This manual covers the Honda TRX400 Rancher, a rugged and reliable utility All-Terrain Vehicle (ATV) produced for the 2004, 2005, 2006, and 2007 model years. Renowned for its durable design and versatile performance, the TRX400 Rancher is engineered for both demanding work applications and recreational use. Building on a long-standing ATV legacy, this model offers a robust 397cc, air-cooled engine, available in both 2WD and 4WD configurations, and typically features an automatic transmission with electric shift for ease of operation. Its solid construction, capable of handling various terrains, and strong low-end torque make it a dependable choice for tasks such as towing and climbing. This comprehensive 500-page Service Repair Workshop Manual provides in-depth guidance for maintaining and repairing your Honda TRX400 Rancher. It details procedures for all major systems, including the engine, transmission, chassis, brakes, and electrical system, covering everything from routine maintenance like oil changes and filter replacements to complete overhauls and component rebuilds. With step-by-step instructions, detailed illustrations, and hundreds of photos, this manual is designed to empower both do-it-yourself enthusiasts and experienced mechanics. It includes troubleshooting charts and diagnostic information to help identify and resolve issues efficiently, ensuring your ATV remains in optimal working condition.