Karcher Pressure Washer Cylinder Head

Stock Number: ES538413

Manufactured by Karcher

In Stock Available for immediate despatch

Rated 4.8 out of 5 (97 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 (97 customers)
Write a review
  • Easy fix for leaking pressure washer

    • 5.0 out of 5
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    By - Monmouthshire

    My 10 year old KB402 sprung a leak. Ordered a new head complete, fitted in 10 minutes and back working as good as new. Well pleased.
  • Perfect

    • 5.0 out of 5
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    • 5.0 out of 5

    By - Sweden

    Works perfect, easy fitting and fast shipping to Sweden.
  • Pressure netter

    • 5.0 out of 5
    • 5.0 out of 5
    • 5.0 out of 5
    • 5.0 out of 5


    Product as described and very easy to fit, did the job

Ask & Answer

(25 Questions and 28 Answers) Ask a question
  • Q Ive lost oil changing a pressure washer cylinder head, how and what do I repace it with!i 5 Answers

    By Softy - Kent - 02 June 2011

    • A
      Can we just clarify Rory's previous answer. Electric pressure washers do not generally require the gearbox oil to be topped up or replaced during there normal working life. However if during disassembling the machine oil is allowed to spill from the gearbox it is important for this to be replaced or the gear box will quickly wear and fail. Sorry for any confusion our previous answer may have caused.

      By Chris eSpares Staff - 15 July 2015

    • A
      You can buy Karcher oil at, I believe, £34 pounds odd a litre, or use a good quality multigrade engine oil, which is just the same. Look on Youtube under Karcher repairs.

      By D.R. - Sheffield - 14 July 2015

    • A
      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 symptoms are motor pulsing, low pressure, sounds like i need a cylinder head, but what else might cause same symptoms? 2 Answers

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

    By richard - pl124er - 11 November 2014

    • A
      If the seals look okay you may have a tiny crack in the cylider head or the control head, especially if you have ever let it freeze. Basically if there is no external water leak you have an internal pressure leak - a valve or crack is most likely. Cylinder head eliminates most things as it is a complete assembly and very inexpensive. Control head is next most likely for an invisible leak, but is not so inexpensive, and more individual to the models. You can run these for several seconds without water supply without damage, and as the topseals are in the cylinder head assembly this is well worth a try.

      By D.R. - Sheffield - 14 July 2015

    • 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

  • 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 Pulsing and poor spray 1 Answer

    K5 unit only couple of years old if that seems fine using dirt blaster but today using the vario gun the spray is really poor and uneven and the pump pressure seems low and its pulsing . Never done this before checks filter , fgun is clear , any ideas where to start , gun or pump

    By Dave - Shropshire - 20 July 2015

    • A
      Check the filter on the inlet is clean and the water supply is sufficient and no air leaks. If the problem continues try another spray head as this may be due to dirt restricting the spray nozzle. If still unresolved and no leaks suspect cylinder head seals.

      By Chris eSpares Staff - 21 July 2015

  • Q My K4.91m Is hunting water coming out the bottom of machine 1 Answer

    Water coming out the bottom of machine loss of power any ideas please

    By Pete - Spain - 28 April 2015

    • A
      The hunting is caused by pressure loss from the leak. This is usually due to a split in the cylinder head.

      By Chris eSpares Staff - 28 April 2015