Komatsu H75051, Operation & Maintenance Manual

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• Severe Inducement:
The audible alert sounds in “Continuous alarm”.
No gradation of the DEF level gauge lights up .
The DEF level caution lamp (1) lights up in red.
The Action level “L04” is displayed in red (5).
Press the menu switch to display the “SCR Information”
screen.
When all gradations of the DEF level gauge go off, DEF re-
filling amount is approximately 14 ℓ to fill up the DEF tank.
Inducement status (4): “4 Engine power is under heavy de-
ration.”
Engine power can be restored temporarily from power derate. This engine power restoration works only
when the Inducement status is “Severe Inducement” and relieves back temporarily to the power deration of
the “Low level Inducement”. The operator can restore engine power through the machine monitor. For the
engine power restoration procedure, refer to the section of “Temporary Restoration from Inducement” in this
manual. Once in “Severe Inducement” and it becomes necessary to restore engine power, use the engine
power restoration function to move the machine to a safe place and add DEF.
Inducement strategy when abnormalities are detected in the Urea SCR System
devices (Except abnormalities in the KDPF and the EGR system)
If any abnormality is detected in the DEF quality or in the Urea SCR system, the Inducement strategy is activa-
ted.
The inducement strategy progresses in 4 levels, “Warning”,
“Continuous Warning”, “Low level Inducement” and “Severe In-
ducement”. The Inducement strategy includes visual alert by
the DEF system caution lamp (1), and Action Level displayed
on the machine monitor (2), and the audible alert by a buzzer
and stepwise engine power derates. Engine power deration
starts with Action Level “L03 (Low level Inducement)” and ad-
vances to further deration when “L04 (Severe Inducement)” is
displayed. If “L03” is displayed, move the machine to a safe
place and contact your Komatsu distributor.
The content of the warning can be checked on the “SCR Infor-
mation” screen of the user menu.
Perform the following procedure.
Press the menu switch on the standard screen to display the
“SCR Information” screen of the user menu.
After a lapse of 3 seconds to stop the machine, “SCR Informa-
tion” screen is displayed.
OPERATION EXPLANATION OF COMPONENTS
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