This Service Repair Manual covers the KATO HD1023 III & LC Hydraulic Excavator, a robust machine engineered for demanding construction and industrial applications. Featuring a powerful MITSUBISHI 6D34-TLE2A turbocharged diesel engine with a 5.86L displacement and in-line 6-cylinder configuration, this excavator is built for reliability and performance. Its advanced hydraulic transmission system and durable undercarriage components ensure efficient operation and longevity in challenging environments. The HD1023 III & LC represents a commitment to quality engineering, designed to meet the rigorous needs of professional operators. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of your KATO HD1023 III & LC Hydraulic Excavator. It details lubrication, tightening torques, replacement procedures, and adjustments for various systems, including hydraulics, electrical, cooling, and air intake. Included are detailed diagrams for hydraulic and electrical circuits, along with guidance on cabin systems, battery handling, and component removal and mounting for front attachments and swing equipment. This manual is an indispensable resource for ensuring the optimal performance and extended service life of your equipment.