SCR systems are installed with a DEF filter to ensure it is free of contaminants.
DEF (Diesel Exhaust Fluid) is a non-toxic solution of 67.5% water and 32.5% automotive grade urea and is one of the key elements of the SCR (Selective Catalytic Reduction) aftertreatment system intended to reduce NOx from the exhaust.
If DEF is not properly filtered, urea crystals and other contaminants gained during transport and storage can cause the SCR system to malfunction or not work properly.
Replace every 1500 hours.
Model Compatibility
Excavators: E145
