The Karcher site does have very good documentation for their washers,
including exploded diagrams that make it pretty easy to locate the
parts. I think the part I had to replace was a seal.
David,
I have been looking around the Karcher web sites but all the
documentation I can find is the user manual. Exploded diagrams will be
very helpful for me but I can not locate where they are. Could you
point me to the right place?

Thanks you very much for your hint
Sammy