Karcher Pressure Washer Cylinder Head

Stock Number: ES538413

Manufactured by Karcher

In Stock Available for immediate despatch

Rated 4.8 out of 5 (87 customers)

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Karcher Pressure Washers


Pressure Washer Cylinder Head

If your Karcher isn't reaching high pressure, and you've noticed the trigger is "pulsing" this could mean you need to replace the cylinder head. The valves in the cylinder head can become blocked and clogged, reducing the tension needed to be able to use the washer to its full potential. 

  • Comes complete with piston seals

This is a genuine Karcher spare, suitable for select appliances in the model fit list.

Please note: For certain models the spare is serial and chassis number dependent. Please contact our call centre with this information so we can advise if the part will fit. Your chassis number will look like: 1.504-604.0, and the serial number will be 6 digits long.

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Product Reviews

Rated 4.8 out of 5 (87 customers)
Write a review
  • Pulsing Washer

    • 5.0 out of 5
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    By - Ross-on-Wye

    Very good service. The parts arrived within 24 hours. Had to order the cylinder head and the control head housing to solve the problem, but I now have what seems to be a new washer. This is not a task I would recommend to anyone who hasn't a degree of engineering knowledge. It is quite tricky in some places, but saved me the cost of a new pressure washer.
  • Pressure Washer Cylinder Head

    • 5.0 out of 5
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    • 5.0 out of 5

    By - ireland

    great service didnt fix problem but thats not espares problem
  • Karcher trial and error

    • 4.0 out of 5
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    • 4.0 out of 5
    • 4.0 out of 5


    Once you get used to taking these machines apart it gets so you could do it in your sleep. My K3.99M first developed a burst inlet elbow, which was easy to replace; then a leak from the cylinder head caused by a split grooved rubber ring. Replacing all three rings fixed the leak but the machine seemed to be down on pressure power i.e. it didn't clean paving stones as well as it did before. I thought that maybe the cylinder head bores may be worn or the valve springs weak so I bought a new cylinder head. Is it fixed? No it isn't. Still low on pressure, only now the motor runs constantly without operating the trigger, which seems symptomatic of low pressure. That's what I mean - trial and error. Where next, I wonder. N.B. water supply is ok.

Ask & Answer

(23 Questions and 22 Answers) Ask a question
  • Q Ive lost oil changing a pressure washer cylinder head, how and what do I repace it with!i 3 Answers

    By Softy - Kent - 02 June 2011

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      Ref Colbee comment. We mistakenly stated that electric pressure washers do not contain oil. The link given to Stock Number: ES538165 is an oils approved for pressure washer pumps and is suitable.

      By Chris eSpares Staff - 20 June 2014

    • A
      Sorry, I'm a latecomer to this post, but I beg to differ with the response by staff-member Rory on 3/6/2011 who stated that an electric washer does not need oil; surely, in an electric washer, the swash plate chamber contains oil which is easily lost if the retaining bolts are loosened/removed and the motor is not kept upright.

      By colbee - Manchester - 19 June 2014

    • A
      Hi Softy, if you have a petrol pressure washer, the oil you need to use to keep the engine lubricated can be found here: http://www.espares.co.uk/parts?k=pressure+washer+oil. If you have an electric washer, you won't need oil.

      By Rory eSpares Staff - 03 June 2011

  • Q do i need a new cylinder head 2 Answers

    my pressure washer does not reach high pressure when trigger is pressed and pulses when not being used. is the problem the head, valves or a rubber seal?

    By tintin1 - doncaster - 24 August 2009

    • A

      By gtoj7lav - Scotland - 03 November 2009

    • A
      The Head, was the problem on my pressure washer/karcher.High pressure back.

      By joe12345 - 29 October 2009

  • Q We need the bit that actually attaches to the cylinder head. 1 Answer

    The part that attaches to the cylinder head has burst due to frost damage. Is this bit available as a spare. At least our cylinder is much bigger than the bit in your image. Can you advise.

    By Gav - Ayrshire. - 24 December 2014

    • A
      In order for us to answer your question or source the exact part you require please provide us with the following information: Appliance make, model and serial number of your appliance. For further help visit the "Finding Model Numbers" page on our website here: http://www.espares.co.uk/findingmodelnumbers. Alternatively please copy and paste this link into your web browser.

      By Chris eSpares Staff - 29 December 2014

  • Q I have a K4-600 PRESSURE WASHER used it once all was fine puy it away for a few months next time I came to use it it was leaking a lot of water and pulsating very badly, bear in mind this was used only once . i cannot see what is causing the problem. 1 Answer

    By len - 26 November 2014

    • A
      It pulses because the high pressure that turns the motor off leaks away. unplug and remove the case. just connect the hoses and identify the area it is leaking. Replace that part to resolve your problem.

      By Chris eSpares Staff - 26 November 2014

  • Q symptoms are motor pulsing, low pressure, sounds like i need a cylinder head, but what else might cause same symptoms? 1 Answer

    K 3.575, not very old but ran briefly without water supply when hose fitting blew

    By richard - pl124er - 11 November 2014

    • A
      It is likely if the problem occurred immediately after running with no water that the seals of the pump have been damaged and this part should resolve your problem.

      By Chris eSpares Staff - 11 November 2014