This Service Repair Manual covers the Clark SM638 CMP series, including models 15, 18, 20, 25, and 30. Engineered for reliability and performance, these vehicles are designed to meet the demanding needs of various industrial applications. Their robust construction and advanced engineering ensure consistent operation and durability in challenging environments, making them a trusted choice for material handling operations. This manual provides comprehensive guidance for maintaining and repairing your Clark SM638 CMP. It details scheduled and planned maintenance, including inspection forms, and covers all major systems such as the engine, cooling, fuel, transmission, ignition, electrical, wheels and tires, brakes, steering, and hydraulic systems. With detailed troubleshooting procedures, repair instructions, overhaul guides, and technical specifications, this English-language resource is essential for owners, mechanics, and technicians seeking to ensure optimal vehicle performance and longevity.