Service - 206 JT40/JT40 All Terrain Operator’s Manual
Recommended Lubricants/Service Key
Exhaust Cleaning - HRC Only
This engine has a Selective Catalytic Reduction (SCR) system that uses a small amount of DEF to convert
NOx emissions in the exhaust into nitrogen and water. The SCR system cleans itself automatically, unless
it is manually inhibited by the operator.
Automatic exhaust cleaning happens during normal machine operation when sensors in the
engine determine the need. During an engine exhaust cleaning cycle, engine exhaust can reach
high temperatures. When this happens, the high exhaust temperature icon will light.
If the jobsite is in an area where high exhaust temperature might cause a problem, inhibit exhaust
cleaning (see “Exhaust cleaning activation key” on page 57) for the duration of the job and return
to automatic cleaning when the job is finished. The exhaust cleaning inhibited icon will light and
remain on until the system is returned to automatic exhaust cleaning mode.
The exhaust cleaning icon will light when the system is inhibited and an exhaust cleaning cycle is
needed.
• The icon will light when an automatic cleaning is needed. If the area will allow it, return the
unit to automatic cleaning mode and let it run automatically.
• The icon will flash when a manual cleaning is needed. Set the engine to low throttle with no load and
initiate the manual exhaust cleaning cycle. The light will continue to flash until the manual exhaust
cleaning cycle is finished (approximately 30 minutes).
• A manual exhaust cleaning cycle is required after automatic exhaust cleaning has been inhibited
multiple times. If manual cleaning is not done when indicated, the engine will derate.
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