This manual covers the Hyster D138, N40FR, N45FR, and N50FA series forklifts, industrial machines designed for material handling, lifting, and general forklift operations. These internal combustion engine-powered forklifts are engineered for robust performance and reliability in demanding environments, offering lift capacities ranging from 4000 to 5000 lbs. Their construction emphasizes durability and efficiency, making them a dependable choice for various industrial applications. This complete workshop service repair manual, provided in English, offers comprehensive coverage for all repair procedures, from A to Z, across all models, engines, trims, and transmission types. It is designed to assist owners, mechanics, and technicians in maintaining and repairing these Hyster forklifts. The manual includes detailed step-by-step instructions, often accompanied by pictures, to facilitate DIY repairs and ensure proper servicing. It covers every service and repair procedure, enabling users to keep their equipment in optimal working condition.