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I have a karcher K3.98 pressure washer. The unit surges when I put the wand on and then it stops working. I tried cleaning the wand (didn't make any difference) I then tried another wand from my son's unit (still didn't work)I am wondering if the unit is worn out or can you suggest what is wrong? Thanks davedulmage@sympatico.ca

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  • davedulmage May 21, 2009

    Thanks very much I have taken the pump apart and checked everything and everything looked good however I did not check the valve in question. I will take it apart again and replace the valve.



    Thanks again

    Dave Dulmage

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Dear davedulmage,
To see if the unit is OK....first you must switch it on without water and without high pressure hose and gun. If machinr works smoothly, try by attaching a water supply. Now run the pump with water coming out of the outlet. If also in this case all runs smooth, then attach high pressre hose with gun but without lance. Put on the machine with gun open(to reduce initial resistance) and when you see a clear flow of water coming out...close the gun. The machine should stop. In this case I am suspecting that when you open again the gun the machine will not work. So it seems that when pressure is built in the pump a fault is occuring in the Spill Valve or also called Control Valve. When the gun is closed and pressure built up, this spill valve contracts and switches the pump off. When the gun is opened, the spill valve extends, putting the machine on and closing a valve at the base of the spill valve. So in your case it seems that the spill valve needs to be renewed. A spill valve gets stuck by incorrect using of the pump. For example leaving the pump with pressure in it for a long time. Also it gets stuck by detergents and chemicals. Sometimes I lubricate Spill Valves with high quality silicon grease....but it is much more practical to change it. When a new spill valve is put in....always run the pump with no load. This by usiing the gun without lance or wands, resulting in low pressure. If all OK...add a lance or wand that you are sure it is good. One final thing....to get to this spill valve you must put apart the body and expose the pump. If you are not that good at doing this job...it is better done by a more knowledgeable person. But changing the spill valve is worth it....because it is cheaper than a new machine.
Regards,
Fulltech.

Posted on May 21, 2009

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Replace the control valve.

thanks to Full Tech

Dave Dulmage

Posted on May 21, 2009

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