thanks nthach,

The seals at the output for the pitman arm is leaking allright, but so is an inner (teflon ?) seal.
I also learned that you need special tools to disassemple the steering box.
So far so good, BUT without further documentation, I think I will have my favourite repair shop do the rest.

Still missing info/documentation on the steering box itself.
Anyone out there who can point me in a helpful direction ?