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ALARM BELL, MAIN DECK EXTERIOR, REPLACEMENT
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TM-55-1925-292-14-P Firefighting Fire Alarm and Fire Suppression Systems Inland and Coastal Large TUG (LT) Manual
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Figure 5. Pressure Operated Switch
TM 55-1925-292-14&P
0032 00
4. Remove the bell actuator assembly cover (figure 4, item 4), and turn it over to reveal the internal electrical
components (figure 4, item 6).
WARNING
Replace or repair components only after the affected circuit has been secured,
locked out and tagged out (FM 55-502). Performing replacement with the circuit
energized may result in injury.
5. Using a multimeter, check for voltage at the terminals (figure 4, item 7) to ensure that electrical circuits are
deenergized. If voltage is present, ensure that the proper circuit breakers are set to OFF, locked out, and
tagged out (FM 55-502). If no voltage is present, proceed with the procedure.
6. Label and remove the wiring from the terminals (figure 4, item 7), and remove the cover (figure 4, item 4).
7. Loosen and remove the four bolts (figure 4, item 8) and lockwashers (figure 4, item 9) that secure the
actuator assembly, and remove it from the mounting bracket. Discard the lockwashers.
INSTALLATION
1. Align the actuator assembly to the mounting bracket, and secure it in place with the four bolts (figure 4, item 8)
and four new lockwashers (figure 4, item 9).
2. Connect the wiring to the terminals (figure 4, item 7) using the labels from step 6 of Removal as a guide.
Remove the labels.
3. Install the bell actuator assembly cover (figure 4, item 4) and secure it in place with the six screws (figure 4,
item 5).
5. Install the gong (figure 4, item 3) on the bell actuator assembly cover (figure 4, item 4), and secure it with the
bolt (figure 4, item 1) and washer (figure 4, item 2).
6. Perform the Follow-On Service procedure at the end of this work package.
PRESSURE OPERATED SWITCH REPLACEMENT
REMOVAL
1. Remove the eight screws (figure 5, item 1) from the cover (figure 5, item 2) of the pressure operated switch
(figure 5, item 3).
0032 00-7

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