Komatsu WA270-8, Operation & Maintenance Manual

ENGINE  TECHNOLOGY  TO  CONFORM  EXHAUST  GAS
EMISSION

About Engine Technology

This  engine  technology  combines  a  Komatsu  Diesel  Particulate  Filter  (KDPF)  and  Komatsu’s  Urea  Selective
Catalytic Reduction (SCR) to conform EPA Tier4 Final emission regulation in North America.

• Komatsu  Diesel  Particulate  Filter  (KDPF):  A  device  which  captures  diesel  particular  matter  or  soot  in  the

exhaust gas to purify exhaust gas. If soot is accumulated to a certain level in the filter, a purification process
to burn the soot is performed automatically to keep the filtering performance of KDPF high.

• Komatsu’s  Urea  SCR  system:  A  device  which  decomposes  the  toxic  nitrogen  oxides  (NOx)  mixed  in  the

exhaust 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
decomposes the nitrogen oxides into nitrogen and water.

About Diesel Exhaust Fluid (DEF)

Diesel Exhaust Fluid is the aqueous urea solution for the SCR system.
DEF is the abbreviation for Diesel Exhaust Fluid, and is represented as DEF throughout this manual.
DEF is a colorless transparent and aqueous urea solution made with 32.5 % urea (AUS32) and 67.5 % deion-
ized  water.  Urea  as  main  constituent  is  a  material  which  is  used  for  cosmetics,  medical  and  pharmaceutical
products, and fertilizer, etc.
Commercial DEF, that is API (American Petroleum Institute) certified and fulfills the quality requirements in ac-
cordance with ISO 22241-1, is to be used. The certified DEF has the API DIESEL EXHAUST FLUID Certifica-
tion Mark shown as follows. Look for the API DEF Certification Mark when purchasing DEF.
API Diesel Exhaust Fluid Certification Mark is the trade mark of
API (American Petroleum Institute).

FOREWORD

ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION

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