The Wacker Neuson 2503, 3003, 3503, and 3703 compact excavators are engineered for robust performance and reliability in demanding work environments. These machines are designed to provide efficient operation and durability, making them a valuable asset for various construction and landscaping applications. Their construction reflects a commitment to quality, ensuring they can withstand rigorous use while delivering consistent results. This workshop service repair manual provides comprehensive guidance for maintaining and repairing these Wacker Neuson compact excavators. It covers essential engine maintenance procedures, including adjustments and checks for the fuel injection system and cooling circuit. The manual also details the hydraulic and electrical systems, offering instructions for components such as the main valve block, travelling drive, instrument panel, and wiring harnesses. Additionally, it addresses optional features like air conditioning and central lubrication systems, equipping owners and technicians with the knowledge to keep these excavators in optimal working condition.