Broken roller grate bars
head burned open by primary air
Casting quality: Shrink holes and surface quality
Cornece formations: ash and slag building up at the brick wall
Cracks
Fischgraete – air slits in the wrong area of the grate bar
Foreign obstacles and stones
Fuel
Lifting grate bars
Non-ferrous steel
Nozzles in the head
Nozzles on surface
Overheating of head
Overlapping grate bars
Sulfur
Transportation
Washed out areas on surface
