Maintenance
LeeBoy 8608 Commercial Paver5-20
DEF (Diesel Exhaust Fluid)DEF (Diesel Exhaust Fluid)
DEF is a mixture of pure urea and de-ionized water that
is injected into the exhaust stream by the SCR system.
Temperature and humidity affect DEF consumption,
with hot and dry climates resulting in greater DEF
consumption. Typically, machines will consume an
amount equal to 2 - 10 percent of the fuel you burn.
DEF uid is available at most truck stops, diesel engine
dealerships, auto supply stores and large gas stations.
To nd DEF locations in the U.S., go to http://www.nddef.
com/def_map.php.
DEF contains urea, therefore, wear
eye protection, gloves and appropriate protective
clothing when lling the tank and handling DEF.
Avoid skin contact. Use only with adequate
ventilation and avoid breathing vapor or mist. DO
NOT get the substance in your eyes. In case of
contact, immediately ush eyes for a minimum of
15 minutes. ALWAYS wash hands thoroughly after
handling DEF.
DO NOT use DEF after its expiration
date. Always dispose of DEF in compliance with
federal and local environmental laws.
The DEF tank is located just inside the right engine
access door. (Figure 5-14 on the previous page.)
DEF tanks always have a blue cap with a smaller ll neck
to prevent erroneously lling with the wrong uid.
It is critical that you prevent contamination
entering into the SCR system. Even trace amounts
of contaminants introduced into the SCR system can
cause damage.
• Always clean around the fill neck and dispensing
nozzle when refilling the DEF tank. If you’re refilling
the DEF tank often, the opportunity for airborne dust
and dirt ingestion is high.
• Be especially careful handling DEF at the job site.
While it’s a good idea to have DEF on hand, especially
in rural areas, the risk of contamination is higher. Be
sure the ambient temperature is within the correct
storage range if bringing DEF to the work site.
DEF StorageDEF Storage
DEF is a vital element in engine performance. Proper
storage and use will help to insure maximum engine
performance and a long, trouble-free experience with
the installed engine.
DEF is a mixture of pure urea and de-ionized water that
is injected into the exhaust stream by the SCR system.
Temperature and humidity affect DEF consumption,
with hot and dry climates resulting in greater DEF
consumption. Temperatures also affect the quality of
DEF and can impeded peak performance.
• DEF freezes at 12°F. In winter months it should be
stored above this temperature. If DEF does freeze in
the machine tank during overnight storage between
jobs, onboard systems enter into Thaw Control Mode
to heat the DEF back to usable temperatures. Engine
maximum torque may be limited while DEF is frozen.
• Temperatures above 86°F causes DEF to break
down, which releases ammonia into the onboard DEF
tank or storage container. This breakdown of the
DEF affects the quality of the DEF, which could yield
warning messages or reduce engine performance
of the machine, and may increase pressures within
the storage containers. During DEF ll, or after any
prolonged storage of DEF, if the smell of ammonia is
present, the DEF uid has started to break down and
LeeBoy recommends it be changed or discarded.
If DEF is stored or used above 86°F, the DEF life will
be reduced. DEF storage recommendations include:
• Store DEF in a clean, dry, well-sealed container
in a well-ventilated location away from dust and
direct sunlight.
• Keep DEF away from any container of gasoline
and diesel fuel or other lubricants.
• Store DEF in a dedicated container that has not
been used with other uids, including funnels
and hoses.
• If using pumps to ll DEF tanks, ensure the
seals, O-rings and ttings on the dispensers are
DEF-compatible.
• The best practice is to pour directly from the
DEF container into DEF tank.
• Use a container size that allows DEF
consumption in 2 months.
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