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Karcher 3.99M replaced cylinder head but still pulses

My 3.99M leaked, pulsed on standby and lacked pressure changed cylnder head with Karcher part, no leak but still lacks pressure and pulses. Any suggestions Regards Gerry

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6ya6ya
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Posted on Jan 02, 2017

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Coldcut
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SOURCE: karcher pressure washer leaking oil

all 4 stroke engines have oil, and 2 stroke can have a oil mixer reservoir to mix with engine gas or to lube the chains , gears, pumps.
If yours is 4 stroke as likely then the oil may be leaking at the seals to the main. (bad news)
Pressure wash it (lol) and locate the leak,
to speed up the leak you can pump some compressed air into the engine (be creative)

Posted on Apr 13, 2008

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  • 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

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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

  • 1 Answer

SOURCE: Karcher/Winner 11 - motor pulses when hose is not operating

Hi, I had the same problem, Replaced the O rings and the rubber seals and cups inside the pressure washer and eventually the hose itself burst. Turns out the hose was leaking, internally between the inner sheath and the outside plastic cover, for quite some time and this caused the pulse. New hose and pressure cleaner is as good as new.

Posted on Mar 12, 2010

  • 15 Answers

SOURCE: I have a Karcher KB5050 it started to pulse when

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.

Posted on Jul 13, 2010

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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

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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

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

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

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

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

2 Answers

Leaks from within when operated (not from hose connections).


If the motor runs continuously, rather than pulsing on and off, then this points to a major leak rather than a simple seal failure. If there's any possibility that the machine has been subject to frost, then part of the high pressure system may be split. This is not as bad as it sounds, as even replacing the whole cylinder head and control head assembly is not unduly expensive.
Having said that, I have seen one machine recently with this problem where the only thing wrong with it was that a joint between the pump head and the high pressure hose connector had simply come apart (shouldn't be possible, but it had).
If you need more help, please post again with details of the model number.

Mar 21, 2009 | Karcher Garden

1 Answer

Hi,karcher hds hot pressure washer now pressure when you pull trigger and pulses.


what you need to do is, take the screw fitting which goes to the water tank off, then the one that goes from the water tank to the pump head .
then put the one that was in the first place going to the water tank on to the pump and force feed with water.
see if you can see water leaking from any where seals hose.
try running the machine to check the pressure.
if water leaking from pump head you need seals.

Mar 21, 2009 | Karcher Garden

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