This workshop repair manual provides comprehensive guidance for the manual transmission gearboxes fitted to vehicles. Specifically, it covers the JH1, JH3, and JR5 gearbox codes, which are integral components in models such as the Twingo, Clio, and Laguna II. has a history of engineering reliable vehicles, and this manual focuses on maintaining that quality through detailed technical information. It delves into the intricacies of these manual gearboxes, including their internal lubrication systems, gear trains, and clutch interfaces, offering in-depth knowledge for effective servicing and repair.

The purpose of this manual is to serve as an authoritative resource for owners, mechanics, and technicians. It details essential maintenance procedures, such as fluid level checks and changes, alongside advanced repair and rebuild instructions. The manual covers disassembly, assembly, inspection, and troubleshooting for common issues like bearing wear, synchronizer damage, and gear selection problems. Technical specifications, including torque settings, clearances, and tolerances, are provided to ensure precision. Furthermore, it includes guidance on specialized tools and diagnostic procedures, enabling users to efficiently maintain and restore the optimal performance of these manual gearboxes.