Question about Karcher 2500 PSI Pressure Washer

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Karcher KB 499

My karcher is making a continuous pulsing pump noise, when you have stopped hosing. We seem to think it is the pump playing up.

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  • Anonymous Mar 11, 2008

    I have a Kharcher 360 high pressure washer, which surges when in standby mode, there is no sign of an external leak, I suspect a faulty valve, I have stripped the valve body but cannot find a fault, please help.

  • Anonymous Mar 15, 2009

    my pump also pulsing and i have lost pressure

  • Anonymous Mar 30, 2014

    Making a strange noise and leaking at bottom

    Making a strange noise and water coming from bottom

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A high pressure had a pressure relaese valve may be the problem.

Posted on May 25, 2008

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Hi the pump surges when there is a leak on it find the leak that should sort your prob.
Hope this helps. Sean

Posted on Mar 04, 2008

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Karcher pressure washerk7 85m is pulsating what is the cause of this please


See links and videos

Karcher k7.85 Pressure Washer Pulsing when is not in use - YouTube

2q==? 0:58 https://www.youtube.com/watch?v=R9cAGbtjVE4 Jun 17, 2014 - Uploaded by Valdi w Any ideas ?? Missing: washerk7

Karcher K7.85 Pulsing Problems - YouTube

z? 1:15 https://www.youtube.com/watch?v=QB1rk5zkhjM Jun 11, 2014 - Uploaded by Valdi w 1:12. Karcher k7.85 Pressure Washer Pulsing when is not in use - Duration: 0:58. Valdi w 14,672 views · 0 ... Missing: washerk7

karcher k6.85m pulsing problems , Here's scheme . - YouTube

2q==? 0:50 https://www.youtube.com/watch?v=d8TNOu14gsI Jun 6, 2016 - Uploaded by mihai baciucu PUMP CYLINDER HEAD SCHEME ,I changed myself these valves ,Diagramme n°: 0009 , 0010- ... Comment ... Missing: washerk7

Karcher Pressure wash pulsating! - Page 1 - Bodywork & Detailing ...

https://www.pistonheads.com/gassing/topic.asp?h=0&f=136&t=970368
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Feb 26, 2011 - 17 posts - ‎16 authors I have a small Karcher pressure washer that I use to clean the car. It works a treat with plently of pressure, however, as soon as I let go of the ... More results from www.pistonheads.com Missing: washerk7

Karcher K2 Pressure Washer - pulsing problem ' Screwfix Community ...

https://community.screwfix.com > ... > Landscaping and Outdoors
  1. Cached
Mar 21, 2017 - I have a K2 Karcher pressure washer [IMG] I've added a video, although its not ... Karcher k7.85 Pressure Washer Pulsing when is not in use. Missing: washerk7
Karcher pressure washerk7 85m is pulsating Google Search


Jun 08, 2018 | Karcher Garden

1 Answer

How do i stop it from pulsing?


Getting to much air to carb probably.

Jul 11, 2015 | Karcher Garden

2 Answers

I have a karcher kb9020 which pulses when idol any ideas why


The "manifold" as talked about above is also called the "Control head".
For a picture of the very small cracks in the control head see here: Karcher Control Head cracks

The video linked to below talks about the cracks in the control head at 7:00 through to 7:08. They guy incorrectly calls it the cylinder head in the video. How to FIX Karcher pressure washer

If Karcher made the control head from an aluminium casting, or used a metal insert near the point of failure, their product range would be a LOT more reliable.

May 30, 2014 | Karcher PSI Electric Pressure Washer

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

Karcher 620m wont work at high pressure


what you describe indicates a problem hose or block nozzle jet
if it doesn't play up with a normal nozzle then it is not the hose or jet but that particular wand and nozzle you are using
do you have a sufficient inlet water supply for the pump

May 01, 2017 | Karcher Garden

2 Answers

My karcher seems to pulse when on, could this be due to the low water pressure from the hose?


I do not have specific experience of your machine.
However, the high pressure pump will be controlled by a pressure switch on the high pressure outlet to the pipe and jet.
Pulsing (turning off) suggests that the outlet (high pressure) pipe is blocked or partially blocked. Try checking the nozzle and (with the unit turned off) clearing it with a fine piece of wire.
Hope this works
Nic Williamson

Apr 23, 2011 | Karcher K2.26 Electric Power Washer

2 Answers

I have a Karcher KB5050 it started to pulse when the trigger stopped


Is there water leaking from the bottom ? If so, then you have a leak in the pump. Bad seal or crack in the Pump.
If under 1 year old and have a receipt, Call Karcher for a warranty replacement.

May 14, 2010 | Karcher 1750 psi Electric Pressure Washer

2 Answers

My Karcher pulses when on standby,stops when i use the trigger,but it also seems to have lost pressure.Is less than 6 months old but have lost receipt!


Is there a leak from the bottom ?
If so Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A design weakness.. A New Manifold Complete Replacement approx. $61.03.
If not you may replace the Pump Manifold Housing from Karcher, or locate a local Karcher Service Center.
If under 1 year old, and you can find a receipt,Karcher will replace the entire Pressure Washer under warranty.

May 03, 2010 | Karcher K 5.85 M Electric Pressure Washer

2 Answers

POWER CRAFT BY Karcher bought Aldi on 31Mar 05.2100Watts 130 bar.


You did winterize the machine? Leaving water in a powerwasher will freeze and damage the pump. It's a common happening, because people don't think of it or are not told by the maker.

Apr 29, 2010 | Karcher K2.26 Electric Power Washer

2 Answers

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.

Jul 29, 2007 | Karcher 2500 PSI Pressure Washer

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