This service repair manual covers the Clark ESM 12/25 forklift, designed for maintaining, assembly, disassembly, and servicing operations. The ESM-II series, specifically models 12 through 25, represents robust engineering focused on reliability and efficient operation within industrial environments. This manual provides comprehensive information to ensure these forklifts perform optimally throughout their service life. This English-language service repair manual, spanning 445 pages, details essential maintenance procedures including Planned Maintenance, Safe Maintenance, and Periodic Service. It covers all major systems such as the battery, electrical components, drive and steering axles, brake system, and hydraulic systems, along with uprights and general specifications. With diagrams, actual photo illustrations, schemes, and detailed specifications, this manual is an indispensable resource for owners, mechanics, and technicians to effectively maintain and repair their Clark ESM forklifts.