The **John Deere PowerTech 10.5 L and 12.5 L Diesel Engine Service Manual** is a detailed technical resource designed for the repair, maintenance, and servicing of these specific diesel engine models. It covers key areas such as engine diagnostics, fuel system calibration, cooling and lubrication systems, turbocharging, and electrical components. This manual provides step-by-step repair instructions, troubleshooting tips, technical diagrams, and specifications to assist technicians and mechanics in performing accurate repairs and maintenance. It’s essential for ensuring the optimal performance and longevity of John Deere’s 10.5 L and 12.5 L PowerTech diesel engines.