This workshop service repair manual covers the Volvo Penta 280DP and 280PT sterndrive units, part of the 280 Series. These sterndrives are engineered for reliable marine propulsion, featuring either Duoprop (DP) or Single Propeller (PT) configurations. The DP models utilize counter-rotating propellers for enhanced performance and maneuverability, while the PT models offer a single propeller setup. With a mechanical shift mechanism and a standard gear ratio of 1.61:1 for both configurations, these units are designed for robust operation across a range of compatible engines. This comprehensive manual provides essential information for maintaining and repairing your Volvo Penta 280 Series sterndrive. It details critical maintenance procedures, including recommended annual service and intervals for gear oil changes, along with specifications for gear oil type and capacity. Troubleshooting guidance addresses common issues such as gear shifting problems, lubrication, water ingress, and steering system concerns. Furthermore, the manual includes detailed disassembly and reassembly instructions, technical specifications, and vital safety precautions to ensure proper operation and longevity of your sterndrive unit.