Komatsu H75051 Operation & Maintenance Manual page 201

OPERATION
and injection while heating continues. Once the ambient temperature rises above a temperature where DEF
system becomes functional, it resumes operation automatically.
Short duration of white plume given off from the tail pipe may be visible at and shortly after engine start-up in
cold weather, but this is not malfunction.
Inducement strategy when the DEF tank Level becomes low
When the amount of DEF fluid in the tank goes low, the Inducement strategy will be activated.
If Inducement starts, add DEF to the DEF tank immediately.
The DEF level caution lamp (1) on the monitor lights up, the
audible alert starts, and the Action level is displayed, and In-
ducement strategy is activated. Inducement strategy includes
engine output deration, speed limitation, or other warning ac-
tions intend to prompt the operator to maintain or repair SCR
system. The Inducement strategy progresses in 4 levels from
Warning, Continuous Warning, Low level Inducement and Se-
vere Inducement.The DEF level caution lamp (1) on the ma-
chine monitor will light up, audible alert will start, then Action
level will be displayed on the machine monitor, and engine
power will be derated in steps.
In Action Level "L03 (Low level Inducement)" and "L04 (Severe Inducement)" engine power will be derated.
When Action Level "03" or "04" is displayed, move the machine to a safe place and add DEF.
The content of the warning can be checked on the "SCR Information" 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.
"SCR Information" screen displays the DEF level caution lamp
(1), the DEF level gauge (2), information on the Urea SCR Sys-
tem condition (3), and the current status of Inducement (4).
If Inducement starts, stop the machine in a safe place and add
DEF.
• Warning:
2 gradations of the DEF level gauge light up in the red
range.
The DEF level caution lamp (1) lights up in red.
No audible alert.
No Action level is displayed.
Press the menu switch to display the "SCR Information"
screen.
EXPLANATION OF COMPONENTS
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