This comprehensive service repair manual covers Hyster forklifts, specifically the S25XM, S30XM, S35XM, and S40XMS models from the D010 series. These robust machines are engineered for demanding industrial environments, featuring reliable GM and Perkins engines, efficient LPG fuel systems with Rochester carburetors, and durable transmission options including Oil Clutch and Single-Speed PS. Hyster forklifts are renowned for their operational efficiency and long-term dependability, making them a trusted choice for material handling operations. This manual provides essential information for maintaining and repairing your Hyster forklift. It details routine and preventive maintenance procedures, along with in-depth coverage of critical systems such as the frame, cooling system, drive and steering axles, brake system, and the complete hydraulic system, including pumps and cylinders. Troubleshooting guides for the electrical system, ignition, and instrumentation are also included, ensuring that owners and technicians have the resources needed to keep these forklifts operating at peak performance.