TOS BU28 Cylindrical Grinder Manual TOS BU28 Cylindrical Grinder: Operator's Instruction and detailed Maintenance Manual with Hydraulic and Electrical Schematics. Includes a number of useful Sectional Drawings - but not a complete Parts Manual. Manufacturers: TOS Models: BU28 BU-28 Contents: Operators Manual Maintenance Manual Electrical Diagrams Technical Drawings