Selective Catalytic Reduction (SCR) System—Final Tier 4/Stage IV Engine

To determine tractor engine type, see Engine Serial Number in Identification Numbers section of this Operator’s Manual.

It is unlawful to tamper with or remove any component of the aftertreatment system. It is also unlawful to use Diesel Exhaust Fluid (DEF) that does not meet the specifications provided or to operate the vehicle with no DEF.

Using incorrect or unapproved aftertreatment components can cause damage to vehicle’s aftertreatment system and reduce ability of aftertreatment system to function correctly. Never interchange aftertreatment components between Interim Tier 4/Stage III B and Final Tier 4/Stage IV equipped vehicles.

SCR system monitors quality of DEF flowing through it. If a fluid other than DEF at correct urea concentration is detected, system will display a diagnostic trouble code and a four hour internal counter starts. After four hours, engine power and speed are derated.

SCR system supplies Diesel Exhaust Fluid (DEF) to engine aftertreatment system. DEF works in conjunction with tractor aftertreatment components to reduce emissions. See Diesel Exhaust Fluid (DEF) section of this Operator’s Manual for specifications and information about DEF.

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Tractor electronic systems monitor DEF level to assure proper performance. Corner Post Display shows current DEF level (A). When quantity of DEF reaches reduced levels, systems change tractor operation. Refilling DEF tank will cause system to return tractor to normal operation. Refilling DEF tank every time tractor is refueled is recommended. See Refilling Diesel Exhaust Fluid (DEF) in the Diesel Exhaust Fluid (DEF) section of this Operator’s Manual.

DEF level and operation changes:

Normal Operation (B)—When DEF level is within this range, DEF symbol is on and tractor operates normally. Always maintain fill within this level for uninterrupted performance.

Low DEF Level 1 (D)—When DEF level drops to first red bar, DEF indicator light (C) flashes and a diagnostic trouble code is displayed and alarm sounds. Tractor operates normally, but refill of DEF tank is recommended.

DEF indicator light continues to flash at Low DEF Level 2 on tractors equipped with 15 L engines.

Low DEF Level 2 (E)—When DEF level falls below this point, DEF indicator light stops flashing and constantly illuminates. A diagnostic trouble code is displayed and alarm sounds; engine power and speed are derated. Refill DEF tank and restart tractor to resume normal operation.

DEF freezes at -11°C (12°F) and will not flow to the SCR system. Tractor systems sense low temperature and allow engine to start, even with no DEF flow. Engine coolant is used to thaw fluid in DEF tank when engine is running. If system senses that DEF has thawed and SCR system is operating normally within forty minutes, tractor is allowed to continue operation. If DEF flow is not sensed within forty minutes, a diagnostic trouble code is displayed and a four hour internal counter starts. After four hours, engine power and speed are derated. Freezing and thawing of DEF does not degrade it.

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