This workshop service repair manual covers CLARK GCS12, GCS15, GCS17S (G127 SERIES), GCX12, GCX15E (G127 SERIES), GPS12, GPS15, GPS17 (GP127 SERIES), GPX15, and GPX17E (GP127 SERIES) forklifts. These models are equipped with reliable 4-cylinder, 4-cycle internal combustion engines from MITSUBISHI, including the 1.6L 4G32 and 2.0L 4G52 and 4G63 variants, all capable of running on Petrol or LPG. Engineered for demanding industrial environments, CLARK forklifts are known for their robust construction and operational efficiency, making them a trusted choice for material handling needs. This comprehensive manual provides detailed information essential for the maintenance, repair, and troubleshooting of your CLARK forklift. It includes general information, safety precautions, specifications, periodic maintenance schedules, special tools, and lubrication charts. In-depth procedures cover engine systems, fuel systems, transaxle overhaul, clutch and differential, electrical systems, brake systems, steering systems, and hydraulic systems. With high-definition diagrams, bookmarks for easy navigation, and clear instructions, this manual is an invaluable resource for both professional mechanics and users seeking to perform their own maintenance, ensuring the longevity and optimal performance of their equipment.