Hi
I have got a karcher 620 had from new so a few years old but it's not had a lot of use it stopped working a few years ago so left it in the garage to gather dust. Yesterday I decided to take it apart to see what was wrong with it i didn't realise there would be oil in it so a bit of mess, once apart I cleaned it all and now it's like new but still not pressurising the water, the non return valves a seem to be seating correctly the motor is turning when switch on so I filled it up with oil again and it back together and still the same fault.
It's just not pressurising the water can anybody give some advice.
Thank you

Marcus, March 2012