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Why does my karcher pressure washer pulsate when on but idol?

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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

  • mc2000 Sep 07, 2010

    Hey Mike, what about pulsating when the water is on and the trigger is pulled?

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My K'archer 2400 was pump pulsing on a cycle. I removed the relief valve and hand worked the bore with fine emory cloth until it cleaned up. There was so much corrosion that the new o-ring wouldn't seal properly after I cleaned it. I wasn't about to buy a new housing so the solution I came up with was this, I took the smallest o-ring I could get in the bottom groove using it as a shim. Then I put the proper o-ring in the groove next to it. Used a little silicon grease and pressed it back into the bore. This worked for a good while, until I made a .020 teflon shim and replaced the small o-ring. But it didn't stop I just finally got around to making the shim. the aluminium that is used for the body isn't a high grade making it more prone to corrode especially with the hard water here. So I always flush it after use with my house water that is filtered. hope this helps. I also re-surfaced the six teflon valve stems. I did that at home with my chain saw file and cordless drill, if anyone would like to see how that's done I could make a video.

Posted on Oct 04, 2013

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Dec 31, 2009

  • 2468 Answers

SOURCE: My Karcher pressure washer pulsates

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

Posted on Sep 12, 2010

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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.

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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

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

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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.

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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.

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

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