3-24. POWER CONTACTOR
This task covers:
Tool kit SC4940-97-CL-E12
Drycleaning solvent (Item 34, Appendix B)
Electrical insulating varnish
(Item 37, Appendix B)
Variable dc voltage supply
High voltage is used in the operation of equipment.
Do not be misled by the term LOW VOLTAGE.
Potentials as low as 50 volts may cause death.
Remove rings, bracelets, wristwatches, and neck
chains before working around the locomotive.
Jewelry can catch on equipment and cause injury, or
may short across an electrical circuit and cause
severe burns or electrical shock.
Two of the motor line contactor have interlocks,
the other two do not. Except for the interlocks,
the maintenance procedures are the same.
Open electrical equipment cabinet door and set
battery switch to OPEN. Make sure electrical wires
are labeled with wire numbers or polarity signs. Tag
and disconnect wires from power contactor assembly
Remove two capscrews (1), flat washers (2), and
power contactor assembly (3).