This factory service manual covers the Clark G127, GP127, G127E, and GP127E series lift trucks. These models represent robust engineering designed for reliable performance in various industrial applications. Their construction emphasizes durability and operational efficiency, making them a trusted choice for material handling needs. This manual is intended to provide comprehensive information for the maintenance and repair of these dependable machines. The purpose of this manual is to offer detailed guidance on the maintenance, service, diagnosis, and repair procedures for the Clark G127 series lift trucks. It includes essential information on engine and transmission systems, cooling and fuel systems, steering and brake systems, hydraulic systems, uprights, wheels and tires, and electrical components. With clear explanations and the inclusion of exploded pictures and diagrams, this manual serves as an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.