Komatsu H75051 Operation & Maintenance Manual page 88

EXPLANATION OF COMPONENTS OPERATION
DEF LEVEL CAUTION LAMP
DEF level caution lamp alerts when DEF tank level becomes
low.
Whenever the caution lamp lights up in red, immediately add
DEF.
Fault conditions that result in activation of the Inducement strat-
egy for engine derates to prompt to maintain or repair the emis-
sion control system.
When Lightning in red,
With Action level "L04", DEF tank level is too low. Inducement
status is "Severe Inducement". Engine power is under heavy
deration.
With Action level "L03", DEF tank level is low. Inducement status is "Low level Inducement". Engine power is
under deration.
With No Action level display.DEF tank level is lower. Inducement status is "Continuous Warning". Need to add
DEF immediately to avoid advancing to the next Inducement status.
With No Action level display. Warning starts. Inducement status is "Warning". Need to add DEF immediately.
When Lightning in white
When fluctuation of DEF tank level is large, frozen, or not limited to, tank level sensing is not performed correct-
ly.
When DEF is added after engine starting switch turn to OFF.
When DEF tank level sensor is defective.
SEATBELT CAUTION LAMP
The seat belt caution lamp lights up when the seat belt is not
fastened.
Always fasten the seat belt while traveling because there may
be a possible danger.
DIRECTIONAL SWITCH CAUTION LAMP
The directional switch caution lamp warns the operator that
there is wrong operation of the directional selector switch or di-
rectional lever.
If the caution lamp lights up in red, return the directional selec-
tor switch and directional lever to NEUTRAL position (N).
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