This workshop service repair manual covers the JCB DieselMax Tier 3 SE engine. Engineered for robust performance and reliability, the DieselMax series is a proven diesel engine designed for various heavy-duty applications. This particular model adheres to Tier 3 emission standards, indicating a focus on environmental compliance without compromising power. Its common rail direct injection fuel system and liquid-cooled design contribute to efficient operation and longevity, making it a dependable choice for demanding industrial and agricultural equipment. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of the JCB DieselMax Tier 3 SE engine. It details critical procedures for servicing, including recommended oil grades and capacities, along with intervals for filter replacements. Technical specifications, such as engine displacement, power, and torque ranges, are included to aid in diagnostics and parts identification. The scope of this guide is intended to assist owners, technicians, and mechanics in ensuring the optimal performance and extended service life of their JCB DieselMax engines.