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Karcher Power Washer -power is intermittent. it fires up, goes for maybe 10 seconds then loses power/pressure. Does not seem to get to full power.Water is flowing at all times, but power comes and goes.

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Sounds like the unloader is cruddy with mineral deposits and sticking, if you pry off the silver cap, remove the black cover, use an Allen wrench to remove the two "star" screws (or you can remove the four engine mounts and remove the whole engine), lift out the white plastic part with the brass needle & spring, finally lift out the stainless steel piston or start up the engine (make sure you have the water hooked up and running) and watch out for the piston as it will shoot out ( placed a towel over the piston before starting the engine). Then you can put white lithium grease all over the piston and reassemble

Posted on Mar 13, 2011

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Posted on Jan 02, 2017

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Karcher 2500ph pressure washer spill valve has been replaced pull wand trigger pressure good for 3 or 4 seconds drops off for a second or 2 goes back to good pressure for 3 or 4 seconds drops off again for...


If you have a Karcher then you should always post your machines barcode.

full article on nozzles :
http://repairshed.blogspot.com/2013/09/pressure-washer-lance-nozzles-what-you.html

The spill valve operates at approx 20% higher than specified pressure washer operating pressure. If you have any lance issues then the pressure could be running higher than specified (machine running at same pressure as spill valve operation pressure)

your machine produces a fixed flowrate of water (maybe 8 litres per minute) and your nozzle is a fixed size. the diameter of the nozzle determines the back pressure. A piece of debris could further close your nozzle orifice and increase the back pressure. Using a new lance that has the wrong nozzle fitted can also cause this issue.

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....

Aug 15, 2013 | Garden

3 Answers

Does not give a continous high pressure flow cuts in and out


that is sure signal of insufficient water supply!

try easy solution first:
make sure that your mains is fully open, that tap on whihc hose is hook up is fully open and hose is of "decent" diameter to allow sufficient flow.

if above solution do not work then you need to make another, more difficult arrangement:
prepare 20litres pressure tank with inlet connected to mains and outlet by short hose to power washer, fill it with water from mains, keep it under mains pressure and use karcher power washer normaly. this will solve water supply problem. twenty litres will last about 2min, because it is re-filled, under standard pressure therefore it will last about 3min...

third possibility is to stop washing...

if you find my advice helpfull, please do not hesitate to left the comment and vote for me, thanx!

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1 Answer

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The water must be switched on, and seen to be running freely from the nozzle for a few seconds before switching on the power - suggest you check the fuse in the plug, and then try the above.

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Before you start it up:
1. Disconnect the high pressure hose 2. Connect the water supply and turn on 3. Make sure water is flowing through the pump
Start the motor, run for about 10 seconds and then turn off.
Turn off the water supply, connect the high pressure hose, turn water back on, start the motor and away you go.

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They have a problem. I removed both valves and lubed with lithium grease as I was told. Unit is now working for how long who knowes.

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NEW KARCHER KB6060 ONLY RAN FOR 10 MINUTES


Take it back to Argos. They will either replace it or give you a full refund, no questions asked. That's my experience anyway.

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Karcher power washer electric K3.97 gun has two springs can not find where one goes.


have a look on karcher web site
www.karcher.com
click on europe
then click in international
go to service then spare parts
put in k3.97 and have a look.
hope that will help
damian

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