LeeBoy 685D - Diesel Exhaust Fluid (DEF) System and Regeneration

burn off any soot and undesired combustion gas to
signicantly reduce toxic emissions as required by Tier
4 Final engine standards.
Maintenance is kept at a minimum with a crankcase
ventilation breather that requires no lter element, and
a Cummins Filtration Direct Flow air cleaner that has a
higher dust capacity. It is particularly important that the
operator understand the regeneration process before
operating the grader.
This engine uses Diesel Exhaust Fluid (DEF), (known as
AdBlue® in Europe), a critical element of its Selective
Catalytic Reduction (SCR) after-treatment system.
Alerts and messages illuminate on the PV485 digital
display controller (described in the following pages)
when the DEF tank needs to be lled or the regeneration
process needs to be performed.
When the soot saturation in the exhaust system reaches
a certain level, the onboard engine ECU (Engine
Control Unit) will activate a regeneration cycle. During
normal operation, the regeneration process begins
automatically. This engine requires little to no operator
interaction, but under certain circumstances, the
operator may have to initiate the regeneration process.
The exhaust system cleaning light will illuminate during
regeneration. It is important not to shut off the engine
as the regeneration cycle will fail and could possibly
damage the engine. Once regeneration is complete,
the light will turn off. If the regeneration cycle fails, the
ECU may attempt a second regeneration.
Use only Ultra-Low Sulfur Diesel (ULSD) with a maximum
sulfur content of 15 ppm or less in this machine. Failure
to do so will result in damage to the engine and after-
treatment system within a short period of time.
Modifying or disconnecting any
emission-related component will subject you to
government penalties and void your warranty.
Tampering with emission controls is in violation of
federal law, and can result in serious civil penalties.
REGENERATION
(REGEN)
Regeneration is the term given to the
cleaning process where the exhaust
temperature is raised to safely
Diesel Exhaust Fluid (DEF)
After-Treatment System
The LeeBoy 685D Motor Grader is equipped with a
DEF after treatment system that treats post-combustion
exhaust gases prior to tailpipe emission. This system
allows greater engine power, higher torque and fuel
economy while decreasing exhaust pollution. The
DEF system is an important factor in operating the
machine. Keeping the DEF tank lled is critical to engine
operation. (Figure 4-3)
DO NOT operate the machine with
an empty DEF tank to prevent serious engine and
emission system damage.
DEF Tank
Filler Cap
Figure 4-3. DEF Fluid Tank
If the DEF tank level runs low (below 15 percent) during
operation, a solid yellow DEF warning symbol will
illuminate on the PV485 controller screen. If the level
drops to ve (5) percent, the warning icon ashes yellow.
Engine torque will be reduced 50 percent and engine
speed will be reduced 40 percent after 45 minutes.
If the operator continues to ignore the warning and
the DEF tank is still not relled after an additional 45
minutes, the warning icon will illuminate red and ash
continuously. At this point, there will be no available
torque--the engine will only idle.
In either of these conditions, relling the DEF tank will
restore engine performance.
Operation
LeeBoy 685D Motor Grader4-6