TM 55-2210-224-12
4-29.
SWITCHES, CIRCUIT BREAKERS, AND INDICATING LIGHTS
This task covers:
a.
Test
b.
Removal
c.
Installation
INITIAL SETUP
Tools
Tool kit SC4940-97-CL-E16
TEST
WARNING
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.
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.
1.
Open electrical equipment cabinet door and set battery switch to OPEN.
2.
Tag and disconnect electrical leads from defective switches. Use multimeter and test switches for continuity in
all positions.
3.
Use a multimeter and check circuit breaker for continuity. Test circuit breaker in both ON and OFF positions.
REMOVAL
4.
Pushbutton switches.
a
Tag and disconnect electrical wires.
b
Remove nut (1) and lockwasher (2).
c
Remove pushbutton switch (3).
5.
Toggle switches.
a
Tag and disconnect electrical wires.
b
Remove nut (4) and switch (5).
4-74
