Komatsu 830E-AC Shop Manual page 213

24 VDC ELECTRICAL SYSTEM COMPONENTS
Do not attempt repairs until the truck is properly
shut down. Dangerous voltage levels are present
in the propulsion system while the engine is run-
ning and for a period of time after shutdown.
Refer to the Index in Section D for additional
warnings.
TRUCK SHUTDOWN PROCEDURE
1. Reduce the engine speed to idle. Move the
directional control lever in PARK. Make sure
that the parking brake applied indicator light in
the overhead panel is illuminated.
2. Place the drive system in the rest mode by turn-
ing the rest switch on the instrument panel ON.
Ensure that the rest mode indicator light is illu-
minated.
3. Stop the engine using the key switch. If, for
some reason the engine does not stop, use the
stop switch on the center console.
4. Verify the link voltage lights on the electrical
cabinet and next to the DID panel in the cab are
OFF. If they remain on longer than 5 minutes
after shutdown, the propulsion system must be
inspected by a technician trained to investigate
the cause.
5. Place the GF cutout switch in the CUTOUT
position throughout test and troubleshooting
procedures.
6. Verify that the steering accumulators have bled
down by attempting to turn the steering wheel.
BRAKE WARNING BUZZER
The brake warning buzzer provides an audible alarm
for the operator if a malfunction occurs in the hydrau-
lic service brake system. This buzzer is located
inside the radio module in the overhead panel. Refer
to Section J for additional details.
D03036 10/06
AUXILIARY CONTROL CABINET COMPO-
NENTS
The following 24VDC electrical system components
are located in the auxiliary control cabinet, which is
mounted on the left side of the main control cabinet
behind the cab. The auxiliary control cabinet houses
various components for the 24VDC circuits, engine
related devices, and terminal strips that connect
truck wiring harnesses with the main control cabinet
and cab.
The following information describes the components
in the auxiliary control cabinet and their operation.
Additional detailed information for operation and trou-
bleshooting procedures not included below can be
found in Section E, Electrical Propulsion System, the
engine manufacturer's service publications, and the
appropriate GE publications. The electrical schemat-
ics in Section R should be used when troubleshoot-
ing problems with the following 24VDC electrical
system components.
Power Distribution Terminals
24VDC terminal (1, Figure 3-1) and 12VDC terminal
(2) are mounted on the left wall of the cabinet. These
terminals distribute battery voltage and 12VDC for
devices requiring reduced voltage. The 24VDC termi-
nal is a convenient test point for measuring battery
voltage during troubleshooting procedures.
Engine Starter Failure Delay Timer
Engine starter failure delay timer (3) is used in the
circuitry which detects a failure of one of the two
starter motors. This circuit provides a warning to the
operator if either starter does not energize for at least
2 seconds when engine starting is first attempted, or
if either starter stops operating during the engine
starting process.
24VDC Electrical System Components D3-3