Komatsu WA600-8, Руководство по эксплуатации и техническому обслуживанию, Страница: 220 / 554

Komatsu Closed Crankcase Ventilation (KCCV)
The KCCV is a device to clean the gas discharged from the en-
gine crankcase and return it to the engine air intake system.
NOTICE
• The KCCV filter element needs to be replaced every
2000 hours.
For the replacement procedure, see “METHOD FOR
REPLACING KCCV FILTER ELEMENT (4-78)”.
• 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 Komatsu genuine KCCV filter element.
• The filter element cannot be cleaned.
Never reuse the filter element. Even if it is cleaned, its
filtering performance may decrease and it can cause
an engine failure.
HANDLE UREA SCR SYSTEM WARNING
Urea SCR system is a device which converts toxic nitrogen oxides (NOx) in the exhaust gas into harmless nitro-
gen and water. By spraying DEF into the exhaust gas, it decomposes and hydrolyzes to form ammonia (NH3)
and the ammonia selectively reacts with nitrogen oxides for the conversion to nitrogen and water.
The Komatsu Urea SCR System continuously monitors its operation conditions and stores information on inap-
propriate operations including malfunctions. The information is used for system diagnostics and also for Induce-
ment required by the authorities on engine systems that use Urea SCR systems. Inducement is intended for the
operator to take prompt actions to maintain and correct inappropriate behaviors of Urea SCR systems by utiliz-
ing visible and audible alerts , and engine power derate in addition. Alerts in Inducement of the Komatsu Urea
SCR System progresses step by step starting from visual indications on the machine monitor and audible
sounds to engine power derate to avoid getting into unsafe conditions.
The Komatsu Urea System also monitors recurrences of abnormalities of the system. Inducement in the recur-
rences is activated when another abnormality occurs within 40 hours after the first abnormality is fixed.
The Komatsu’s Urea is composed of two major systems, which are the DEF system and the SCR catalyst Ass’y.
EXPLANATION OF COMPONENTS OPERATION
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