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Karcher 340 water cleaner with no pressure.

I have a Karcher 340 water pressure cleaner. I have two problems. The first occurred some time ago, but didn't effect the operation of the unit. The motor runs constantly whether I squeeze the trigger or not. Naturally, when I squeeze the trigger I get high pressure water. The second problem happens not long ago. I don't get any pressure when the water comes out of the nozzel. Yet when I disconnect the wand and re-insert it again, then I get full pressure until I let go of the trigger. After that I don't get any pressure until I remove the wand and re-insert it.
Thanking you in advance.

Rudy

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Posted on Jan 02, 2017

  • 187 Answers

SOURCE: Karcher K 3.68 M operation

These units have pressure valves that automatically turn off the pump once the pressure is high enough. The pressure switches do fail and sometimes stick and act as you've described.

Posted on May 07, 2009

  • 92 Answers

SOURCE: Karcher 3.97M Short cycles after trigger is released.

Dear csdamman,
There is a valve called the spill-valve. It is often called the control valve. This valve activates the micro-switch. When the gun is released, pressure builds up and compresses this spill valve. At the same time it puts off the micro-switch. This will then stop the machine. Now when the spill valve is faulty it cannot hold compreesion under pressure so it starts de-compressing and starts the machine again. This goes on in a cycle as you explained. So you have to change the spill valve. If the spill valve that operates the micro-switch is part of the upper head,...then the whole head must be renewed. Myself I rarely service Spill Valves. The best thing is to renew it. From your explanation it seems that you did not take notice of this Spill-Valve. Infact when you mentioned Pressure Switch, I do not know if you are refering to the spill valve. If you are....then saying that the Pressure Switch moves and operates freely, does not mean that it is OK.
In certain machines in the outlet...there is a small valve, coloured black and red or green and yellow. This sometimes when faulty, it gives the fault you mentioned. Sometimes an inlet valve gives the fault you mentioned. But from my expirience it is most of the time that the Spill-Valve is the fault.
Regards,
Fulltech.

Posted on Jul 22, 2009

  • 174 Answers

SOURCE: 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.

Posted on Aug 25, 2009

  • 61 Answers

SOURCE: karcher k3.86 lowered operating pressure and

It sounds like your non-return valves are damaged. in the pump there are usualy 3 non-return valves, these are located under 3 large brass hexagonal caps. take the valve out and inspect them. if you are lucky they may just need cleaning, as sometimes foreign object that enter the machine with the water get jammed in the valve. if your unlucky the springs in the valve will be damaged and you will have to replace the valves. I hope this helps you out.

Posted on Sep 20, 2009

  • 251 Answers

SOURCE: We have a Karcher G2500VH pressure washer. If you

Hi, Karcher calls the unloader valve a spill valve,
this is a link to a full drawing/parts listing , and your fault description might well be a sticking /seized unloader(spill ) valve hope this helps
http://www.pressureparts.com/ManualViewPage.aspx?Manual=/mmDEV/PDF/karcherparts/g2500vh.pdf

the part number is on page 9 of the drawing
spill valve 45910400
hope this helps , we usually use some good quality silicone grease to lube the valve ,

Posted on Mar 08, 2010

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