Case 621G - Page 232

7-MAINTENANCE
SelectiveCatalyticReduction(SCR)maincomponents
SupplyModule(SM)
TheSupplyModule(SM)(1)containsapumpwhichwith-
drawstheDEF/ADBLUE®uidfromtheDEF/ADBLUE®
tank(2).TheDEF/ADBLUE®uidisthendirectedtothe
dosingmoduleconnectedtotheDieselOxidationCatalyst
(DOC).
LEIL14WHL0009AB2
DieselOxidationCatalyst(DOC)
TheDieselOxidationCatalyst(DOC)(1)convertspartof
theNOtoNO
2
.TheDOCisrequiredtoachieveasclose
aspossible50%/50%NO
2
/NO
x
ratiobeforetheSCR.The
presenceofNO
2
increasestheNO
x
conversionefciency
oftheSCRcatalyst.TheDEF/ADBLUE®uidisinjectedin
theDOCbythedosingmodule(2)connectedtotheDOC.
LEIL14WHL0010AB3
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