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Allegiant Light Bar
Federal Signal
www.fedsig.com
Maintaining and Servicing the Allegiant
EQUIPMENT DAMAGE: Do not use a pressure washer to clean the light bar.
Failure to heed this notice will damage the light bar.
To clean the light bar lens or dome:
1. Rinse with lukewarm water to loosen dirt and debris.
2. Use a mild detergent, lukewarm water, and a soft cloth to gently clean the lens.
To avoid damaging the finish, do not use heavy pressure or caustic, abrasive, or
petroleum-based cleaners.
3. Rinse and dry with a soft cloth to prevent water spotting.
4. To remove fine scratches and haze, use a soft cloth and a high quality automotive
paste cleaner/wax that is non-abrasive.
Removing and Reinstalling the Light Bar Dome
The dome covers the ROC (Reliable Onboard Circuitry) PCBs and controller PCB.
Tool required:
• T27 Torx driver
Removing the Lens
Figure 8 Four barrel nuts in passenger-side end dome
290A5984
To remove the lens:
1. Disconnect all power to the light bar at the battery.
2. Use a T27 Torx driver to remove the 1/4"-20 Torx-head barrel nuts securing the
dome (Figure 8). Carefully remove the dome. Avoid damaging the lip seal.
3. Verify that an O-ring is under the head of each barrel nut and not stuck to the
dome. Use a wooden or plastic pick to carefully remove the O-rings from the
dome to prevent damaging them.
4. Inspect the O-rings and the lip seal for deformation, brittleness, cuts, or tears. To
maintain water tightness, replace a questionable O-ring or seal.
