Truck Shutdown Procedure - Komatsu 930E-2 Shop Manual

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NEVER open any electrical cabinet covers or touch the Retarding Grid elements.
Additional procedures are required before it is safe to do so. Refer to Section
"E" for additional propulsion system safety checks to be performed by a techni-
cian trained to service the system.
•
ALL removal, repairs and installation of propulsion system electrical compo-
nents, cables etc. must be performed by an electrical maintenance technician
properly trained to service the system.
•
IN THE EVENT OF A PROPULSION SYSTEM MALFUNCTION, a qualified techni-
cian should inspect the truck and verify the propulsion system does not have
dangerous voltage levels present before repairs are started.
•
PRIOR TO WELDING ON THE TRUCK, maintenance personnel should attempt to
notify the Komatsu Factory Representative. The welding ground electrode
should be attached as close as possible to the area to be welded.
NEVER weld on the rear of the Electrical Control Cabinet or the retard grid ex-
haust air louvers.
After the truck is parked in position for the repairs, the truck must be shut down properly to ensure
the safety of those working in the areas of the deck, electrical cabinet, traction motors, and retarding
grids. The following procedures will ensure the electrical system is properly discharged before repairs
are started.
1. Reduce the engine speed to idle. Place the selector switch in NEUTRAL and apply the parking
brake. Be certain the "Parking Brake Applied" indicator lamp in the overhead panel is illumi-
nated.
2. Place the drive system in the REST mode by turning the Rest switch on the instrument panel
ON. Be certain the REST warning lamp is illuminated.
3. Shut down the engine using the keyswitch. If, for some reason the engine does not shut down,
use the shutdown switch on the center console.
4. After approximately 90 seconds, verify the steering accumulators have bled down by attempt-
ing to steer.
5. Verify the LINK VOLTAGE lights on the electrical cabinet and the DID panel in the cab are OFF.
If they remain on longer than 5 minutes after shutdown, the propulsion system must be in-
spected by a technician trained to investigate the cause.
6. Place the GF Cutout Switch, located in the Information Display Panel at the left side of the Elec-
trical Control Cabinet in the CUTOUT position.
AN ADDITIONAL 10 TO 15 MINUTES IS REQUIRED FOR THE AUXILIARY BLOWER MOTOR AND
ITS CIRCUITS TO DE-ENERGIZE.
Do not attempt to perform Auxiliary Blower Motor or Blower electrical circuit repairs until it
has been verified the system is de-energized.
D1-2

TRUCK SHUTDOWN PROCEDURE

Index D01033