Old Britts – Assembling the Commando Gearbox
Download the complete PDF version using the green download button at the top right of this page for detailed Norton Commando gearbox assembly and rebuilding procedures.
This comprehensive technical article by Fred Eaton walks Norton Commando owners and restorers through the complete assembly process for the Commando gearbox using detailed workshop photographs, exploded component references and practical assembly guidance. The guide covers gearbox bearing installation, camplate and quadrant positioning, layshaft setup, selector fork installation, gear cluster assembly, shim adjustment, kickstart assembly and final outer cover fitting procedures.
Detailed explanations are included covering common gearbox assembly mistakes, correct gear positioning, end float measurement procedures and proper ratchet spring setup to ensure smooth gear selection and reliable gearbox operation. The article also includes workshop tips for clutch operating lever alignment, gearbox gasket sealing, lockring tightening tools and safe assembly techniques used during Norton gearbox rebuilding projects.
Contents Include
- Gearbox bearing installation procedures
- Camplate and quadrant positioning
- Gear cluster assembly guidance
- Mainshaft and layshaft setup
- Selector fork installation procedures
- Layshaft end float measurement
- Shim selection and adjustment
- Kickstart shaft and spring installation
- Ratchet spring adjustment guidance
- Clutch operating lever alignment
- Outer cover installation procedures
- Gearbox gasket sealing recommendations
- Workshop assembly photographs
- Common gearbox assembly troubleshooting
Covered Norton Models
- Norton Commando 750
- Norton Commando 850
- Norton Roadster
- Norton Interstate
- Norton Fastback
- Norton Hi-Rider
- Norton MK3
