HOSE AS 4560250 - Caterpillar

Hydrocarbon Mitigation
The hydrocarbon mitigation is a feature to protect the DOC against temperatures below 325° C (617° F). Temperatures below this range can damage the aftertreatment of the machine. The initial occurrence displays as a warning and then if temperatures do not increase by the operator or strategy, the machine will go into shutdown. Messages appear sequentially as follows:
First : Key cycle to warning
Secondary : Warning to shut downIf the warning messages are not acknowledged, then the shutdown counter begins. Once the engine has shutdown for low exhaust temperatures, the 173-18 Engine Exhaust Manifold #1 Temperature #1: Low - Moderate Severity (2) will return until the engine has successfully reached target temperatures.Once exhaust temperatures below 325° C (617° F) are observed for an hour, the Hydrocarbon Mitigation feature begins and the following conditions below become active.Cylinder Cutout Strategy
The cylinder cutout starts at 1000 rpm. The hydrocarbon mitigation monitors the exhaust and intake target temperatures and increases speed if temperatures are not achieved in intervals. The intervals are 20 minutes and with 200 rpm increments. The speed range for the strategy is 1000 rpm to 1800 rpm with a minimum run time of 100 minutes.Note: This strategy only runs in non-work mode.The strategy success criteria is based on the following:
Intake air manifold temperature over 10° C (50° F)
Exhaust manifold temperature over 325° C (617° F)If successful, the machine will continue to run indefinitely at the current rpm until taken out of non-work mode.Exhaust Temperature Low Code Actions
Once the 173-18 Engine Exhaust Manifold #1 Temperature #1: Low - Moderate Severity (2) warning message is shown, there are two actions the can be taken to remove them:Non-Work Mode
Put the machine in Non-Work mode.
This will allow Hydrocarbon Mitigation to start automatically and attempt to achieve the target temperatures for the intake and exhaust.
If the strategy does not achieve target temperatures, the engine will return to low idle for 60 minutes and then Hydrocarbon Mitigation begins.
If the strategy continues to fail, the next action will need to be taken to clear the codes.Non-Work Mode Failure
If the machine is being used at the time of the warning message and cannot be put into Non-Work mode, then raise the intake and exhaust temperature for their time thresholds.
Intake air manifold temperature is greater than 10° C (50° F) for 10 minutes continuously
Exhaust manifold temperature is greater than 325° C (617° F) for 30 minutes continuously
Blender - Ideal time to perform this is during the 60 minute low time after a Hydrocarbon Mitigation failure.Note: Hydrocarbon Mitigation will always start mitigation.Partial Load Operation
Extended operation at reduced load (less than 30%) may cause increased oil consumption and carbon buildup in the cylinders. Extended operation at reduced load may also cause fuel to slobber through the exhaust system. A loss of power and/or poor performance may result.To maintain engine efficiency and performance, apply 70% load to the engine on an hourly basis. Operating the engine at a load level that is greater than 30% will also maintain engine efficiency and