This workshop service repair manual provides comprehensive information for the Clark SF20-30D/L/G and CMP20-30D/L/G series counterbalance forklifts. These robust machines, designed for material handling applications, offer lift capacities ranging from 2000 to 3000 kg and are available with Diesel, LPG, or Gasoline power sources. While specific production years are not detailed, the engineering quality and reliability inherent in the SF/CMP product line ensure consistent performance in demanding environments. This manual, designated SM688 and presented in English, serves as an essential resource for owners, technicians, and mechanics. It covers critical aspects of vehicle maintenance and repair, including detailed procedures for scheduled servicing, fluid capacities for engine and hydraulic systems, and troubleshooting guidance. Furthermore, it provides technical specifications, power steering and brake system details, hydraulic system information, mast maintenance, and electrical circuit diagrams, enabling efficient upkeep and repair of these Clark forklifts.