Hitachi Seiki 4NE-600 Parts Manual
Hitachi Seiki 4NE-600 Turning Centre: Parts Manual as Sectional Drawings.
Hitachi Seiki 4NF-600 Manual (Fanuc 6T-B)
Hitachi Seiki 4NF-600 Turning Centre: Operator's Instruction Manual (with Fanuc System 6T-B).
Background
While there are many machines badged "600", this is usually because they were produced or marketed by the 600 Group or one of its subsidiaries.