This document contains detailed electrical and hydraulic schematic diagrams for the Bomag BW 145 DH-40 and BW 145 DH-4 single drum vibratory roller. It covers system layouts, wiring connections, hydraulic circuits, and component relationships used in these machines. The content supports understanding of electrical and hydraulic configurations for models within serial range 901581601003 to 901581609999. Ideal for technical reference, troubleshooting, and system analysis of BW 145 DH-40 and BW 145 DH-4 vibratory rollers.