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FOREWORD
ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION
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 decompo-
ses 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 colourless 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).
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