When it comes to post-processing failures, the solution is the urea pump and nozzle of the diesel engine, and the SCR box is also an important component. Its function is to fully mix the urea liquid with the nitrogen oxides in the exhaust gas and chemically react. At present, the heavy-duty SCR box integrates the SCR catalyst and the engine exhaust muffler.

The whole material is stainless steel, which is equipped with SCR catalyst core and muffling pipeline. The lower part of the surface stainless steel plate is filled with thermal insulation material. The average surface temperature during operation is 200-250 °C. The flange face interface is the inlet and the other light pipe interface is the outlet. The catalyst is equipped with a temperature sensor, a nitrogen-oxygen sensor, etc. (the position of the catalyst inlet and outlet temperature sensor is determined during installation).

1. Re-weld or repair the SCR box, add appropriate exhaust pipe bracket to the exhaust line, reduce the transition vibration of the bracket and cause the SCR box to crack.

Disassemble the SCR box to view the crystallization problem, remove the crystal, and use the pure hot water for detailed cleaning until the cleaning is completed, and the recommended assembly of the open welding and the carrier is removed.

2. Check if the oil and air filter are qualified, add qualified oil and replace the air filter.

Check if the air filter is too dirty, replace the air filter, add qualified oil, clean or replace the SCR box.