Komatsu D51EX-24, Operation & Maintenance Manual

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11. Since fan reverse rotation is set, start the engine.
After the engine is started, the fan rotates in reverse, and
the machine monitor screen displays as shown in the fig-
ure.
If the aftertreatment devices regeneration display (A) dis-
plays that the regeneration is in operation while the fan is
rotated in reverse, the engine speed may decrease to
1100 rpm, regardless of the position of the fuel control dial.
In this case, the fan speed decreases and sufficient air
flow for cleaning the radiator cannot be obtained. Accord-
ingly, wait under the current condition until aftertreatment
devices regeneration display (A) goes out.
After the lamp goes out, the fan can rotate in reverse by in-
creasing the engine speed.
If the parking brake lever or work equipment lock lever is
set to FREE position while the fan is rotated in reverse, the
screen shown in the figure is displayed.
In this case, stop the fan reverse rotation by returning the
parking brake lock lever and work equipment lock lever to
LOCK positions or by pressing switch F5.
If fan rotates in reverse with high speed for 10 minutes or
more, engine speed lowers automatically in order to pro-
tect the hydraulic component, and the screen shown in the
figure may be displayed, but this is not a failure.
EXPLANATION OF COMPONENTS OPERATION
3-64