This workshop service repair manual covers the KATO HD1023 III Hydraulic Excavator, including the HD1023 III-LC model variant, for serial numbers 9478101 and above. Engineered for demanding operational environments, this excavator is built upon a foundation of robust construction and reliable performance. Its design prioritizes efficiency and durability, making it a capable machine for a wide range of construction and earthmoving tasks. The integrated MITSUBISHI 6D34-TLE2A turbocharged diesel engine, a 6-cylinder in-line, 4-cycle unit with a displacement of 5.86L, provides the power and torque necessary for challenging job sites. This comprehensive manual is designed to assist owners, technicians, and mechanics in maintaining and repairing the KATO HD1023 III Hydraulic Excavator. It provides detailed information on essential maintenance procedures, including lubrication schedules, tightening torque specifications, and consumable parts. The manual also covers the inspection and replacement of various components within the electrical, hydraulic, and control systems, as well as the engine cooling, air cleaner, and wiper systems. Furthermore, it includes diagrams and procedures for the front attachment, swing equipment, lower structure, and travel equipment, ensuring thorough coverage for optimal vehicle upkeep and operational readiness.