Inspection Of Def Level And Replenishment - IHI IC75-2 Operation Manual

INSPECTION OF DEF LEVEL AND REPLENISHMENT

Regarding the urea SCR system
• The urea SCR (Selective Catalytic Reduction) system reduces the amount of toxic nitrogen
oxides (NOx) present in exhaust gas by decomposing NOx into water and nitrogen inside the
post-processing unit by means of the emission of DEF into exhaust gas.
Regarding DEF
• The fluids that are effective in reducing NOx present inside the post-processing unit are
collectively referred to as DEF (Diesel Exhaust Fluid).
• DEF is an aqueous urea and is commonly referred to as AdBlue mainly in Europe.
AdBlue is a registered trade mark of the German Association of the Automotive Industry
(VDA: Verband der Automobilindustrie).
Regarding specified DEF
• As for DEF, use the one that conforms to the Japanese
Industrial Standards (JIS K 2247-1) or the International
Organization for Standardization (ISO 22241-4).
Never replenish other fluids than the specified DEF.
Also, never replenish DEF diluted with water.
(The new machine is shipped with about 10 liters of
AdBlue in its tank.)
• DEF must be stored in an airtight container in a well-ventilated location not exposed to direct
sunlight.
DEF freezes at -11°C. If DEF freezes inside a container, it may rapture the container by
volume expansion.
• If a fluid other than DEF (AdBlue) or DEF diluted with water is pured into the tank, it may
cause the DEF pump and/or the DEF injector to fail. If a fluid other than the specified DEF is
pured into the tank by mistake, do not turn the starter key to the "ON" position and
immediately contact IHI's sales service dealer for proper instructions.
• In the urea SCR system, the pump returns DEF to the tank even after the engine has
stopped. Never disconnect the battery immediately after the engine has stopped or
remove the connectors including the harnesses. Similarly, never remove the DEF pipe
immediately after the machine has stopped. When conducting maintenance and other
related work, be sure to allocate ample time before starting such work.
IC75-2 ENG
MAINTENANCE
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