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I have water coming out of the hose on my Karcher K 5.86 power washer but not at a high pressure. The pump seems not to be working as there is no noise.

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  • sparticusbro Jul 20, 2010

    How do i take apart the unloader to free the piston on my Karcher K5.86 pressure washer.

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The common problem is the water admittance valve that controls the pressure. When you open the trigger, the pressure drops and the valve allows more water to go to the pump where its pressure is boosted. When trigger closes, the pressure boosts and the valve prevents more wwater in, hence regulaating the pressure.

These valves stick, usually at the high pressure position and do not let more water in sufficiently to be pumped.

Dis-assemble the valve and clean the bore with crocus cloth on a dowel rod. Then replace the O rings in the valve with identical ones or get a kit of them. Lube the rings with plumbers grease and re-assemble...

You can find illustrations of the pump assembly online with google.

This should restore your pressure and trigger action.

Posted on Jul 20, 2010

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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

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!

Jul 31, 2010 | Karcher K2.26 Electric Power Washer

1 Answer

No high pressure water


I have a SIMONIZ S2000 electric. I bought the unit about 8 weeks ago used it once. On the second use yesterday the unit didn't work as well, the pressure seemed only a bit better than hose pressure and soap did not dispense at any pressure. SO.... after much thought I turned the hose/tap pressure down so that I only got about 2-3 GPM instead of the typical 5-6GPM normally coming out of my hose....... it worked! Soap dispenses and spay is way better! It seems that if if the inlet hose pressure is high the pump doesn't work as well... go figure.

Jul 01, 2010 | Karcher 1550PSI Pressure Washer

1 Answer

Pressur not costant


I have a SIMONIZ S2000 electric. I bought the unit about 8 weeks ago used it once. On the second use yesterday the unit didn't work as well, the pressure seemed only a bit better than hose pressure and soap did not dispense at any pressure. SO.... after much thought I turned the hose/tap pressure down so that I only got about 2-3 GPM instead of the typical 5-6GPM normally coming out of my hose....... it worked! Soap dispenses and spay is way better! It seems that if if the inlet hose pressure is high the pump doesn't work as well... go figure.

Jun 21, 2010 | Karcher K2.26 Electric Power Washer

1 Answer

Karcher G 3000 BH Engine Pumping Problem


This may not be a motor problem. It sounds like your pump is not working properly and the motor is just following the pump. First thing to do is check for leaks in the pump, wand hose, gun etc. It may also be a blown water seal inside the pump.

Aug 17, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Poor pressure and water comes out of the detergent hose


replacing the wand wont solve the pressure problems, its going to be the pump problems, pump create high pressure to the wand. hope that help

Jul 21, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Karcher Power Washer that surges up and down with water pressure.


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.

May 29, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

There is no power when you use the sprayer Karcher K2.89


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

Apr 22, 2009 | Karcher 2500 PSI Pressure Washer

2 Answers

Karcher HD 655 S Does not come up to full pressure


yes...check the check valve. A one-way directional valve, this part is also known as a DUMP valve. It opens when too much pressure builds in the hand wand (when not spraying water) in order to protect the pump, by returning the high pressure to its source reservoir. I suspect the DUMP valve is stuck in open condition (or nearly open).

Jun 10, 2007 | Karcher 2500 PSI Pressure Washer

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