LeeBoy 685D - Selective Catalytic Reduction (SCR) System

Avoid prolonged and repeated skin
contact with used antifreeze as contact can cause
skin disorders or injury. Wash thoroughly after any
contact.
ALWAYS wear eye protection when
using compressed air to prevent injury.
To check the radiator or add coolant:
1. Open the access compartment to reach the radiator
surge tank cap. (Figure 5-13)
2. Remove the cap to check radiator level ONLY
WHEN UNIT IS COOL. Coolant level should be
visible.
3. If coolant level is low, add coolant. DO NOT overll.
Selective Catalytic Reduction
(SCR) System
The SCR system is an efcient, effective means of
ltering dirt and other contaminates for optimum engine
performance and reducing air pollution from exhaust
emissions. (Figure 5-14) The SCR system precisely
injects Diesel Exhaust Fluid (DEF) into the engine’s
exhaust system to transform those toxic exhaust
gases into harmless water vapor and nitrogen. SCR
technology is also cost-effective and fuel-efcient.
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.
NEVER tamper with or remove any
emission-related component under penalty of law.
DO NOT pressure wash or steam
clean this unit to avoid damaging the components.
Use compressed air to remove any loose debris.
DEF Tank
DEF Pump
SCR System
Figure 5-14. SCR System
Diesel Exhaust Fluid (DEF)
System
DEF is a mixture pure urea and de-ionized water
that is injected into the exhaust stream by the SCR
system. The DEF system is an efcient, effective means
of ltering dirt and other contaminates for optimum
machine performance and reducing air pollution from
exhaust emissions. 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.
The DEF tank is located on the right side of the grader
inside the smaller access door behind the operator
station. (Figure 5-15) DEF tanks always have a blue
cap with a smaller ll neck to prevent erroneously lling
with the wrong uid.
Maintenance
LeeBoy 685D Motor Grader5-16