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Karcher dirtblaster does not oscerlate the water.

I have purchased a second hand Karcher 4040 pressure washer, after a few months of use the lance failed to osceralate the water around and just stays in one position.

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  • rooville Mar 28, 2009

    I have the same problem with my dirtblaster lance on my Karcher K 2.91M. One day it worked fine, and the next time I used it it won't spin the water - just comes out in an angled stream. I've dismantled and cleaned the nozzle assembly, but no luck. My Karcher is only about 1 year old, but I've heard that these Karchers can wear out quickly and lose pressure. Maybe pressure loss is causing my problem?
    Any advice? Anyone?

  • Anonymous Apr 06, 2009

    i HAVE EXACTLY THE SAME PROBLEM WITH TWO LANCES. The session starts with stop start working which cant to the pressure washer any good. The jet then slowed in rotation until fixed. Giving the unit a tap on the ground seemed to help

    The Karcher lances dont seem to last very long but are effective on paths and patios etc

  • scott1744
    scott1744 Jan 08, 2012

    I fixed mine after it had exactly the same problem. Firstly I unscrewed the head assembly and cleaned out the holes with fuse wire (which did not change the problem but eliminated one possible cause) - I then noticed a single o-ring on the white plastic assembly in the nozzle itself - there was only one o-ring but two grooves to support o-rings. I moved the o-ring from the position it was in furthest from the nozzle to the position closest to the nozzle and the lance is now working beautifully.

  • Thierry Mattea
    Thierry Mattea Jan 25, 2016

    Purchased my Karcher brand new with the Dirt Blaster nozzle. It worked fine the first 2 times I used, then the typical problem of no oscillation reared its' ugly head. After trying all the suggestions (solutions) mentioned below, I still couldn't fix it, which is weird since the nozzle could not have been exposed to enough wear and tear with just 2 uses. I figured i got a defective product (it happens from time to time), so I bought a new replacement oscillating Dirt Blaster tip from the local Karcher dealer for $40. Worked fine the first time I used then the same problem reappeared. Now I've given up on the damn thing. You pay a premium price and buy a German brand thinking you're buying quality and reliability and you end up with the cheapest possible product you could possibly buy. Karcher is a piece of ****. NEVER EVER BUY this brand if you value your hard earned money. A chinese pressure washer for half the price is 10 times more reliable, and in case it's not, at least you won't feel like you've been duped by false claims of unsurpassed German quality!


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Stripped down the head of the dirt blaster by unscrewing the shaft from the end nozzle(it was quite tight). Removed the white disc from the nozzle using pliers and then cleaned out the 4 holes in the disc. Under the disc is an assembly which houses a ball bearing. I noticed that the ball bearing did not protude beyond the recess which houses it. I PUT TWO SMALL FIBRE WASHERS IN THE RECESS THEN REPLACED THE BALL BEARING. THEN REPLACED THE WHITE DICSC. Noting that the ball bearing protrude by approx 1/16th of an inch.
Re-assembled and the dirt blaster now works perfectly

Posted on Jun 20, 2013

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  • sujith reddy
    sujith reddy May 01, 2014

    holdden, i couldn't pass the first step itself....separating shaft from nozzle...its very tight ...can you help me with this ... i'm also facing the same problem ... thnkyou !!

  • Reyaz Amin Malik
    Reyaz Amin Malik Sep 27, 2014

    The procedure was hekpful, but there is another issue. Once the accessory is used, everytime it need to be removed from the handle and drained, otherwise it does not work as revolving. it seems the assembly inside gets water sealed. any suggession.

  • Jamie Mahoney
    Jamie Mahoney Apr 14, 2015

    To unscrew the nozzle use an adjustable spanner on the end that goes into the lance body and clamp mole grips to the knut shaped end of the nozzle body then twist.....hard.


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I fixed mine after it had exactly the same problem. Firstly I unscrewed the head assembly and cleaned out the holes with fuse wire (which did not change the problem but eliminated one possible cause) - I then noticed a single o-ring on the white plastic assembly in the nozzle itself - there was only one o-ring but two grooves to support o-rings. I moved the o-ring from the position it was in furthest from the nozzle to the position closest to the nozzle and the lance is now working beautifully.

Posted on Jan 08, 2012

  • David Hill Jul 26, 2012

    Thanks that helped. Where does the ball barring go? Dave Hill

  • Ed Fig Apr 05, 2013

    Did you get an answer? I am looking to find the diagram.


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The lance is either blocked or worn. Unscrew the end of the dirtblaster and ensure the is no dirt inside. If this does not work replace the lance assy.

Posted on Mar 06, 2009

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