In a well assembled construction that is correctly lubricated, maintenance is restricted to ensuring that the whole assembly and lubrication methods remain satisfactory.
• The installation geometry, and particularly the sprocket alignment and tooth wear,
• The state of the chain, particularly to detect traces of rub- bing indicating a geometrical failure or accidental structural contact and to assess the amount of wear:
→ wear of the chain articulations is measured directly by its length (using a measuring instrument or a control ruler), either by appreciation or measurement of its slack or moving the tensioning device,
→ wear of the linkplates of leaf chains,
→ wear of the rollers and wheels.
• If necessary, find out the cause of wear and rectify it. If it is necessary to change a sprocket or a chain due to exces- sive wear (more than 2% for the length of a chain, or more than 5% for the height of the plate), then it is better to change both the chain and sprocket or rollers at the same time.