Komatsu D37EX-24 Operation & Maintenance Manual page 160

EXPLANATION OF COMPONENTS
2.
Tighten the bolts (1) (6 pieces) on the lower part of the ra-
diator grille.
Komatsu Closed Crankcase Ventilation (KCCV)
KCCV is a device to clean the gas discharged from the engine
crankcase with the filter element and return it to the engine air
intake system.
NOTICE
• The KCCV filter element needs to be replaced every
2000 hours.
• If the engine is operated without KCCV filter element
or if a filter element other than the Komatsu genuine
element is used, the engine sucks oil and foreign ma-
terial which can cause a failure. Always install Komat-
su genuine KCCV filter element.
• The filter element cannot be flushed. Never reuse the
filter element since it can cause a performance decre-
ment of engine, and it result in a failure even if it is
cleaned.
HANDLE UREA SCR SYSTEM WARNING
• Exhaust gas temperature may increase during regeneration and remain very hot after the end of re-
generation.
Do not come near the exhaust pipe outlet nor the aftertreatment devices.
Do not put any combustibles near the outlet of the exhaust pipe nor the aftertreatment devices.
• Disable the regeneration system while the machine operates in an environment containing flamma-
ble materials.
The Urea SCR system device sprays DEF into the exhaust gas to convert toxic nitrogen oxides (NOx) from ex-
haust gas into harmless nitrogen and water. DEF decomposes and hydrolyzes to produce ammonia (NH3),
which selectively reacts with nitrogen oxides to convert nitrogen and water.
The Komatsu Urea SCR System continuously monitors machine operation conditions and gathers information
on defective operations such as malfunctions. The information is used for system diagnostics and also for In-
ducement, required on engine systems that use Urea SCR systems. Inducement is intended for the operators to
take prompt procedures to maintain and correct inappropriate behaviors of Urea SCR systems. Alerts in Induce-
ment of the Komatsu Urea SCR System progress step by step. It starts with visual indications on the machine
monitor with audible sounds to engine power deration to avoid dangerous conditions.
The Komatsu Urea System also monitors recurrences of defective operations of the system. Inducement is acti-
vated when another defective operation occurs less than 40 hours after the first defect is repaired.
When the purification function of the Komatsu Urea System is deteriorated from the machine operating condi-
tions, regeneration may activate.
3-102
k k
WARNING
OPERATION