Exhaust System Cleaning; Activating The Exhaust Aftertreatment Functions - MacDon M2170NT Operator's Manual

If the oil pressure drops below the preset level of 52 kPa (7.5 psi), the HarvestTouch
fault code to identify the issue.
If the red STOP ENGINE light illuminates, stop the engine IMMEDIATELY and investigate.
If the amber CAUTION light illuminates, stopping immediately is optional. You may continue operations and investigate
later, but you are STRONGLY advised to monitor the situation carefully.

Exhaust System Cleaning

The exhaust aftertreatment system uses diesel exhaust fluid (DEF) and selective catalyst reduction (SCR) technology to
reduce the emission of nitrogen oxides (NOx). The process involves injecting DEF (a nitrogenous compound which
decomposes into ammonia) into the exhaust over a catalyst. The ammonia reacts with NOx, producing harmless nitrogen
and water. However, prolonged use of DEF can lead to the buildup of crystallized DEF in the emission system. SCR
technology is used to heat the exhaust system to remove crystallized DEF.
Automatic exhaust system cleaning events maintain the performance of the aftertreatment system by increasing exhaust
temperatures in order to remove the buildup of crystallized DEF. Automatic cleaning occurs any time during machine
operation as long as the INHIBIT SCR CONDITIONING switch is OFF. Turn on the INHIBIT SCR CONDITIONING switch if the
environment is not suitable for high exhaust temperatures (for example, when the windrower is inside a building). The
INHIBIT SCR CONDITIONING switch is intended as a temporary measure; if the INHIBIT switch is left on for an extended
period, the windrower's computer will derate the engine's performance until manual SCR conditioning is performed.
Activate the MANUAL SCR CONDITIONING exhaust system cleaning if the automatic exhaust system cleaning was
deactivated during normal operation. Engine speed may vary between 1000 and 1400 rpm during manual exhaust system
cleaning.
For more information on interacting with the exhaust system cleaning system, refer to
Aftertreatment Functions, page

Activating the Exhaust Aftertreatment Functions

Follow the instructions in this section to access the exhaust aftertreatment functions on the HarvestTouch
1. From the Home page, press MENU (A) and then press
EMISSIONS (B). The manual / inhibit SCR conditioning
switches will appear.
262171
OPERATION
200.
™
Display displays an engine telltale
Figure 5.23: HarvestTouch
200
Activating the Exhaust
™
Display.
B
A
™
Display
Revision A