This workshop service repair manual covers the KATO HD1023 III and HD1023 III-LC Hydraulic Excavators, serial numbers 9478101 and above. These machines are engineered for robust performance and reliability in demanding work environments. Powered by a Mitsubishi 6D34-TLE2A turbocharged diesel engine, these excavators feature a 6-cylinder, in-line, 4-cycle configuration with a displacement of 5.86L, delivering efficient power for a wide range of construction and excavation tasks. This comprehensive manual provides detailed information essential for the maintenance, repair, and troubleshooting of your KATO hydraulic excavator. It includes in-depth coverage of all major systems, such as the hydraulic, engine, and electrical systems, along with specific procedures for components like front attachments, swing equipment, and travel equipment. With detailed instructions on lubrication, tightening torques, consumable parts, and electrical maintenance, this manual is an indispensable resource for owners, technicians, and mechanics seeking to ensure optimal performance and longevity of their equipment.