Question about Karcher 1750 psi Electric Pressure Washer

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Pulsing when sitting idle and low pressure Karcher K3.81M

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  • mngyler Jan 03, 2011

    Hello Karcher user world,
    I have exact same symptoms as described by tlcteck6 above, with my 399M electric unit, but unfortunately no-one has submitted a solution. I have tried pulling everything apart, cleaning

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 22 Answers

SOURCE: pulsing and lost pressure

depending on amount of use i have found failures of the piston spring and retainer which are located inside main housing of pump,these cause pulsing and no pressure,you need to remove pump head and face plate to get to them,hope this is of help

Posted on Mar 30, 2009

  • 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

  • 608 Answers

SOURCE: karcher pressure washer keeps pulsing when not in

This can happen if the head of the pressure pump has split. You may need a new head, and to stop this happening again, tie the rigger open with a zippy tie. The water will run all time now and automatically bleed any air form the system. When you want pressure, turn it on at the main switch. This will prevent hydraulic hammer, (when you pull the rigge)r, which is what causes the head to split.

Posted on Mar 28, 2010

  • 15 Answers

SOURCE: My Karcher 2.99 starts and stops, (pulses) when th...

Is liquid leaking from the base, when the Pressure washer is on ?
I have the same Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A manufacturing defect.. A New Manifold Complete Replacement is $61.03, about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

Posted on Jul 13, 2010

  • 4 Answers

SOURCE: I have a Karcher K5.55M The motor pulses and only 1/2 pressure

In the video link above, at 7 minutes,.. through to 7 minutes 8 seconds,.. the guy talks about a "minute crack in the cylinder head". He actually means to say "minute crack in the control head". This minute crack is the main reason for this common problem: the pulsating and some loss in pressure on a wide range of Karcher waterblasters.
I got a replacement control head from my local Karcher dealer for NZ$50 that fixed the problem,.. for now :-( The below picture has two red ovals around the cracks in the control head that are very hard to see. If Karcher made this control head from an aluminium casting, their product range would be a LOT better. eade87d9-b4d8-4625-bd50-c466405ff2e3.jpg

Posted on Oct 20, 2014

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1 Answer

How do i stop it from pulsing?


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If you have a Karcher then you should always post your machines barcode.

Because you have the low pressure and pulse this will be the valve block. Your machine has 3 piston and each has 2 valves (inlet and outlet). Because you dont have the barcode, i cant be sure if you will buy a valve kit of 6 valves or a pre-assembled manifold block.

it could be this machine and spares :
http://www.sparesgiant.com/cleaning-equipment/pressure-washers/karcher/k-series-parts/k2-range/k2-36m16724300/

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I have a Karcher K3.540 pressure washer. Won't take up detergent and motor pulses ever second if vari-lance increased towards maximim. Motor runs ok at lower pressure but can take 1min to start wh


This fault is within the control head, under the detergent valve is a small spring loaded valve that acts to induce the detergent, this will have failed, the shaft of the component breaks off the disk base leaving a small hole in the centre of the disk. This is enough to allow pressure past the component. The machine will pulse when operated and will not induce the detergent. I've looked everywhere to find this part as I have a karcher with the same fault.

Jan 22, 2012 | Karcher Garden

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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

1 Answer

Pulsing when idle and when operating


I have the same Problem, there is a leak at a seam of the Manifold housing. There is a small crack in the seam. A manufacturing defect.. A New Manifold Complete Replacement K2.26* Part # 97501760 is $61.03, about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and if you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

Jul 12, 2010 | Karcher K2.26 Electric Power Washer

2 Answers

My Karcher 2.99 starts and stops, (pulses) when th...


Is liquid leaking from the base, when the Pressure washer is on ?
I have the same Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A manufacturing defect.. A New Manifold Complete Replacement is $61.03, about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

May 21, 2010 | Karcher K2.26MR Electric Pressure Washer

1 Answer

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.

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1 Answer

Loss of preasue and pulses in standby mode


Check the oil. This is what happens when it is low on oil with my pressure washer. Kind of a safety feature.

May 15, 2009 | Karcher Garden

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