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How to repair a karcher pressure washer keeps pulsing

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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

  • 92 Answers

SOURCE: trouble with Karcher Pressure washer

Dear Pgarciax,
It is important that you must have mentioned the model number of your Karcher. Just the same I can surely say that your machine's fault lies in the "SPILL VALVE"
When the gun is open and pressure is being produced, the spill valve is in a relaxed position. Also it has at the bottom a valve, which when pressure is produced it is closed. If this does not close due to dirt or corrosion, the pessure goes down. Now when you close the gun,pressure forces the spill valve down to close the electrical system. Now if the "o" rings of the spill valve are damaged, the machine will start going on and off while in stand-by. So if you know how to locate the Spill Valve, all one has to do is change it with a new one.
In some Karcher machines there are 2 spill valves. One regulates pressure and the other one is for switching off the machine when the gun is closed.
Low pressure could also be due to faulty suction or delivery valves. Most probably the suction valves.
But when saying that there are short interruptions while in stand by, I stick to the fact that the spill valve needs renewing.
Regards,
MG.

Posted on Nov 19, 2008

  • 10865 Answers

SOURCE: Karcher Pressure washer surging/pulsing

here is a troubleshooting link for Karcher products

http://www.the-power-washer-advisor.com/electric-pressure-washer-troubleshooting.html

Posted on May 31, 2009

  • 32 Answers

SOURCE: Karcher Motor Pulese On and Off

hi mark, you do have a problem with the lance.
you need to disconnect the lance and straighten a paper clip and insert down the nozzle end.
use the machine to wash the dirt in the nozzle backward down the lance.
Dirt only in nozzle end.
if still no good, purchase some nozzle cleaners and file out nozzle very slightly.

Posted on Jul 04, 2009

  • 1 Answer

SOURCE: Unloader Valve - Karcher Pressure Washer

where is the unloader valve locaed on a Briggs Stratton pressure washer?

Posted on Oct 03, 2009

  • 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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I have no pressure and the pump surges when i release the trigger on my electric karcher modle k 2.360


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/

The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

Sep 01, 2013 | Karcher K238CCK 1600 PSI 13 GPM Electric...

1 Answer

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

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

1 Answer

Hy; I have a karcher 580 I had to replace gun complete so I bough a simoniz xe01-001 at simoniz.osirus.ca/ for your info 69$ complete ***.I install NOW I get pulse up & down ONLY when trigger is press...


Most likely problem is that the tip is too small causing Unloader to bypass or restriction/debris in tip. Install clean tip of proper size or 1/2 size larger (example from 2.5 gpm to 3 gpm ) to prevent slow pulse. If tip is clean and /or larger tip does not help, Unloader may be failing if the unit has a good deal of hours or if machine is left running for long periods of time without spraying. Try lubing the internal parts by removing both hoses and installing a short piece of water hose to intake and slowly inject light oil into pump by pulling on the rope slowly to **** in the oil until it comes out the pressure side. This will displace all the water from inside the pump. Leave overnite. There is a kit sold on ebay to help facilitate the infusion of oil but no need to get fancy. Unloader repair kit is usually available if all else fails and is easy to install. Good holidays

Dec 12, 2010 | Karcher 2500 PSI Pressure 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 pressure washer keeps pulsing when not in use and has lost pressure when in use


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.

Mar 28, 2010 | Karcher Garden

1 Answer

Pressure keeps going up and down


you might have some dirt in the valve ( if the hose is shaking then check them.)

Oct 20, 2009 | Karcher Garden

2 Answers

Karcher KB 499


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

Feb 17, 2008 | Karcher 2500 PSI Pressure Washer

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