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Old 15-07-2017, 12:11 AM   #1
Slammedorion
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Nilfisk C120 - Pumping/ Pulsing on standby

I've looked at many C120 pulsing threads... but can't find a definite fix for pulsing on standby
I've checked inlet and outlet seals - all ok
Checked inlet filter ( was clean )
Presume I need to pull the machine apart... although there seems to be no visible leaks
I have read somewhere about a faulty pressure switch could be the culprit
Anyone help?
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Old 15-07-2017, 12:22 AM   #2
OvEr_KiLL
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o rings if you havnt already.?
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Old 15-07-2017, 12:24 AM   #3
justinio
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There will be a small leak somewhere. Just a matter of chasing it down.

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Old 15-07-2017, 12:28 AM   #4
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Quote:
Originally Posted by OvEr_KiLL View Post
o rings if you havnt already.?

Inside the machine?
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Old 15-07-2017, 12:34 AM   #5
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Quote:
Originally Posted by Slammedorion View Post
Inside the machine?
no, theres one of the end of the intlet for the hose pipe connector and also one of the bit that clips in the gun
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Old 15-07-2017, 10:10 AM   #6
neilmcl
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I had the same with mine a couple of months ago, got some o-rings and changed the one on the hose end that connects to the gun as I noticed a few drips at that end. Completely fixed the problem.
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Old 15-07-2017, 10:28 AM   #7
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It's not leaking though?
Works fine when I press the trigger...
Just pulses away on standby?
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Old 15-07-2017, 10:52 AM   #8
neilmcl
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Quote:
Originally Posted by Slammedorion View Post
It's not leaking though?
Works fine when I press the trigger...
Just pulses away on standby?
No that you know of. Mine worked perfectly fine too but did exactly the same as yours and pulsed on standby. It started of once in a while then eventually once every 10 secs or so. Seriously, get a replacement o-ring kit and start eliminating potential areas starting with your hose.
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Old 15-07-2017, 10:54 AM   #9
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Have a look at this thread and contact Steve at North West Pressure Washers. If you have checked for leaks it could well be the Start / Stop valve.

http://www.detailingworld.co.uk/foru...d.php?t=386104

Cheers

Simon

Last edited by simonvespa; 15-07-2017 at 10:54 AM. Reason: Forgot link!
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Old 15-07-2017, 11:18 AM   #10
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Quote:
Originally Posted by neilmcl View Post
No that you know of. Mine worked perfectly fine too but did exactly the same as yours and pulsed on standby. It started of once in a while then eventually once every 10 secs or so. Seriously, get a replacement o-ring kit and start eliminating potential areas starting with your hose.

Mines pulsing every 1-2 seconds...
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