Improved axle bearings and wheelset maintenance so rolling stock is more reliable
The industry raised concerns regarding the storage of bearings and manufacturers’ instructions for storing the bearings in various situations. Handling of wheelsets was also a concern.
Axle bearing components can be reused if they are in an acceptable condition. However, the inspection and judgement of used bearings can be difficult. Standards that categorise defects and set limits could be improved with better images. Images that show the limit of what is acceptable could be particularly useful.
The industry approach to handling wheelsets away from vehicles was inconsistent. It also had the potential to lead to damage affecting safe use or needing repair.
RSSB produced a revised version of RIS-2704-RST on wheelsets handling and an updated RIS-2709-RST for roller bearing defects.
The updated wheelset handling standard now includes guidance on storing, handling, and the shelf life of axle bearings after manufacture or overhaul. This is based on manufacturers’ advice and existing industry practice.
The updated version of the bearing defects standard now includes more photographs of acceptable and rejectable bearing defects. These images will assist the overhaulers. Guidance on the life of polymer cages has also been included.
The additional guidance helps avoid using poorly stored bearings or worn components.
It addresses some of the conditions that can lead to degradation or failure in service. These factors could result in the unscheduled removal of a vehicle from service. It also helps to avoid premature scrapping of high-value components.
The additional photographs of bearing defects assist bearing inspectors in making better decisions when assessing for further use. This helps to avoid waste and risk of failure.