Hi Folks,

sorry if this is the wrong section for such questions, but it’s a fault I’ve got rather than a recommendation request 🙂

 

My faithful Karcher k3.575 jubilee  pressure washer of 10 years has the ‘pulsing’ issue and is also leaking water...from somewhere I can’t quite work out. 

Watching various videos on YouTube and reading other websites suggested it was probably the cylinder head that needed replacing. I duly bought a replacement and fitted it, but it’s still pulsing and now leaking water from the electrical connection cover (white plastic box)! 
I’m tempted to write this off as ‘uneconomical to repair’ and buy a new washer. It’s a shame, as it’s lasted me so long and not given me any issues until now 🙁.
 

Before I do, does anyone else have suggestions of what it might be? From what I’ve read it could be anything from the sealed pump head to the seals around the motor that keeps it cool with water. 
 

thanks in advance! 

My karcher pulses terribly when water pressure is low (summer weekends!) so the pressure cut-off cycles all the time. I improved it ever so slightly by using brass quick release hose connectors with the bores opened up, and polished and with shortest length of smooth bore heavy gauge hose (yellow horticultural not usual green criss cross domestic).

See if the Karcher is good mid morning and  mid week when no-one is on the bog/showering/washing cars/watering gardens. If not time to upgrade to a hot water petrol model 😁

In  the small print ( often not noticed by users), there's a set up procedure, which if not followed can damage/cause problems . Users are advised ,BEFORE powering up the washer , to flush out the washer with water. It wasn't in the small print for my previous B &Q washer ,and I found that powering up before flushing with water, let the water valve malfunction, meaning that the pump never really got to pressure and I got pulsing. I cured this and then found more pulsing problems caused by poor seals on the washers on the high pressure side of the washer.

Pulsing can be a suction restriction or more likely a blocked nozzle which causes the pressure relief valve to modulate.

 

You get to know the symptoms of both.