Karcher K4-98 Elactric Power Washer,...When not in use the maschine is pulsating and when I press trigger on gun the maschine works fine but with very little preasure
I fixed mine works good too, watch my video step by step i put it on youtube
http://www.youtube.com/watch?v=UFXSLOBL0Mg
SOURCE: When I switch my karcher k4.97 washer on it just
Well, first the easy bit... the pulsation is caused by the leak, because the machine can't hold pressure when the trigger is released. The difficult bit is: what to do about it? Unfortunately, there are several different places where the leak can occur and, even with the cover off, it's usually impossible to be sure exactly where the water's coming from. In the repair shop where I work, we almost always replace every part that might be causing trouble without even trying to identify the exact source. To do otherwise will rack the labour costs up so high as to render the job uneconomic. We reckon that if you can't complete the job in 45 minutes it's not worth it. Sad really, but such are the realities of our economics.
Anyway, unless you are a really competent handy-person, this is probably a job you won't want to tackle for yourself. So your choice is either to live with it (and do whatever you can to limit the pulsating time - keep it working or switch it off immediately) or take it to a repair shop. If you are in the UK, Karcher head office can direct you to a repairer, and I guess the same applies in many other countries too.
If you do want to have a go at it yourself, post another message here and I'll give you as much guidance as I can (but there will be a limit to the amount of detail I can provide, as I can't get in to writing a complete service manual!).
SOURCE: Karcher k4.98 switching on and off
The machine has a pressure leak. Check for a cracked controll head or either a leaking outlet elbow. The machine will short cycle if the holding pressure can not be maintained
SOURCE: the motor is pulsing on and off without the trigger being pressed
It is probably sucking air on one of the connections or around one of the fittings at the regulator. You can also turn the pressure up allittle on the regulator, that might stop it also. Make sure the clamps on the hoses going to the regulator is tite. Also it could be that the regulator is just bypassing water and if it has air in it it will pulsate.
SOURCE: I have a karcher 495, it is puslating when it is
It sounds like there may be a pressure leak somewhere in the system. The machine cuts off when there is no flow of water past it. If it is leaking then there is intermittent flow. Which would make the machine run then stop continuously.
SOURCE: Karcher 360M pressure washer pulsating problem when idleing
Hello,
unfortunately these little units have this problem commonly, 9 times out of 10 it will be the plastic head or the plastic valve block on the unit will be cracked and leaking slightly... it builds up pressure then leaks out and tries to build up the pressure again and this just reoccurs over and over...
you can get this repaired but is normally about half the cost of a new unit, if the pressure is still okay i would probably recommend just keep using it until it proper dies...
If you do get this fixed, we have studied into this and believe the main cause of heads cracking is warm water say if your inlet hose is in the sun for a period of time this can cause the water to become quite hot or if the unit sits and water trapped inside the head assy freezes can also cause this.
Hope this helps
Kind Regards
Brad
Testimonial: "Thanks very much brado83. The cycling interval has now increased, so I am going to try to fix this myself.You have confirmed my part suspicions.Cheers"
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