The JUNG HF 50 RD surface grinder:
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The Jung early f series in original Jung catalog
Replacement parts for the JUNG HF50 1965
Jung F50 spindel rebuild instructions JUNG 1958
The electrical schema of the Jung HF 50 RD
Jung HF 50 Manual (Betriebanleitung)
For those who want to repaint the machine: i used Sikkens Redox Pur Finish, a 2 component super strong Polyurethane paint in the colour reseda green Ral 6011. It has a shiny surface and is really strong. Very happy with it :)