This service repair manual covers CLARK GPX 30, GPX 35, GPX 40, GPX 40S, GPX 50, GPX 55, DPX 30, DPX 35, DPX 40, DPX 40S, DPX 50, and DPX 55 Forklift models. These forklifts are engineered for demanding industrial applications, offering robust performance and reliability. This manual details the comprehensive maintenance, assembly, disassembly, servicing, repair, and troubleshooting procedures essential for keeping these machines operational. This English-language manual provides extensive technical information across 602 pages, including detailed specifications, diagrams, photo illustrations, and schemes. It guides users through planned maintenance, lubrication, and the servicing of critical systems such as the engine (Diesel, Gas/LPG), electrical system, drive axle, braking system, steering system, hydraulic system, and uprights. With step-by-step operations and troubleshooting guides for common issues, this manual is an indispensable resource for owners, mechanics, and technicians.