NOTE: Use of anti-freeze solution is not allowed and not useful at all!
Water is removed from the system by draining the water trap periodically and by cleaning the fuel tank
before frost season (see also actions before winter).
WARNING:
Do not make any work at the common rail high pressure fuel system when the engine is
running. Wait at least 30 seconds after stopping the engine .The first high pressure
component has to be loosened slowly, so that the pressure inside the fuel system can
adjust to ambient pressure. If the jet of high pressure fuel contacts your skin, fuel
penetrates the skin causing severe injuries. Get medical help immediately!
NOTE: Only general instructions for servicing and repair work relating to the fuel system are provided.
Therefore there are no instructions on repairing the high-pressure pump, injectors or rail, which should only
be performed by someone with special training and the necessary special tools and gauges. All servicing
and repair work relating to the fuel system requires particular care and cleanliness!
1.3.13 SCR-system
1.3.13.1 SCR system overview
AGCO POWER engines have exhaust gas treatment with SCR technology (Selective Catalytic Reduction).
In SCR technology a liquid called DEF (Diesel Exhaust Fluid) is injected into exhaust gases. DEF liquids are
specified in standards DIN 70070 and ISO 22241. Most commonly known trademarks of DEF are AdBlue,
Air1 and Greenox. The heat of exhaust gases converts DEF to ammonia and carbon dioxide. After this the
ammonia reacts with nitrogen oxides in catalyst reducing them to harmless nitrogen gas and water steam.
The DEF consumption is approximately 6 - 8 % of the fuel consumption. The DEF tank and pipes are
heated so system works also in low temperatures. If DEF freezes, it is automatically defrosted when the
engine is started. The congealing point of DEF with 32,5 % urea concentration is -11 °C.
CAUTION:
Make sure that genuine DEF (DIN 70070 or ISO 22241 certified) is used as a reducing
agent. If urea quality sensor detects a problem related to urea quality, it will alert the
engine control system via CAN message thus causing the engine to run under degraded
mode.
See instructions of the machine for details of filling up, location and capacity of the DEF tank.
CAUTION:
The storage of DEF must be done under 30°C, avoiding direct sunlight.
CAUTION:
Make sure that genuine DEF (DIN 70070 or ISO 22241 certified) is used as a reducing
agent. Diluting of DEF or mixing it with other substances is not allowed, it may damage
the catalyst!
CAUTION:
Even small amounts of diesel fuel in DEF tank may damage the gaskets of the SCR
system!
CAUTION:
Be careful when handling DEF. DEF is aggressive to some materials and corrosive to some
metals. DEF becomes crystalline when in contact with air. In case of a spillage rinse with
plenty of water and dry with a clean cloth.
NOTE: Engine with SCR system meets EU97/68/EC Stage lllB and EPA 40 CFR 1039 Tier 4i emission
requirements. Engine without SCR system meets EU97/68/EC Stage 2 and EPA 40 CFR 89 Tier 2 emission
requirements.
1. Introduction
1-22 4th Generation Engines
8370 79492
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