Issue link: http://read.dmtmag.com/i/34501
BEAD DAMAGE Bead turning, cracking/splitting, unwrapping. • Heavy brake heat generating operations • Mechanical brake system out of specification • Incorrect wheel width • Excessive flex from overload/underinflation • Mounting/Demounting (insufficient lubrication, improper tool use, aggravated by heat (beads become brittle)) EFFECT: Heating and Deformation of the Bead Rubber CAUSE: Excessive Heat EFFECT: Bead Turning, Cracking/Splitting, Unwrapping From Heat CAUSE: Excessive Heat EFFECT: Bead Tearing From Mounting/Demounting CAUSE: Insufficient Lubrication, Improper Tools EFFECT: Bead Turning, Cracking/Splitting, Unwrapping From Heat CAUSE: Excessive Heat Tire inspection should always include a thorough inspection of both sidewalls and inner liner, as this may reveal any potential damage condition that would cause the tire to become scrap. Inner liner examination for creases, wrinkling, discoloration, or insufficient repairs, and exterior examination for signs of bumps or undulations, as well as broken cords, could be potential out of service causes. Proper OSHA (Occupational Safety and Health Administration) regulations must be followed when putting any tire/rim back in service. After the tire has been inflated to 20 psi in a safety cage, it should undergo another sidewall inspection for distortions, undulations, or popping noise indicating a breaking of the steel cords. If this is the case, immediately deflate the tire and scrap. If no damage is detected, continue to inflate to the maximum air pressure marked on the sidewall. Inspect the sidewall from a distance looking for distortions and/or undulations, and listen for a popping noise. If none exist, then insert valve core and return tire to service after adjusting the pressure. Section Eight: Tire Damage 109