Shutdown Procedure; Delayed Engine Shutdown Procedure - Komatsu 730E Operation & Maintenance Manual

OM3035.1 02/03
Operating Instructions
The following procedure (1. - 4.) should be followed at each engine shutdown.
1. Stop truck. Reduce engine RPM to low idle. Place Selector Switch in "Neutral" and apply Parking Brake
switch.If the Engine Shutdown with Timer Delay is preferred, refer to the DELAYED ENGINE SHUTDOWN
PROCEDURE below.
2. Allow engine to cool gradually by running at low idle for 3 to 5 minutes.
3. With truck stopped and engine cooled down, turn keyswitch counterclockwise to "Off" for normal shutdown of
engines. If engine does not shutdown with keyswitch, use Engine Shutdown Switch on center console (see
"Operator Controls" section) and hold this switch down until engine stops.
4. With keyswitch "Off", and engine stopped, wait at least 90 seconds. Insure steering circuit is completely bled
down by turning steering wheel back and forth several times. No front wheel movement will occur when
hydraulic pressure is relieved.
5. Close and lock all windows, remove key from keyswitch and lock cab to prevent possible unauthorized truck
operation. Dismount truck properly.

DELAYED ENGINE SHUTDOWN PROCEDURE

1. Stop the truck out of the way of other traffic on a level surface and free of overhead power
lines or other obstructions (in case dump body should need to be raised).
a. Reduce engine speed to low idle.
b. Place the directional Selector Switch (2, Figure 3-4) in "Neutral".
c. Apply the Parking Brake switch (13, Figure 3-6). Be sure the "Parking Brake Applied"
indicator light in the overhead display panel (A3, Figure 3-7) is illuminated.
2. Refer to "Instrument Panel And Indicator Lights" Section for the location on the instrument
panel of Engine Shutdown Switch with 5 Minute Idle Timer Delay (2, Figure 3-6). This
is a 3-position rocker-type switch (Off-On-Momentary).
a. Press top of switch to the "On" (center position), then press firmly to the "Momentary"
(upper position) and hold this position briefly to activate the 5 Minute Idle Timer (switch
is spring-loaded to return to "On" position when released).
b. When the Engine Shutdown Timer has been activated, the Timer Delay indicator light
in the overhead display panel (C4, Figure 3-7) will illuminate to indicate that the shut-
down timing sequence has been started. The engine will continue to run at Idle RPM
for approximately 5 minutes to allow for proper engine cool-down before stopping.
c. The Engine Shutdown Timer switch DOES NOT turn off 24 VDC electric power. Turn
Keyswitch counterclockwide to the "Off" position to cause the engine to shutdown when timing sequence is
complete. When the engine stops after the 5 minute idle period, the hydraulic bleeddown timer will be acti-
vated and turn off the 24 VDC electric circuits controlled by the keyswitch.
NOTE : To cancel the 5 Minute Idle Timer sequence, press Timer Delay Shutdown switch to the "Off"
(lower) position.
•If keyswitch is in "Off" position, engine will stop.
•If keyswitch is in "On" position, engine will continue to run.
If engine does not shutdown with keyswitch, use Engine Shutdown Switch (8, Figure 3-4) on operator cab
center console, and hold this switch down until engine stops. The Ground Level Shutdown Switch will also
stop the engine during this time-out.
3. After engine has stopped, perform steps 4 and 5, as described in "ENGINE SHUTDOWN PROCEDURE"
above.
ENGINE SHUTDOWN PROCEDURE
Engine WILL NOT SHUT DOWN, if keyswitch is not
turned to the "Off" position.
Operation - Section 3
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