Komatsu PC138US-11 Operation & Maintenance Manual page 238

MACHINE OPERATIONS AND CONTROLS
NOTICE
Do not stop the engine abruptly except in an emergency.
Otherwise, the service lives of component parts of the en-
gine will be reduced.
If the engine is overheated, do not try to stop it abruptly
but run it at medium speed to allow it to cool down gradu-
ally, and then stop it.
If the engine is stopped during the aftertreatment devices
regeneration, the components may be damaged.
When stopping the engine, stop the aftertreatment devices
regeneration first according to "PROCEDURE FOR SET-
TING AFTERTREATMENT DEVICES-REGENERATION DISA-
BLE (3-116)", then stop the engine after running it at low
idle for approximately 5 minutes. Then stop the engine.
Stop the engine according to the following procedure.
1.
Run the engine at low idle for approximately 5 minutes to cool it down gradually.
2.
Turn the key in starting switch (1) to OFF position (A).
The engine will stop.
3.
Remove the key from starting switch (1).
When you stop the engine, the regeneration disable setting is canceled. If necessary, disable the regenera-
tion again after you start the engine.
REMARK
• When the key in starting switch (1) is turned to OFF
position (A), the engine stops but the power supply to
the machine 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.
• If the starting switch (1) key is turned to OFF position
(A) while the engine is still hot, guidance (2) may be
displayed on the machine monitor. To cool down the
engine before stopping, run it at low idle for approxi-
mately 5 minutes, because it may cause damage to
the devices.
• 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.
The devices continue operation for several minutes for
this reason after the engine starting key is turned to
OFF position, but this is not abnormal.
Do not turn the battery disconnect switch OFF, while
the devices are operating to return DEF. After finishing
the drawing operation, the devices stop automatically.
3-168
WENAM00111
OPERATION