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DANGEROUS VOLTAGE LEVELS ARE PRESENT WHEN THE TRUCK IS RUNNING AND CONTINUE
TO EXIST AFTER SHUTDOWN IF THE REQUIRED SHUTDOWN PROCEDURES ARE NOT FOL-
LOWED.
Before attempting repairs or working near propulsion system components, the following precau-
tions and truck shutdown procedure must be followed:
•
DO NOT step on or use any power cable as a handhold when the engine is running.
•
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 "Truck Shutdown Procedures",
this Section, for additional propulsion system safety checks to be performed by a technician
trained to service the system.
•
ALL removal, repairs and installation of propulsion system electrical components, 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 technician should
inspect the truck and verify the propulsion system does not have dangerous voltage levels
present before repairs are started.
•
THE LINK VOLTAGE LIGHTS MUST NOT BE ILLUMINATED WHEN TEST OR REPAIRS ARE INI-
TIATED. It requires approximately 5 minutes after the truck is shut down before the Link Volt-
age has dissipated.
•
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 the Red warning lights on the Blower Control Panel have
turned off and it has been verified the system is de-energized.
•
BEFORE WELDING ON THE TRUCK; Disconnect all electrical harnesses and the ground wire
from the Engine Control System (ECS - MTU engine). If equipped with DDEC or Komatsu
engine, disconnect ECM harnesses. In the PSC and TCI enclosures, pull cards forward far
enough to disconnect the card connector from the backplane connector. Disconnect the bat-
tery charging alternator lead wire and open the battery disconnect switches. 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 exhaust air louvers. Avoid
laying welding cables across or near truck wiring harnesses or power cables; voltages can be
induced in adjacent cables, damaging electrical components.
E1-2
Index
E01012
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