steering pump burst

[Konstantin Bogach]

Hi guys.

It burst when I was driving to work. I was lucky that it happened 1/2 mi
from parkin lot.  Pentosin squirts from under X-screw (the one which is
right under one of the high pressure hose fitting, if it make any
difference).
I've heard an opinion that it usually happens when internal seals go bad
(not the one which seals the screw itself). It is true?  How big a
chance that replacing a seal under the screw will cure the problem?
Does anybody buy ZF kit recently? Could you point me to a source?

Thank you.
Konstantin Bogach.
200q '89
200qa '89 (with dead SP)