21
Installation, Maintenance, and Service Manual
Federal Signal
www.fedsig.com
Maintaining and Servicing the Allegiant
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 spots.
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 5 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 6). 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.
5.
Inspect the dome for cracks, crazing (hairline cracks), and other defects.
