power Washer

1 Answer

I have tried to use my Karcher washer model 411A using the suction tube which is immersed into Patio cleaner bottle but it does not work what am I doing wrong

you have to lower the pressure at the lance for the detergent to be drawn into the hose. It works on a venturi principle.
on the lance you will have to twist or pull back the end for it to go into low pressure mode.

the easiest way to check it is working is to take out the lance extension , the bit that fits into the trigger on a bayonet fitting. run the machine and see if it then draws in detergent.

If it doesnt draw detergent then look to see if there is a detergent valve fitted to the filter that goes into the bottle and check that it is fully open. sometimes ther is a non return valve fitted into the filter too.
it could be that this non return valve has stuck. A poke with a bit of stiff wire should free it off its seat if it is that problem.

hope this helps a little

Jul 17, 2009 | Alfred Karcher Pressure Washer

1 Answer

I have a detergent tank and cant seem to get detergent to come out what do I need to do?

Dear bug4222,
I have never worked on your type of machine. But generally this is what you do. Disconect the pipe from the inlet to the machine. Attach another pipe and put the other end in a bottle of water. Start machine and on low pressure see if the machine sucks water from the bottle. If this does not happen, try to service the inlet part at the machine. This usually it will have a ball-bearing as a non-return valve. This non-return valve sometimes gets stuck. If you see that you have solved the fault in the non-return valve, attach the detergent tank as it was, but instead of detergent, use water. You should always use low pressure. If all is OK, try some detergent. Always remember that after using detergent, always pass clear water from the detergent tank. If you leave detergent in the system, this will cause problems.

Jul 16, 2009 | Campbell Hausfeld Garden

1 Answer

Porter Cable pcv2250 pressure washer shooting water out of siphon

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new non return valves are available.

Jul 06, 2009 | Porter Cable Cable Commercial Pressure...

1 Answer

Honda p/washer won't **** up cleaning chemicals cleaned filter,still no go.

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