This workshop manual provides comprehensive information for the NEW HOLLAND ISUZU KOBELCO 4HK1 and 6HK1 engines. Designed for owners and technicians alike, this manual serves as an essential resource for understanding, maintaining, and repairing these specific engine models. Its detailed content ensures that users have the necessary knowledge to keep the engine operating at peak performance and longevity. The scope of this manual covers critical aspects of engine service, including detailed maintenance procedures, diagnostic troubleshooting guides, and essential technical specifications. It is structured to assist both novice and experienced users in effectively managing their engine's upkeep. By following the guidelines and procedures outlined within, owners and mechanics can confidently perform routine maintenance and address potential issues, ensuring the reliable operation of the NEW HOLLAND ISUZU KOBELCO 4HK1 and 6HK1 engines.