LIEBHERR S500 and S800 Gear Hobber: Detailed Operating Manual with tables of gears and differential change gears (includes a copy of the detailed sales catalogue for the similar L301). The manual is listed as for the S500 but contains many pages refering to the S800.

Liebherr S650 Gear Hobber: Parts Manual as Sectional Drawings. Not the best of reproductions - but readable. Printed enlarged to A3.