Top man 👍! Had the same problem with little pressure from my K4 just fitted my new cylinder head exactly as you described and now power washing my drive. I have thrown karchers away before with similar problems 😣. Thanks buddy 🙏 saved me a few quid there.

I used this pump to replace the pump on a Ecell 3100 PSI pump. kzfaq.infoUgkxEU8wdEWW31diRsOawsCNfWEho39M27qd The model # is PWZ0163100.02 for those looking for a matching pump. It went on very easily - 10 minutes at most. Feels like a lot more power than the original but that's to be expected. Can't tell a difference when cleaning with the wand or floor sprayer. Would recommend as it was cheaper than most I found. The maintenance free aspect is definitely a plus too. Have used it through about 6 tanks of gas and have zero issues so far.

I have just found two K4 machines in a skip, the first one had a dirty filter which is based at the start of the inlet pipe and now works perfectly, second one is the K4 economy, this one has low pressure and it pulsates, so I will now order a new head for it, thanks so much for doing this video 👍

Thanks: I thought this won't work but in minutes my washer was back to life and you've saved me a few hundred quid!

Many thanks for posting your excellent video. Just ordered genuine Karcher part from eBay for just under £20

Thank you for this video. Lost all pressure in my 15 year old K4. I followed your instructions and replaced the part you recommended. It’s back to normal now! Saved me quite a lot of money there!

Just changed the head on my Karcher K4 full control pressure water due to an internal leak. Your video is spot on and the leak has now been fixed. Total cost just under £20. Many thanks. Regards Ian

Hi Jammy, came across your vid. This helped me to decide to tackle mine. Bang on. Thank you. £20 repair over buying new.

Glad I watched this.I was worried about the grease being emulsified. None of the other videos give that type of info.

Thanks for this video! My K4 lost some pressure, was still operational but would not go above soft power. I have replaced this part and now works as new again!

Thank you very much. I discovered today my 520 m has the very same pulsing problem. Now to order the replacement part. Saved my bacon.

Thanks for your helpful video. I like to try to fix all at home. I have a K4 BASIC bought two years ago that, since new, it had a hard start pulsing, but after several seconds it worked fine. This would happen again if I stopped using it for some minutes. I thought about taking it to the supplier, but due to COVID, I did not do it and now it is out of warranty and now is just pulsing with just a few hours of use. I let it bleed for more than 20 minutes several times and it did not help. Now I'm going to start by opening it and exploring to see what I find. Already have good information to try to get it back without overspending. Thanks a lot and best regards from México.

It's about time they brought out an upgraded part for this design flaw, must be making a mint on parts, on my 3rd head same machine...

Great video. I ordered the part from the link in the description and it came next day. Easy to fit if you follow the video. 👍

Thank you so much!!!! 💓 This helped us fixed the whole thing. It was pulsing so we replaced it with the part you said. Then it kept pulsing at the highest level. So we saw the tip of changing the lans. And that worked too! You made our day!!!

dOOd, the guy at the start of the vid said "lay it flat when running"... just sayin'. Oh, and thanks for the tips. Clear and thorough. Motivated me to fix mine instead of factory refurbish. Nice. Good job.

Good job well done. Av got a K4 & it has started to leak & dropped in pressure a bit so I need to take it apart & investigate. Thanks for video. All the best for 2024. 👍🎄

I'm going through this right now! Mine did exactly what you said and the pump was on today and there was no water pressure at all. I'm here in the states, my Karcher is slightly different than yours, but I'll be looking for the same thing. It's hot as hell here today and my pressure washer died in the middle of me cleaning my house. Thanks mate! I appreciate this.

Jammy the legend , I could do without this job , but you have gave us the knowledge . thanks

Im fairly sure that is not grease inside, that is oxidised motor oil!! You need to remove it and put fresh oil in!

My k4 is pulsing, now I'm going to fix it myself, thanks pal for the informative vid..👍

Great video, my k2 wasn't gaining any pressure and the motor wouldn't turn off and kept on regardless. After replacing the entire head unit I discovered that the metal gear on the motor has separated from the shaft. If you turn it by hand it all spins but under any physical pressure it doesn't spin just the shaft on the motor spins. If you ever have similar issues its worth looking at, Im going to put a bead of weld on the tip over the gear and shaft tip to hold the gear solid onto the shaft

excellent video, all I needed to know to repair my Kacher. really good to see where to get the parts, overall very helpful and made it very easy. Thanks

Excellent video. I have the pulsating water pressure problem described so now I have the confidence to repair it myself. Thanks!

I bought new pressure washer in around April by Dec it's not building pressure I took a look cleaned up thr filter and checked the lance. It's too late at night to see if that'll be enough! I think it's the pump inside. It'll be me doing the work on my own if not. I have a pro kleen in brand. Honestly I've had enough of these types though I saw the drill type cordless ones I think I may have to just buy another. Again. Great video really appreciated.

My K4 was pulsating similarly so suspect it was the valves replacement part - but you also mentioned leaking water which mine has ; so could be the black outward pipe you mentioned. Will have a go ! Good video 👍🏼

I went through your link to get the part I think I need hopefully it works it's turning up today

Tks a LOT - Resolved my issue in now time - glad I found you before deciding to throw it away ;-)

Very very helpful video. I’ve just repaired mine thanks to your video 👍

very nice. just one remark: at the end of your video you use the karcher standing up instead laying down ;)!

Good informative, well presented video, my power washer has that exact problem, now be able to attempt a repair

great video and saved me a lot of money as I already had the tools to do it, thanks again

Laurie Haynes , great talk Jammyone you have explained everything great video many thanks , I will get my old 620M all good again

Great video. Thx for taking the time to share the fix.

just changed my cylinder head on my k4 full control and have full power again now. took me quite a few hours as i snapped the on/off shaft lever TWICE after gluing back together. would have otherwise not been too bad. dont lay your machine face down when reinstalling the back cover. would be a much quicker process if i had to do it again although a PITA.

Great video! best compliments to you! today I am starting to check and fix my Karcher K2.75 it's an old type so I hope to find the spare part!

Before undoing the 4 socket head bolts you should have mentioned to keep the motor+pump combo vertically, now my workbench and myself are covered in a very very low viscosity shiny silver oil, the silver color coming from the aluminium part that has been destroyed by rubbing against the springs on the plungers.

Sorted thanks, I’ll repair my k4 premium today.

I have discovered that there is another possible cause of pulsing with the K3 unit. The housing that contains the low pressure water inlet and the high pressure water outlet can crack, allowing water to leak out OR pass from the high to the low pressure side. This results in pulsing. It requires the replacement of the very expensive manifold (currently about USD$ 82-115 !! The cracks can happen if water freezes in the unit. I just replaced the pump head as you showed, now I'm faced with another expense that begs the question "is it worth fixing?"

Hi Jammyone - thanks for your video - I’ve just put a new water pump on my K3 - this was surging and really was not fit to use - now with the new water pump I still have problems but to a lesser degree - my K3 is circa 2006 - I hope that you can help - all the best to you - Geoff

Thanks for sharing, class work and video

Jammy one your a legend 👍but why didn’t you put your repaired jet washer the right way up when you tested it lol 😂

Great video mate very helpful. Only thing you didn't explain was how and what way the triangle rubber seal sits in on top of the cylinder head.

Nice video. Thanks for sharing your knowledge

thx,m8te. nice video and explanation. yes it is cheaper to repair,than just buy new. more people should do it, it's fun and y learn from that.....:) best regards from vikersund,norway

Fixing surging can be as simple as changing o rings on the lance commectors, also changing the large o ring inside the pump housing. I’ve fixed mine a few times over the years that way but now my power won’t turn off, and the lance is maybe putting out 20% of what it should have so away to look at the cylinder head and electrical module.

Excellent video. Thank you for sharing your knowledge about this quick fix👍

Great fixit vid. Mines pulsing, will be doing this!

thanks for the info.....

The piston spring below which has grease is it advisable to pour some car engine oil for good lubrication.

Excellent. Thanks for the vid. My k4 only hits level 2 medium now so will give this a try. Parts costs $85 in Australia though unfortunately vs 20 gbp.... Grrr

I have K3 which has no pressure at all it’s not leaking water the water is coming out I’ve bought the part in this video but I realise the inside is different to the k4

If pulsing check nozzle on vario lance is not blocked

Türkiyeden Selamlar Elerinize Sağlık👌

Good vid mate. Hopefully it will save people a few quid with this simple fix. 👍

Very useful and easy to follow video. Ive replaced the part as youve demonstrated but cylinder head very difficult to screw back on. One screw inparticular very trickys if its cross threaded.when put back together it still surges and leaks fromcylinder head as though its not fastened down tightly enough. Any ideas why?

fabulous ! thank you.. My jet wash is now like new again! for only £30.... you have a sub here!

Thanks for that.. I had my k4 full control fixed by a local guy after most likely frost damage, leaking and pulsing. It was neven fully right after, didnt have the power to swirl the dirt buster nozzel.. Now its running very little pressure and the pump is not pulsing but is running all the time? Do you think same fix would solve it?

Hi mate great video. I stripped mine down as my K4 water gushing water internally. Could see it leaking on the control head seen in your video. I have replaced that. Good news is I no longer have any visual leaks. The inline filter at the inlet is clear. And pressure seems good. But the motor isn't kicking off when you stop with the trigger. The new control head came assembled but the part came with a white insert collar and flat seal which the kit said I had to fit. Plus I lost the tiny pea ball valve on the soap line that connect to the pump head. Would that cause the pump to not shut off? Or have I reassembled wrong somewhere. I am tech savvy and pretty sure I assembled everything right. Any help help appreciated. Great video...

An excellent tutorial - thanks.

Thank you, very helpful

Great share! Feel disappointed- heating pump lasts 20 years, electric cars drive 150K km and more before engine troubles, so I am kind of spoiled!! But don't see why Kärcher doesn't make a more longer lasting device.

Hello, Great video. Thank you. We have a Karcher K4 Full Control. The water pressure from the hose is fine. I've run water through it without the high pressure hose attached to clear any air locks or debris. When I turn the pressure wash on, it doesn't pulse. With the vario lance attached and set to low pressure it doesn't pulse. If I turn the vario lance to the highest pressure, that's when it starts to pulse. I can turn the vario lance ever so slightly below the highest pressure and it doesn't pulse. I've attached the dirt blaster lance which operates at the highest pressure and the washer still pulses. It certainly looks like a pressure issue. Is it likely to be the cylinder head pump that is faulty? Thank you, Ant

Great video, this is the exact model i have :)

good video. Gave me to confidence to give it a go on my K4. Put the part in and put it all back together but the pulsing is still there. Any ideas what other (if any) things might cause it?

On my second, never buy one again, not reliable but I will try this fix.

Very helpful Thanks mate 👍

Hi Jammy My K4-200 has lost pressure but is not noticeably pulsating. Is this likely to be caused by the cylinder head or the pressure regulator? I will appreciate any advice? Rod

Hi Jammy, my KB9020 made a dull popping sound when in use and lost all pressure. There was a fine spray emitting from the vent (ruptured seal?). Before I start throwing good money after bad, do you imagine replacing cylinder head, as per video, would resolve this. Thank u

I have a K4 full control. Replaced the high pressure outlet and suction connection elbows due to leaking from suspected frost damage. When build back up with new parts, i plugged in the hose to check all was good. Water started leaking from the cylinder head control unit. Would that be a simple enough replacement lke the full head?

Excellent vid thank you

Great video, very helpful. I’ve just ordered one of these to fix my own washer. Could you tell me what tools you used please so that I can make sure I have the right ones? Thanks

Great video, thank-you. I followed the steps and replaced a cracked cylinder head. Now however I have a pulsing issue, but only when the nozzle is turned to hard (strongest mode). If there is no nozzle on or if it is turned to soft, then there is no pulsing. Any idea why this may be happening?

Hi very informative I did give up with mine until I watched your video, I have a Karcher B203 model which I've had for a number of years. In all that time I had it I got to use it once, and that was to clean a driveway of someone I knew. I then let that person have use of it when they wanted to which was fairly regular. Everything was fine until I needed to use it to give my car a thorough clean doing underneath as well, and got it all set up ready to use. Guess what it didn't work nothing at all happened no sound no nothing. So I'm thinking that the person that used had run it without the water turned on and messed it up I did tell them but they chose not tell me at the which was wrong. I then stored in my garage in the hope of one day getting it repaired maybe this is the time. Oh I did check the fuse that was OK, do you have any ideas on what may be wrong with it please regards Reg

Is this problem for pulsating of the power washer when turned on and water spurting out from underneath the metal frame connected by 4 silver bolts?

Thanks

This doesn’t seem to be like my K4 full control… my washer kept running with wand (small hand gun part), or if I release the trigger it keeps running but not water coming out. It wasn’t pulsing just kept running… do they have uploader Switch/valve something? Mine is now about 200 quid. Bought in 2018 I think, latest 2019. That make sense to you? Thanks for your vids, they’re great, just not this time I reckon.

Hello, just found the receipt, date of purchase 24/03/21 from B & Q not that it's their problem one bit.

Hiya, I have a k4 power control. I'm not struggling with it pulsing, it just wint reach maximum pressure, it reaches medium, rather than high. I've checked the nozzle end and it's clear, do you have any idea what next to look at? High pressure hose? This cylinder head? Any help is greatly appreciated, TIA

Very helpful

Great vid

Firstly Thanks for the Video very helpful ok here goes my problem is at first my K4 was leaking and pulsing so followed your video and great fixed the pulsing and leaking problem then I wouldn’t start then found out I needed to bleed the system so done that switch on and hey it works with no lance attached now when I attach the lance it won’t work so I let water run through again yep it works with no lance attached switch on switch off all working fine tried with lance not working so I tried it a different way left it for a while switched off bleeding the air out then switched water off attached the lance pressed trigger then turned water on water now coming through lance then switched power on hey it worked pressure washer working again until you let go of the trigger and press again now doesn’t work again tried this numerous amount of times but to no joy Any ideas what it could be Many thanks Colin

it can also be a faulty vario lance which has happened twice to me, also the mains water inlet has a filter on it which can clog

Yeaaah I’ll probably just buy a new one

Thanks. What tools do i need to change the part?

I borrowed a friend's karcher 2.94 and after a bit it stopped and now only hums for a few minutes and then stops and the trigger does not do anything. I've changed the capacitor as that was a potential fix but no luck. Any ideas?

Great thank you

Thank you so much for your excellent video. I have carried out the replacement following your instructions step by step and it went smoothly. The pressure hs returned but the motor still ' searches ' every 10 or 15 seconds ? Any ideas please.

Hey thanks for this video really helpful. I have a K3 which I’m trying to sort just now. Ordered what I thought was right part but it’s too big. Can you point me in the direction of somewhere to buy replacement part for K3 washer? Thanks

Hi I have the K4 which seems to have this problem, i have removed the part but it looks different to the part listed can you advise please? Mine says PA66 GF50 QC6 thank you

Great video! I have a K5.79. It has not been used for a few years indeed. I tried it and it worked fine for about 3 minutes, then suddenly capacity fell down substantially, and there was a rubber smell. Do you think that is the same cause of the cilinder head? Thank you

Great video well done, but after building back up my leaking is fixed and machine is starting up but without pressure, is there anyway it could have an air lock in system as I have been told to run water through the switched of machine for about 5 -10 minutes then it should start with pressure??? unsure.

Many thanks for the hugely helpful video. Unfortunately, my machine was exposed to frost and since then I have the pulsing problem exactly as you describe. Do you think following your instruction should fix it? Or could it be pulsing for a different reason caused by the frost? Also, do you know is the part in your description compatible with a regular K4 (ie not compact version) Thanks again

hope you can help after stripping the k4 karcher down I find there is just a crack on the black pipe that fits into the cylinder head, I think thats why it doedn,t pulsate just leaks, can I remove the pipe without unscrewing the cylinder head, instructions would help plz, great video cheers

good detailed video, my washer has water gushing out of the motor compartmet but I can't locate where it is from? I know you might think if you don't know, how do I know where it's coming from? but just want your opinion where the problem may be? thank you in advance

Good tutorial mate, i have a question do this particular kind of karcher require maitenance?

Excellent but what was wrong with the old plastic cylinder head?

Perfect video, thanks mate . Have you had much to do with k5 140m please, it’s got low pressure and the on and off switch is not working.

I have no pressure at all I'll give it ago with what you did and hopefully it works thank you

Interesting video. Did you say in the beginning you are supposed to lay it flat when operating it. Then when proceeding to test it you used it upright ? Is it meant to be flat or upright ?