The Yale GDP MG (B813) forklift truck, a product of Yale Materials Handling Corporation's extensive manufacturing heritage, represents a robust piece of industrial equipment. This model, built with a focus on reliability and operational efficiency, is designed for demanding material handling tasks. It incorporates GM engines, known for their durability, and features a steering axle for precise maneuverability. The engineering quality inherent in Yale products ensures that the GDP MG (B813) is a dependable asset in various operational environments. This comprehensive service repair manual provides detailed guidance for the maintenance, assembly, disassembly, servicing, repair, diagnosing, and troubleshooting of the Yale GDP MG (B813) forklift truck. It covers essential systems including GM engines, the steering axle, and implied coverage for braking, hydraulic, electrical, and chassis systems. With step-by-step procedures, real photo illustrations, diagrams, and schematics, this manual is an indispensable resource for forklift owners, maintenance technicians, and repair enthusiasts seeking to maintain the optimal performance and longevity of their equipment while enabling cost-effective self-repair.