Mack CSM 2010, Operator'S Handbook Manual

Page: 179 / 232

Mack, Emissions Solution 171
The Mack SCR system is simple and effective, with few components. It consists of a
Aftertreatment DEF tank positioned near the standard diesel tank, plus a Aftertreatment DEF
pump, Aftertreatment DEF Dosing unit and SCR catalyst.
The advantage of using DEF is that it enables the engine to use less EGR -- and higher
oxygen levels -- for better combustion, while meeting the EPA near-zero NOx emissions
requirement of NOx. By using DEF, we avoid the disadvantages of increasing EGR to
massive levels. This results in better fuel economy from your Mack engine.
W2055493
Horizontal SCR,
CAUTION
Do not put diesel fuel in the Aftertreatment
DEF tank. Diesel fuel, if sprayed into the
hot exhaust along with the DEF, could
ignite explosively causing a fire resulting
in personal injury or damage to the exhaust
system.