This manual covers the Clark OH-339 C500 forklift, a robust piece of industrial equipment designed for efficient material handling. Engineered for reliability and performance, the OH-339 C500 is built to withstand demanding operational environments. Its design emphasizes durability and operational longevity, making it a trusted choice for various warehousing and logistics applications. This Factory Service/Repair/Workshop Manual provides comprehensive guidance for the maintenance and repair of your Clark OH-339 C500 forklift. It details procedures for engine overhaul (gas, diesel, and Perkins diesel), fuel systems including Bendix-Zenith carburetors and LPG systems, ignition, and electrical systems. Coverage extends to transmission overhaul (HydraTruk and manual), drivetrain, braking system, steering, and the complete hydraulic system, including pumps, valves, cylinders, and accumulators. Additionally, it addresses upright maintenance, engine testing, and exhaust emission systems, ensuring all aspects of the vehicle can be properly serviced.