In operating bush chains an option is to employ plain rimed traction wheels in place of sprockets. These can be more forgiving than sprockets since in operation it is diameter that is lost and the negative impact of worn sprocket teeth can be avoided. Successful operation however is dependent on adequate tractive force between chain and drive wheel.
Where the weight of chain, buckets and material is inadequate the bearing pressures may not be enough to create positive traction, in addition where the elevator operational parameters are unable to keep the elevator boot clear, build up of material and dredging can have the same effect. Inadequate tension can also prevent correct traction and slippage at start up is often the cause of accelerated bush wear/flatting.