Aftertreatment DPF spark assisted systems use active regeneration. Regeneration takes place after a certain number of en-
gine operating hours and begins when an air/fuel mixture is injected into the thermal regenerator and raises the temperature
inside the unit to the point where the soot oxidation takes place.
Conventional exhaust aftertreatment systems are used in highway and certain vocational applications. Spark assisted ex-
haust aftertreatment systems are used mainly in refuse collection applications.
Depending on how the vehicle is set up, aftertreatment DPF regeneration can occur while the vehicle is being driven (re-
ferred to as a "moving" regeneration) or when the vehicle is parked and idling (referred to as a "parked" regeneration).
CAUTION
When aftertreatment DPF active regeneration occurs (with either system), the temperature of the exhaust will be elevated.
DO NOT park the vehicle with the exhaust outlet under low hanging overhead flammable objects such as trees, awnings,
etc., that could be damaged by elevated exhaust gas temperatures (EGTs). DO NOT remove the diffuser.
CAUTION
If the vehicle is in a location that may be hazardous when an aftertreatment DPF active regeneration begins (i.e., in close
proximity to flammable materials or gases), the regeneration should be stopped by pushing the DPF switch to the "Stop
Regeneration" position.
If an active regeneration is stopped by the vehicle operator, it should be initiated at a later time when the vehicle is in a safe
location. However, if an active regeneration is stopped repeatedly, the vehicle may need to be taken to a MACK service fa-
cility. The service facility will use a service tool to manually initiate the regeneration.
WARNING
For chassis equipped with a heated dump body, be aware that temperature around the area where the exhaust en-
ters the body, as well as the product contained in the body, may be elevated, particularly during aftertreatment
DPF regeneration.
Extended Idling and Aftertreatment System Conditioning
Extended idling performed on this vehicle equipped with an exhaust aftertreatment system should be carried out at a low en-
gine idle speed. There is no benefit to using a raised engine idle speed for extended idling. The only exception is for active
power takeoff (PTO) . Utilizing an engine speed above 1,300 rpm is recommended for vehicles which perform extended
idling with an active PTO.
During periods of extended idling, normally greater than 8 hours, the conventional aftertreatment diesel particulate filter
(DPF) system needs to perform a routine conditioning cycle. The conditioning cycle is controlled by the engine control mod-
ule (ECM) and will start and stop automatically as needed. The DPF conditioning is required to maintain normal exhaust
aftertreatment system function and should not be stopped. DPF conditioning will not occur on aftertreatment DPF spark as-
sisted systems.
During these events the engine speed (RPM) will increase to approximately 1,050 - 1,400 rpm, for non-PTO , in order to com-
plete the exhaust aftertreatment conditioning cycle. Exhaust gas temperatures (EGT) will also elevate slightly but remain
much lower than that reached during aftertreatment DPF regeneration and present no danger.
If a compatible driver display is available a message will be displayed when the conditioning cycle is in progress. The mes-
sage indicated in the driver's display will be "ATS Conditioning in Progress, No Action Required." If no driver display is avail-
able there will be no indication of an DPF conditioning event except for the automatic increase in RPM.
Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR
USA139046859 Date 5.2017 Body Builder; Engine, MP7, MP8, and MP10 Page 11 (43)
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