1. The JOHN DEERE 6125 PowerTech Diesel Engines with Electronic Fuel Systems and Lucas EUIS are high-performance engines designed to deliver reliable power. This online PDF manual, CTM188, provides comprehensive information and instructions for maintaining and servicing these engines. With detailed diagrams and step-by-step procedures, this manual is a valuable resource for anyone working with these engines. Whether you are a professional mechanic or an enthusiast, the JOHN DEERE 6125 PowerTech Diesel Engines manual will help you optimize the performance and longevity of your engine.