OPERATOR'S STATION Aftertreatment Device The machine is equipped with the aftertreatment system combining Diesel Oxidation Catalyst (DOC) block (1) with Selective Catalytic Reduction (SCR) block (2) to remove nitrogen oxide (NOx) from the exhaust gas in order to meet governmental emissions regulations. 2 The DOC reduces harmful substances in exhaust gas by chemical reaction, then DEF is injected in dosing module (injection chamber) (3) and mixed into the exhaust stream. DEF decomposed to ammonia and CO 2 . SCR catalyst converts NOx into harmless nitrogen gas and water vapor by accelerating chemical reaction with the ammonia.
The remaining ammonia is decomposed into nitrogen and water by DOC in SCR block (2). Follow the instructions below to prevent the aftertreatment device from being damaged. 1 3 95Z7B-SCR4 IMPORTANT: Refer to 1-35 for further information. Exhaust gas from the aftertreatment device, and exhaust piping becomes hotter during and right after engine running and regeneration of aftertreatment device. Be careful not to let your skin contact any part of exhaust system or hot gas from the exhaust piping. It may cause severe burns. If flammable objects such as dried leaves or paper scraps are around the aftertreatment device, they may cause a fire.
Before maintaining the machine, stop the engine and make sure the engine has cooled down sufficiently to prevent burns. Be sure to use fuel that complies with JIS K-2204, EN-590 and ASTM D-975 which contains 15 ppm or lower sulfur. If the fuel described above is not used, exhaust gas that exceeds the regulation values may be discharged and serious problems may arise on the engine. 1-3