This document pertains to the KATO HD2310III, a hydraulic excavator engine model. KATO is recognized for its robust engineering and reliable equipment, designed to meet the demanding requirements of various industrial and construction applications. The HD2310III generation represents a continuation of this commitment to quality, offering efficient performance and durability for heavy-duty operations. This comprehensive Workshop Service Manual in English provides essential information for the maintenance and repair of the KATO HD2310III. It covers a wide range of topics including detailed repair procedures, diagnostics, adjustments, disassembly and assembly instructions, and pictorial and exploded diagrams. The manual also includes crucial service data, special tool references, tightening torques, wear limits, troubleshooting guides, and important safety precautions to ensure the safe and effective operation and upkeep of the equipment.