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Old 10-01-2018, 02:47 PM   #1
saul
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Pulsating pw

Hi All,

Is it common for a PW to pulsate randomly when powered up but not being used?. Not noticed this before, but today seems it does it after every 10-15 mins or so.

Unit in question is a Nilfisk C120.3

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Old 10-01-2018, 02:51 PM   #2
ENEP
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Mine does it sometimes when the incoming water pressure to PW is to low.
If for an example the water hose is bent and not flowing fully or if i've not opened the water valve fully.
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Old 10-01-2018, 02:55 PM   #3
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It might also do it if there's a slight leak on the high pressure side - the pump will pulse to maintain the pressure.
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Old 10-01-2018, 03:11 PM   #4
LeeH
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As above, my old Karcher has this issue.


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Old 10-01-2018, 03:12 PM   #5
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I have the same machine (C120.3), mine has been doing it for about 12 months, my sons (same machine) did it also before it packed up, not bad though it has lasted about 5 years. Time to seek another one for me.
Do a google search on this problem and many people get this with a Nilfisk, not really any solutions.
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Old 10-01-2018, 09:55 PM   #6
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Quote:
Originally Posted by Vossman View Post
I have the same machine (C120.3), mine has been doing it for about 12 months, my sons (same machine) did it also before it packed up, not bad though it has lasted about 5 years. Time to seek another one for me.
Do a google search on this problem and many people get this with a Nilfisk, not really any solutions.
The reason it's doing this because it's losing pressure, usually because of a leak somewhere. The most common culprit is the O ring on the hose end that connects to the gun. Mine (also a C120.3) did this and it was an easy fix that sorted the issue out completely. If this isn't the problem then as others have said it's probably one of the other O rings so just buy the kit and start replacing them all.

Last edited by neilmcl; 10-01-2018 at 09:58 PM.
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Old 10-01-2018, 03:20 PM   #7
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Normally the pulsating is due to a sticking unloader valve

Simply locate, remove, clean function and grease to return pressure washer to service
Use a smearing of white petroleum grease
A google search on the Karcher model will help you locate
I’ve resurrected my Karcher Hd countless times, all too many Karcher are disposed of for such a simple fix.

I had Another issue and replacing the lance nozzle cured.
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Old 10-01-2018, 05:44 PM   #8
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Quote:
Originally Posted by snrbrtsn View Post
Normally the pulsating is due to a sticking unloader valve
Yes i agree that's usually the problem or its the o ring is damaged, My C120 did after a couple of years I pulled it to bits and found the O ring damaged, nilfisk want £7 for a poxy little o ring its a custom size so even though i have hundreds if o rings i could not find one the right size.
Then my new E140 started doing it so i took it to a nilfisk repair center they diagnosed it as dirty valve so they cleaned it. Been fine since
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Old 10-01-2018, 03:55 PM   #9
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Thank you all. Looks like I may have just missed it in the past. Will keep a listen out for it in the future.
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Old 10-01-2018, 04:14 PM   #10
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My Nilfisk e140 does it alllll the time......i honestly don't think it's a problem to the function and running of the pressure washer as mine has been through hell and it still works fine, had it for around 6 years now also so it's beat any Karcher or bosch I've had.

One thing I have thought about regarding pulsing PW syndrome, even on a brand new machine is mains pressure drop..... A pressure switch will detect any fluctuation in pressure..... Say someone running a tap in your house, or your boiler pulling cold water in etc...
it will take some of the pressure out of the line you have your PW hooked up to, so if that is the case... Nilfisk just have very sensitive pressure sensors setup in their machines.
I've stripped mine and replaced seals, hoses etc.. thinking it was a problem, until I turn it back on, shout 'SUCCESS' then it pulses :/
It's just a handy feature for Nilfisks to let you know you still have it turned on
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