This Service Repair Manual covers a range of Hyster forklifts, including the S3.50XM (S70XM), S4.00XM (S80XM), S4.50XM (S100XM), S5.50XM (S120XM), S5.50XMS (S120XMS), S4.00XM BCS (S80XM BCS), S4.50XM BCS (S100XM BCS), and S5.50XMSPRS (S120XMSPRS) models, designated by the series code [E004]. These robust machines are engineered for material handling applications and feature various engine options, including the GM V6-4.3L with fuel injection and the Perkins 1000 Series Diesel. Their design emphasizes reliability and performance, with lift capacities ranging from 7,000 to 12,000 lbs. The manual is presented as a high-quality, complete resource, reflecting Hyster's established reputation in the material handling industry. This comprehensive English-language manual provides in-depth information for owners, technicians, and maintenance personnel. It covers all essential aspects of vehicle care, including detailed periodic maintenance schedules, fluid capacities and specifications, and component repair procedures. The manual offers step-by-step instructions for assembly, disassembly, and the repair of key systems such as the powertrain, chassis, hydraulic system, and electrical components. Furthermore, it includes extensive troubleshooting guides, diagnostic procedures for electronic engine controls, and technical specifications supported by diagrams, schematics, and actual photo illustrations, enabling efficient and cost-effective maintenance and repair.