Hello its been a couple of years so may not be relevant. I had exact same problem as you. Watched your first video, Ordered the part and the same result as you. However i noticed on the old head there was a small triangular bit with a spring that didny come with the replacement. I have no idea what it is for but i swapped it over and it worked. Thank you for your videos.

That little piece of plastic that you installed at 19:50, it is made for older models of karcher to be compatible with newer pump head like yours. So you dont need it, because your karcher is newer model. I made that mistake myself, now my karcher works perfectly!

If you discharge the water from pump head before shutting it down you won’t get a cracked pump head in winter!!!

Thanks for uploading this video. This is the only video I found that demonstrated exactly what I wanted to do - which was remove the main cover of the K4 Full Control model. No other video can I find that shows what you do so massive thanks for that. I'm guessing it's a K4 Full Control because it looks identical to mine. There were two screws that I couldn't see stopping the case being removed but once they were unscrewed, the main casing came off easy. I wanted to try to do something with the on/off switch or the component that houses the power on/off switch -- because as soon as I power on at the mains supply my K4, the pump starts/runs, making a humming/buzzing sound. It works fine when you squeeze the trigger to spray water but as soon as you release the trigger, my K4 pump keeps running even though the water stops immediately. Without taking the pump out of the casing which is the only way to access the on/off power unit, I believe this is the fault. It seems a big job to do this just to access the power supply unit and I was hoping I could disassemble this to inspect it for a failure I could repair myself. Below is a link to the part I think I need to buy -- unless you or someone can tell me if this is repairable. www.ebay.co.uk/itm/265380556280?epid=11053062648&hash=item3dc9e9edf8:g:Dz0AAOSwLAxheoym&amdata=enc%3AAQAHAAAAoD6sujnDl8fW8q5oDXmvzG%2BAbIRKSznad%2FeALMpspYPmFp5JTHzkPJmE5KWj2n5Pchej3OpRlAKoncT%2BqPZtSmX3tmh7FqGf3JqQbRRnTzRpcQlrfOsIfvfxgnHBk9Iq8YL9%2FNBbM98a1ypVAr%2BAcqFVqmfEv7yg3xetvEGSjnQ6gDtzDyAh5JD2JPpRXXUvQXvoQSIXIKRFb4NzG6aQpeI%3D%7Ctkp%3ABk9SR6bj0snAYQ

That was more helpful to see it getting taken apart, not enough swearing for me as I put myself in your shoes so there's a gid few fkrs and btsrds getting flung aboot when yae drop things, I was thinking of doing the very same video as advised by your good self, like you I have breathing issues but also MSG so there's a lot of shaking going on so video would be quite long haha but we'll see you never know,anyway keep up the good work, me and the wife were trying to work out you accent thinking up Aberdeen way 😃👍

Your the man 👍

Hello mate enjoyed vid keep them coming nice one 👍

Hi At 15.29 you pull a brown plug and all the bits fall on floor,and you say your sure their was a spring in their. Was their a spring ? I'm in process of repairing exact same machine and same thing happened to me. I've put the machine back together and I'm left with a spring 😂😂,.

@Random Therapy ... I've got a question and a suggestion. When you're taking off the top section; whatever it's called ... the part you're removing to replace. You mention in your video there are Allen Bolts to undo (there's four of them), they're definitely Allen Bolts? NOT Torx Bolts? What size Allen key head did you use? The biggest Allen key I've got fits inside the bolt head but it has a slight wiggle so it's not a perfect fit. If I try to use the Allen key I've got, as those bolts are extremely tough to undo, chances are my Allen key will cam out and possibly round or damage the bolt head. Secondly, I have an idea to ask you. The short clear pipe (about 5 inches long) that connects from the top housing that goes to the black plastic holder that you push in a special fitment bottle such as foam or detergent ... what if this pipe was replaced with a pipe that was say 2ft long or even 1 meter long. If I then drilled a small hole in the side of my K4 and fed that extra length pipe through, if the pipe was left open ended, I could then just put the open end directly into a bottle of something into even my own bucket filled with something I've already mixed. I know inside that short pipe are a couple of tiny balls which are there to reduce the pressure when this is being used. Providing in torment careful not to lose them, I think my idea would work?

Hi Mate, just wanted to ask you if you managed to fix your Karcher K4 leak from the plastic piece under the metal piece. I think it's called a controller or manifold. I have exactly the same machine with the same issue. Thank you in advance.

you fotgot to put that inner small triangle part under the top plastic cover, which you had to use from the broken one last time kzfaq.info/get/bejne/a5uDY8Zom62VqYE.html probably some pressure regulation

Did you put a v cut into the plastic first

Hey buddy, it seems i have the same problem as you have ended up with after replacing the parts. Washer wont built to pressure, did you find out what the issue was? Or was it launched out garage as mines is close too 😂

I want to take out the white box that houses the electrics to see if I can open it up to check if this is the part that is at fault with my K4. Regardless of whether the on/off switch is in the On or Off position, as soon as I connect my K4 to mains power, the pump starts running. Carefully watching you take apart your K4, when you show the component that you say sits on top of the pump (which on mine has a short clear tube that connects to the part that allows you to push in a detergent bottle), did you remove the pipe that goes through into the back casing where the high pressure hose connects to BEFORE you made this video? I don't see you removing that and without removing that you cannot remove the main pump out of the rear casing. All I see you do is use a screwdriver to remove two clips. On my K4 there is only one clip. That holds in a black solid plastic pipe from the main pump into the part you had in your hand. I'm struggling to remove the large black holder that you wrap the high pressure hose around several times after you've finished using the washer. Without removing that, I cannot remove the main pump out of the black casing like you did.

🙈 nearly laughed