This service repair manual covers the Clark SM591 GPH/DPH, a robust industrial vehicle designed for demanding operational environments. While specific production years are not detailed, the engineering of this model emphasizes reliability and efficient performance. Its construction is geared towards providing dependable service in material handling applications. This comprehensive manual is presented in English and is designed to assist owners, mechanics, and technicians in maintaining and repairing the Clark SM591 GPH/DPH. It includes detailed information on planned maintenance schedules, technical specifications, and repair procedures for various systems, including the powertrain, chassis, and hydraulics. The manual covers engines, cooling, fuel, transmission, drive axle, prop shaft, wheels and tires, braking, steering, hydraulic components, uprights, and counterweights, ensuring thorough coverage for effective upkeep and troubleshooting.