Question about Karcher PSI Electric Pressure Washer

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My Karcher high pressure sprayer is delivering intermitant pressure.Every 15 seconds or so it developes high pressure for only about two seconds. Why is it not delivering a constant high pressure stream?

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Check that the water supply is constant , it sounds like the pump might be pushing out more water than can be delivered , or it could be a dirty inlet filter

Posted on May 23, 2009

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I HAVE AN OLD, ABOUT 15 YEARS,PRESSURE WASHER MODEL 270M. RECENTLY IT STARTED TO PULSATE WHEN I ACTIVATED THE WAND CONTROL. IT PULSES AT THE RATE OF ABOUT 1 SECOND INTERVALS. IT WILL NEVER STOP AND RUN. I...


To me this problem sounds like there is something wrong with the pump.
I think its better to buy another Karcher machine and get the 12 month warranty. As with old pressure washers you could spend money on certain parts to fix the machine but a few weeks/months down the line a different part of the machine could break and then you end up having to buy a new machine anyway.

Also being 15 years old you would have to check to see if parts are still made for the machine. This is because once Karcher discontinues a machine parts for that machine are manufactured for 10 years from that discontinue date.

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2. Pull out the thin Plastic Hose with the filter attached in the end, and insert into your container of detergent.
It will only splatter the detergent over the area you want to clean, so you will then need to REATTACH the SPRAYER into the hand gun to work with the soap to lather, clean and spray of till clean.
This seems to be the way the system works on this model......also known as K2.36M (AU) in Australia or (EU) in Europe on the Karcher.com.au site then Service then Manuals. or on the link below.
Hope this helps any of you who has misplaced their Owners Manual just like I did and had a great problem trying to find a link as Karcher doesn't recognize the Model No: as Winner 10 or 11.

Cheers, Luke

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The spill valve needs to be removed and the side walls of the hole it sits in need to be wire brushed to remove deposits. then you can put it back in and put the pump back together.

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1 Answer

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On the Kärcher, you have a bayonet mount at the base of the tip end of the pistol grip. This is where you attach different types of nozzles and gadgets after having removed the existing sprayer tube. Just push in and turn a quarter of a turn, then you pull it off the pistol grip. The hose is possible to remove from the machine as well, an ordinary threaded mount but since you need the pistol grip to regulate on/off this is probably not what you want to do. If the telescopic wand is made by Kärcher it should be very easy to snap it into place just like when you removed the sprayer tube/nozzle. If the attachment was made to fit Alto washers there is an inexpensive adapter that works very well. Good luck!

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1 Answer

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Depends on the model, but it is probably the pump, Most Karchers do not use expensive pumps. Also, if the end of your hose is off, you won't get much pressure either as it takes a restriction in the end of the hose to increase the pressure. I have commercial pressure washing business & occasionally have an hose end come off, pump problem or high pressure switch problem, but all this stuff can be fixed. Hope this helps you, Rick

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