This document pertains to the Clark GPX series forklifts, specifically models GPX 35, GPX 40, and GPX 50E, identified by the model code GPX715. These industrial machines are engineered for robust performance and reliability in demanding material handling environments. The GPX series embodies Clark's commitment to quality, offering durable construction and efficient operation designed to meet the rigorous needs of various commercial and industrial applications. This factory service and repair manual, designated SM-606, provides comprehensive information for the maintenance, service, diagnosis, and repair of the Clark GPX forklifts. It includes detailed, step-by-step instructions, supported by exploded diagrams and illustrations, covering all major systems such as the engine, transmission, electrical system, drive axle, braking, steering, and hydraulic systems. This manual is an essential resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.