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Special Precautions for Working on a 930E Truck
Preliminary Procedures before Welding or
Performing Maintenance
Prior to welding and/or repairing the Truck, mainte-
nance personnel should attempt to notify the Komatsu
factory representative. Only qualified personnel, spe-
cifically trained for servicing the AC Drive System,
should perform this service.
If it is necessary to perform welding or repair to the
truck without the field engineer present, the following
procedures should be followed to ensure that the truck
is safe for maintenance personnel to work on and to
reduce the chance for damage to equipment.
Anytime the 930E engine is running:
• • • • Do not open any of the cabinet doors or re-
move any covers.
• • • • Do not use any of the power cables for hand
holds or foot steps.
• • • • Do not touch the retarder grid elements.
Before opening any cabinets or touching a grid
element or a power cable, the engine must be
shutdown.
Normal Engine Shutdown Procedure
1. Stop the truck out of the way of other traffic on a
level surface (dry, if possible) and free of over-
head power lines or other obstructions (in case
dump body should need to be raised).
a. Reduce engine speed to idle.
Allow engine to cool gradually by running at low
idle for 3 to 5 minutes.
b. Place the directional Selector Switch in "Neu-
tral".
c. Apply the Parking Brake switch.
Be sure the "Parking Brake Applied" indicator
light in the overhead display panel is illumi-
nated.
A3-18
Engine Shutdown Procedure before Welding or
Performing Maintenance
Normal operation of the drive system at shutdown
should leave the system safe to maintain. However, in
the event of a system failure, performing the following
procedure prior to any maintenance activities will en-
sure that no hazardous voltages are present in the AC
Drive System.
General Safety and Operating Instructions
2. Place REST switch in "On" position to put AC
Drive System in "REST" mode of operation. Be
sure the "REST" indicator light in the overhead
panel is illuminated.
3. With engine cooled down, turn keyswitch counter-
clockwise to "Off" position for normal shutdown
of engine.
If engine does not shutdown with keyswitch, use
Engine Shutdown Switch on operator cab center
console, and hold this switch down until engine
stops.
4. With keyswitch "Off", and engine stopped, wait at
least 90 seconds. Insure steering circuit is com-
pletely bled down by turning steering wheel back
and forth several times. No front wheel movement
will occur when hydraulic pressure is relieved.
If the vehicle continues to steer after shutdown,
notify maintenance personnel.
5. Verify that all the LINK VOLTAGE lights are OFF
(one on back wall of operator cab, and two on
deck control cabinets), and notify maintenance
personnel, if any light remains illuminated longer
than five minutes after engine shutdown.
6. Close and lock all windows, remove key from
keyswitch and lock cab to prevent possible un-
authorized truck operation. Dismount truck prop-
erly. Put wheel chocks in place.
1. Before shutting down the engine, verify the status
of all the drive system warning lights on the
overhead display panel. Use the Lamp Test
Switch to verify that all lamps are functioning
properly.
If any of the RED Drive System warning lights
remain ON, do not attempt to open any cabinets,
disconnect any cables, or reach inside the re-
tarder grid cabinet without a trained drive system
technician present - even if engine is shut down.
Only qualified personnel, specifically trained
A03017
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