This workshop service repair supplement manual covers JCB LK1 Personnel Platform Telescopic Handler models, including those with 3-stage booms such as the 532-120, 535-125, 535-140, 537-135 (550), and 540-140 (550-140), as well as 4-stage boom models like the 540-170 (550-170, 5508). While specific production years are not detailed, this manual is designed to provide comprehensive information for these robust and reliable machines, intended for demanding operational environments. The purpose of this English-language manual is to serve as a definitive guide for the maintenance, repair, and technical understanding of the specified JCB telescopic handlers. It details essential procedures and information across key areas including General Information, Care and Safety, Maintenance schedules and procedures, Attachments, Body Framework, Electrics, Hydraulics, Transmission, Brakes, Steering, and Engine systems. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.