SECTION 4 - MACHINE OPERATION
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4-11
4.5
SELECTIVE CATALYTIC REDUCTION (SCR) - MACHINES
USING DIESEL EXHAUST FLUID (DEF)
Selective Catalytic Reduction (SCR) is an emissions control used
in diesel engines and requires operator interaction to ensure
proper operation of the system.
The system injects liquid through a special catalyst into the
exhaust stream of a diesel engine. The liquid is automotive-grade
urea, otherwise known as Diesel Exhaust Fluid (DEF). The DEF sets
off a chemical reaction that converts nitrogen oxides into nitro
-
gen, water and carbon dioxide (CO2), which is then expelled
through the engine exhaust pipe.
For peak operation, the SCR system must be cleaned using one of
two methods, Standstill Cleaning and Maintenance Standstill
Cleaning. Standstill Cleaning is any cleaning requested by the
engine outside of the regular maintenance window (for example,
if the system detects crystallization in the DEF solution). Mainte
-
nance Standstill Cleaning is cleaning requested by the engine on
the regular maintenance interval.
NOTE:
The system will reset the maintenance interval back to 0 hours
after Standstill or Maintenance Standstill cleaning events are
performed.
Standstill Cleaning
The following conditions must be met to perform Standstill
Cleaning.
• Machine must be stationary
• Boom in the stowed position
• No personnel in platform
• Engine must be idling
• Coolant temperature must be above 104° F (40° C)
• Diesel Exhaust Fluid (DEF) tank must not be frozen
• Machine in Ground Station mode
1.
The Selective Catalytic Reduction Indicator
will flash when standstill cleaning is required.
2.
Move the machine to an suitable area free of flammables
and personnel that could be exposed to hot exhaust.
3.
Launch the cleaning process by pressing the SCR button on
the Ground Console for 3 seconds. The Indicator Gauge will
display the following screen.
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