Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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If the SCR system does not work when the engine is working normally, please check whether theconnectors
ofDEF pump, spray nozzle and sensor areinstalled reliably. Check whether the DEF connecting pipes and joints
are bent, loose or broken.
Check the fluid level in the urea tank and add timely. If the DEF is poor in quality containing excessive impurities,
please check the cleanliness of the urea tank and clean the tank if necessary. Check the contamination state of the
DEF pump filter element and clean or replace the filter element if necessary. Check the contamination state near
the spray nozzle holes. If the nozzle hole is blocked, clean or replace the spray nozzle.
If the engine is working in cold weather conditions, it is normal that the DEF cannot be sprayed normally because
the DEF has not yet been unfrozen. If it cannot be unfrozen for a long time, there may be a malfunction in the
heating function and you should contact the local service station for troubleshooting.
◆ Exhaust backpressure of engine increased
In the event of serious black smoke or increased fuel consumption during running of the engine,please check for
urea crystals or stones in the exhaust pipe. If theenvironment temperature istoo low or the DEF spray nozzle is
poor atomization, it will probably lead to obviousurea crystallization on the inner wall of pipe. Heatpreservation
measures for the exhaust pipe should be performed as required. Please check the blockage of spray nozzle and
check the catalyst carrier in the SCR tank for damage and timely contact the service station for troubleshooting.
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