This document pertains to the Wacker Neuson 1404 Track Excavator. Engineered for demanding applications, this machine combines robust construction with efficient operation. Its tracked drive system provides superior stability and maneuverability across varied terrain, making it an ideal choice for construction, landscaping, and utility work. The excavator is powered by a reliable Yanmar 3TNV76 diesel engine, a 3-cylinder, 4-stroke, water-cooled unit known for its durability and performance. This Workshop Service Manual provides comprehensive guidance for the maintenance and repair of the Wacker Neuson 1404 Track Excavator. It covers essential areas including general maintenance procedures, fluid specifications, engine system diagnostics, cooling and fuel systems, electrical components, and the hydraulic system. Detailed troubleshooting sections, along with wiring and hydraulic diagrams, are included to assist owners, technicians, and mechanics in diagnosing and resolving issues efficiently, ensuring the longevity and optimal performance of the equipment.