Optical control display

Chain and belt tensioning systems

The chain has to be replaced if it is not possible to sufficiently adjust the chain tensioner using any of the available adjustment options.


green - grün The chain tensioner is working in the 'green range'. The tensioning force is providing an ideal, smooth running movement.


green - grün The tensioning force is not ideal but is still sufficient.


green - grün The chain tensioner needs to be adjusted. The tensioning force on the chain is too low for a smooth and reliable running movement.

Murtfeldt Spann-Box® systems generally have a coloured scale. This enables you to determine the tensioning state of the chain at a glance. The display is as easy to understand as possible: