The Kubota Excavator KX91-3S, KX121-3S, U35S, and U35S-3S Workshop Manual is a detailed resource for the maintenance, repair, and troubleshooting of these excavator models. It offers step-by-step instructions for the disassembly, inspection, repair, and reassembly of key systems, including the engine, hydraulics, electrical components, undercarriage, and attachments. The manual includes detailed diagrams, technical specifications, wiring schematics, and diagnostic procedures to help technicians and mechanics ensure accurate repairs and maintenance. This workshop manual is essential for maintaining the optimal performance and reliability of the Kubota KX91-3S, KX121-3S, U35S, and U35S-3S excavators.