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I have a karcher k3.97 when i turn it on the motor runs continuously but gives out no pressure

Water passes through the unit fine when i hold the trigger water trickles out of hose end also when unit is on water come out fro under the unit i checked the both the inlet and outlet and both seem to be fine unit started doing this whilst in use thank you for any help you maybe able to give me.

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Posted on Jan 02, 2017

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SOURCE: karcher k7.80 pressure washr

I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

Posted on Jul 16, 2008

  • 56 Answers

SOURCE: Karcher K4.97M electric waterblaster cycling

It sounds to me like the unloader valve is bypassing internally.

Posted on Nov 18, 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

  • 299 Answers

SOURCE: Karcher K2.36 motor cut out and won't restart

Yes, the water should be turned on first but if it only ran for a minute or two it should be OK. Most late model pressure washers have an automatic shutoff when the trigger on the wand is released. Turn on the water and then the machine and then squeeze the trigger on the handle of the wand and the motor should start as soon as the air is cleared from the line by the flowing water (about 10 seconds). If the unit was put away wet last season you may need to clean the nozzle with a piece of wire too.

Posted on Apr 16, 2010

Testimonial: "Thanks brobin, your advice was spot on and it is now working again, much appreciated"

  • 15 Answers

SOURCE: Water is leaking from under the chrome piece

Plastic Pump Manifold is cracked.
Can be replace at a local Karcher Service Center, or if you are mechanically handy. Replacement Manifold Complete, is available from www.karcher.com.
If it is under 1 year old, and under warranty Karcher will replace if you have a Receipt proof of purchase.

Posted on Jul 14, 2010

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