This Service and Repair Manual covers Wacker Neuson compact excavators, specifically models 2503, 3003, 3503, and 3703. These machines are engineered for robust performance and reliability in demanding work environments. Featuring diesel engines and hydrostatic transmissions with typically 4WD, they are designed to provide efficient power and precise control for a wide range of construction and excavation tasks. Their compact size allows for maneuverability in tight spaces, making them versatile tools for various professional applications. The purpose of this comprehensive manual is to provide detailed information for the maintenance, repair, and troubleshooting of your Wacker Neuson compact excavator. It includes essential technical specifications, step-by-step procedures for complete disassembly and reassembly, scheduled maintenance guidelines, and diagnostic information. This resource is intended for both professional mechanics and DIY enthusiasts, empowering them to ensure the optimal performance, longevity, and safety of their equipment through accurate and thorough service.