The Hitachi EX270LC-5 Excavator is a robust piece of equipment designed for demanding operational tasks. Featuring ISUZU A-6BG1TQA, A-6BG1 TQA01, and HINO H07D engine options, this model exemplifies engineering quality and reliability. Its construction and design are intended to provide efficient performance and durability in various work environments, making it a dependable choice for construction and heavy-duty applications. This comprehensive service repair manual provides detailed guidance for maintaining and repairing the Hitachi EX270LC-5 Excavator. It covers essential areas including operational principles, troubleshooting, system overviews, component operations, and performance testing. The manual also includes in-depth information on hydraulic and electrical circuits, connectors, and harness details, along with workshop procedures for the upperstructure, undercarriage, front attachment, and engine. This resource is designed to equip owners, mechanics, and technicians with the knowledge required for effective diagnosis and repair.