Komatsu D37EX-24 Operation & Maintenance Manual page 217

OPERATION
2.
Turn the fuel control dial (1) to Low idle (MIN) position.
3.
Run the engine at low idle for approximately 5 minutes to
cool down gradually.
4.
Turn the key in starting switch (2) to OFF position (A).
The engine will stop.
5.
Remove the key from the starting switch (2).
When you stop the engine, the regeneration disable set-
ting is canceled. If necessary, disable the regeneration
again after you start the engine.
REMARK
• When the key in starting switch (2) is turned to OFF
position, the engine stops, but the machine's main
power supply is not turned off immediately.
During this period, the power is supplied to the con-
troller to save the operating condition and then finish
the system. The time to keep supplying the power de-
pends on the operating condition.
• Also when the cooling fan is turned in reverse, the ma-
chine's main power supply is not turned off immediate-
ly, even if the key in engine starting switch (2) is
turned to OFF position.
This is for protection of the hydraulic circuit, and the
power is kept supplied for 7 seconds.
• If the starting switch (2) key is turned to OFF position
(A) while the engine is still hot, guidance (3) may be
displayed on the machine monitor. This may cause
damage to the devices. To cool down the engine be-
fore stopping, run it at low idle from the next time and
after.
• After the engine is stopped, DEF in DEF injector and
pump is automatically purged and returned to the tank
to prevent malfunction of the devices caused by freez-
ing of DEF or deposition of urea.
For this purpose, the devices keep operating for sev-
eral minutes after the key in starting switch (2) is
turned to OFF position, and this does not indicate ab-
normality.
In addition, the system operating lamp lights up while
devices are operating to purge the DEF to the tank.
Do not turn the battery disconnect switch to OFF posi-
tion while the system operating lamp is lit. After DEF
has been purged completely, the devices stop auto-
matically.
MACHINE OPERATIONS AND CONTROLS
3-159