Milton CAT D8T Tier 4 Interim-Stage IIIB - Manual (Page 4)

Emissions Technology
Reliable, integrated solutions
Cat NOx Reduction System
The Cat NOx Reduction System captures and cools a small
quantity of exhaust gas, then routes it into the combustion
chamber where it drives down combustion temperatures
and reduces NOx emissions.
Aftertreatment Technologies
To meet Tier 4 Interim/Stage IIIB emissions standards and
beyond, Cat aftertreatment components have been designed
to match application needs. System components include a
Diesel Oxidation Catalyst (DOC), which uses a chemical
process to convert regulated emissions in the exhaust system,
and a Diesel Particulate Filter (DPF) that traps particulate
matter that is carried into the exhaust stream.
The DOC, DPF and Cat Regeneration System are contained
in a Caterpillar designed Clean Emissions Module (CEM) that
protects the components, minimizes the aftertreatment footprint
and simplifies maintenance. For high debris applications that
require thermal shields on exhaust components, an optional
insulated CEM is available for the D8T (available mid 2011).
Cat Regeneration System
The Cat Regeneration System is designed to work
transparently, without any interaction needed from the
operator. Under most operating conditions, engine exhaust is
hot enough to oxidize soot through passive regeneration. If
supplemental regeneration is needed, the Cat Regeneration
System elevates exhaust gas temperatures to burn off soot
in the Diesel Particulate Filter (DPF). This is a process that
happens automatically, but the operator can initiate the cycle
when convenient or interrupt regeneration as needed. A soot
level monitor and regeneration indicator lights are integrated
into the D8T dash display.
Key Off Regeneration – Optional Key Off Regeneration
allows the operator to initiate a regeneration cycle after the
key has been turned off. If a cycle takes place, the engine will
complete regeneration, followed by a cool down period prior
to shutting down.
Delayed Engine Shutdown – Delayed Engine Shutdown feature
is available to allow the machine to cool immediately after a
heavy work load or regeneration cycle.
Engine Idle Shutdown Timer – An optional Engine Idle Shutdown
timer will sound a warning and shut down the engine after the
machine has been idling for a pre-set period of time.
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