Question about Karcher K2.26 Electric Power Washer

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Karcher 378M Plus Motor idle High and low or start and stop

My unit motor start to idle high and low or start and stop, Motor will stop idleing as soon as I squeeze the trigger but pressure is very low.
I clean filter and nozzle/hose do not seem to be clogged.

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: gas pressure washer

I have the same problem with a Karcher 2400hh.
Go to: http://www.wmpcs.com/index.php?main_page=page&id=14
they have the best diagrams and answerss that I have found.

Posted on Jul 06, 2009

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  • 174 Answers

SOURCE: Karcher G 3000 BH Engine Pumping Problem

This may not be a motor problem. It sounds like your pump is not working properly and the motor is just following the pump. First thing to do is check for leaks in the pump, wand hose, gun etc. It may also be a blown water seal inside the pump.

Posted on Aug 18, 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

  • 5603 Answers

SOURCE: sometimes when I squeeze the trigger I will have high pressure

The bypass valve is sticking.

Posted on Sep 23, 2009

  • 5603 Answers

SOURCE: Hello there.My Karcher pressure washer motor

The valve that admits more water to be compressed is stuck. It is likely the O-Rings on it need replacing. No water to the pump, no pressure!

The motor will stop when pressure is up to the designed pressure.

Posted on Oct 03, 2009

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