This manual covers the HITACHI FIAT KOBELCO EXCAVATOR ENGINE EX165W, EX165, EX135, 165 W, and EX135W models. These excavators are engineered for demanding work environments, offering robust performance and reliability. Their design prioritizes efficiency and durability, making them suitable for a wide range of construction and industrial applications. This comprehensive guide ensures that operators and technicians have access to the detailed information needed to maximize the potential of these powerful machines. The purpose of this workshop service repair manual is to provide complete and accurate information for the maintenance, troubleshooting, and repair of the specified HITACHI FIAT KOBELCO excavator models. It includes detailed sections on general maintenance, engine service, transmission repair, brake systems, electrical systems, wiring diagrams, suspension, cooling systems, fuel systems, and more. This manual serves as an essential resource for owners, mechanics, and technicians, enabling them to perform necessary upkeep and repairs effectively, ensuring the longevity and optimal performance of the equipment.