Karcher 3.99 i pulsating - Karcher PSI Electric Pressure Washer

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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.

I fixed mine works good too, watch my video step by step i put it on youtube
http://www.youtube.com/watch?v=UFXSLOBL0Mg

karcher K6.80 how 2 repair

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

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

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.

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.

you have an internal crack in the out let head of the machine very comon in thease machine and not expencive to fix