The Komatsu PC228US-3 is a robust excavator designed for demanding construction and earthmoving applications. Built with Komatsu's renowned engineering, this model offers exceptional reliability and performance, featuring a powerful Komatsu SAA6D102E-2 diesel engine with a net power of 110 kW (148 HP) and a displacement of 6.67 L, compliant with Tier 3 / EU Stage IIIA emissions standards. Its hydrostatic, electronically controlled transmission ensures efficient power delivery, with travel speeds ranging from 2.8 km/h in low gear to 5.5 km/h in high gear. With an operating weight of 23150 kg and a compact transport width of 2990 mm, the PC228US-3 is engineered for productivity and maneuverability on diverse job sites. This Workshop Service Repair Manual provides comprehensive guidance for the Komatsu PC228US-3, serial numbers 20001 and up. It covers all essential aspects of maintenance, repair, and technical understanding, including detailed procedures for engine and hydraulic systems, lubrication requirements, and specifications for various components such as the boom, arm, and bucket. The manual's thorough documentation is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance, longevity, and safety of their equipment through accurate servicing and troubleshooting.