ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS
EMISSION
This engine complies with the EU Stage IV emission regulation in the European Union.
About Diesel Exhaust Fluid (DEF)
Diesel Exhaust Fluid is the aqueous urea solution for the SCR system.
The
Komatsu Urea SCR system: A device which decomposes the toxic nitrogen oxides (NOx) mixed in the ex-
haust gas into harmless nitrogen and water. Spraying the reagent (Diesel Exhaust Fluid) into the exhaust gas
produces a reaction between the nitrogen oxides and ammonia generated from the urea solution and decom-
poses the nitrogen oxides into nitrogen and water.
DEF is the abbreviation for Diesel Exhaust Fluid, and is represented as DEF throughout this manual.
DEF is a colorless clear and aqueous urea solution made with 32.5 % urea (AUS32) and 67.5 % deionized wa-
ter.
Commercial DEF, commonly referred to as AdBlue
®
in the European Union, that quality standards are main-
tained in accordance with DIN70070 and ISO 22241-1, to be used.
AdBlue
®
is a registered trade-mark of VDA (Verband der Automobilindustrie e.V.: Automobile Association of
Germany).
FOREWORD ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION
1-9
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