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My Karcher pressure washer pulsates and the water pressure is not as good as when I first got it

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  • Master
  • 2,468 Answers

Your pressure bypass valve is leaking water pressure by and not building full pressure

Posted on Sep 12, 2010

  • Brian Gautreaux Oct 16, 2010

    Man what a genius answer without a solution, *****.

  • M. Ryno Nov 20, 2010

    How do i fix it?

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Posted on Jan 02, 2017

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Mike258
  • 1498 Answers

SOURCE: Why does my karcher pressure washer pulsate when

Hi Richard,

If by pulsate you mean the engine R.P.M.'s rising and falling, this is natural. It's the result of the engine reacting to the sudden back pressure in the pump by idling down.

The engine continues to maintain a constant pressure on the water cycling inside the pump while idle. It cycles within the pump because water can't be compressed. If there was no place for it to go, the weakest seal would blow or the engine would die.

When you pull the trigger again the pressure is no longer bogging the engine and the R.P.M.s smooth out.

Also, it's not good for it to be running for any extended length of time without water or the trigger being pulled.

Hope this answers it

Best regards,
Mike

Posted on May 02, 2010

  • 1 Answer

SOURCE: my karcher pressure washer has lost its water power

I have the same problem. With mine I have to remove the tip that I am using then pull the trigger and then replace the tip and pull and pressure should return. I believe that one of my valves is sticking causing me to reprime the pump frequently. I am trying to clean or replace my valves to fix the problem.

I hope this helps.

Posted on Apr 25, 2009

  • 174 Answers

SOURCE: poor pressure

i had this same problem on my pressure washer.the pump had some broken parts in it .i found my replacement pump on EBay.

Posted on May 31, 2009

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1 Answer

Why does my Karcher pressure washer Pulsates when switched on also leakes water.


Hi,
Shame you did not leave the model type of "Karcher" pressure washer as there are several models.
There is normally a special oil which should be changed, expect this to be done at least every three years or less.
1/. These pressure washers should only be serviced or taken apart at one of their registered dealers, as far as pulsating if you have the cheaper models then they do not last very long.
2/. Their better more power washers pulsate all the time & that is why they are sold new with a special fitted container, this allows all the pipes & water connections to fit & hold in supplied container, which allows you to give a higher or lower power controller where their yellow pipe that attaches to the gun fits on the machine.
3/. Where the pressure pipe goes into the power washer it has a black knurled fitting to adjust the pressure higher or lower out put, this is the only adjustment you can make on these power washers, everything else needs to be done by their approved dealers, situated all around the world, try finding your nearest dealer through the Internet. Hope this helps. Malcolm.

Feb 07, 2015 | Karcher Garden

2 Answers

IT HAS PRESSURE BUT IT PULSATES INSTEAD OF STEADY SPRAY


I have same model with same problem. Tried the easy fixes:
unloader valve lube and clean, inlet water sufficient, and nozzles and hose are fine. Broke down pump and called for parts (about $50 for 3 inlet valves and some seals) hopefully this will fix it. Mine has been used in my business pretty hard for a few years, so not bad.
Joebro

Jun 11, 2011 | Karcher G 2600 VH Gas Pressure Washer

1 Answer

My karcher 250 pulsates when i turn it on, any idia how to fix it thanks


My karcher 250 pulsates when i turn it on, any idia how to fix it thanks

Several things can cause this problem. It is trying to build up pressure and something is preventing it.

1. check water pressure comming out of the the spicket.
2. Make sure the hose and connectors aren't leaking.
3. make sure there isn't any water leaking from the washer.

If all is ok I would guess the pressure pump has gone out that's the noise you hear pulsating trying to build up pressure.

Terry

Jan 15, 2011 | Garden

2 Answers

Pulsating when idle


The motor doesn't pulsate when you are spraying and pulsattes when not spraying is normal otherwise the pressure will just keep building and burn out the pump. However, if you are not using the sprayer right away then the unit should be shut off until your ready to start again.
I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

Apr 03, 2010 | Karcher K 3.98 M Electric Pressure Washer

1 Answer

Pressure washer is pulsating when powered on


it just the presure building back up ,it will last years doing this,i would not worrie as replacing the presure pump will only be a temp fix and it will do it again ,most washes do this after a year or lots of use.

Dec 31, 2009 | Karcher 1750 psi Electric Pressure Washer

1 Answer

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

Dec 16, 2009 | Karcher PSI Electric Pressure Washer

1 Answer

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.

Nov 15, 2009 | Karcher K 5.85 M Electric Pressure Washer

1 Answer

Poor pressure


i had this same problem on my pressure washer.the pump had some broken parts in it .i found my replacement pump on EBay.

May 29, 2009 | Karcher 2500 PSI Pressure Washer

2 Answers

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.

Mar 14, 2009 | Karcher K2.26 Electric Power Washer

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