This Service Repair Workshop Manual provides comprehensive information for the Volvo Penta Aquamatic sterndrive series, specifically models 280, 285, and 290, designed for industrial applications. These sterndrives, featuring a propeller drive propulsion system, are engineered for robust performance and reliability. The manual covers a range of internal combustion engine types, with variable displacement and power output, ensuring compatibility with the diverse configurations of the Aquamatic series. This manual serves as an essential resource for maintaining and repairing your Volvo Penta Aquamatic sterndrive. It details A-Z service, repair, and maintenance procedures, including step-by-step instructions, helpful pictures, and critical wiring diagrams. Owners, mechanics, and technicians will find detailed guidance on routine maintenance, common troubleshooting scenarios, and technical specifications necessary for optimal operation and longevity of the drive unit.