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00 INDEX AND FOREWORD
ACTIONS TAKEN TO MEET EXHAUST GAS REGULATIONS
This machine conforms to either regulation of Tier4 Final (North America).
This machine is equipped with the following two exhaust gas treatment systems:
•
Komatsu Diesel Particulate Filter (hereafter KDPF): A device which captures soot in the exhaust gas to pu-
rify exhaust gas. This process performs the combustion of soot referred to as "regeneration".
•
Urea SCR system: A device which decomposes the toxic nitrogen oxides (NOx) mixed in the exhaust gas
into harmless nitrogen and water. Spraying aqueous urea solution 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.
DEF is the abbreviation for Diesel Exhaust Fluid and may be used as the aqueous urea solution for the SCR
system. Commercial DEF that is API approved and meets all the requirements defined in ISO 22241-1. This
solution will be represented as DEF throughout this manual.
About DEF
DEF is necessary for the urea SCR system. DEF is a colorless transparent 32.5% aqueous urea solution. Urea
as main constituent is a material which is used for cosmetics, medical and pharmaceutical products, and fertiliz-
er, etc.
If you add any additional additive agents or water to DEF and use it, the devices will not function properly, and
conformance to the exhaust gas regulations will be lost. In addition, it will cause failure of the machine.
In North America, use DEF (Diesel Exhaust Fluid) which is cer-
tified by API (American Petroleum Institute). The certified DEF
has the API DEF Certification Mark shown as follows. Look for
the API DEF Certification Mark when purchasing DEF. API Die-
sel Exhaust Fluid Certification Mark is the trade mark of API
(American Petroleum Institute).
PC290LL-11
ACTIONS TAKEN TO MEET EXHAUST GAS REGULATIONS
00-39
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