VALVES THAT LET THE AIR OUT (SCRAPER BRAKES)

CORRECT POSITION FOR TIRE INFLATION (Behind the Tread) - TM-5-3805-260-24_223

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 TOO MUCH HEAT CAN CAUSE A TIRE TO HAVE AN EXPLOSION (SUDDEN BREAK) WARNING Explosions of pneumatic tires have resulted from heat-causing gas combustion inside the tires. The heat, caused by welding or heating rim components, fire, or too much use of brakes, can cause gas combustion. A tire explosion is much more violent than a blowout. The explosion can throw the tire, rim and final drive components as far as 460 m (1500 ft.) or more from the machine. Both the force of the explosion and the debris can cause personal injury or death, and property damage. Although an explosion is not probable, the hazard (danger) is very great, especially with large tires used on wheel tractor-scrapers. All personnel must know of this danger and the actions to take to keep the risk at a minimum. Heat from any source can be sent to the tire. This causes deterioration (decrease in quality) of the bead. Normally, the burned bead causes loss of air, and the tire goes flat without danger to anyone in the area. A bead that is burnt can result in the release of an explosive mixture of gas inside the tire. It is possible for the mixture of gas inside the tire to burn. The fire inside the tire causes a rapid increase in pressure. The result is a violent tire explosion. The explosion causes a blowout at the tire bead which throws the tire, rim assembly and final drive components far away from the machine. When a wheel is in rotation, the movement of air around the tire helps in cooling the tire. There is more danger of a tire explosion after the machine stops, because of the loss of this cooling effect. If smoke, too much heat, the smell of burning rubber or hot brakes, or other indications of bead burning are noticed, take action to prevent personal injury. Move the machine to a remote area, but only if it can be done without danger to the operator or other personnel in the area. Remove all personnel in the area of the machine. WARNING APPROACH AREAS. Do not get within 460 m (1500 ft.) from the side or within 15 m (50 ft.) from the front, rear or above a tire. Do not go near any tire on the machine if there is a brake fire, burning rubber or other indications that the brakes have caused too much heat. This heat can have an effect on all other tires on the machine, even though the visual indication is only at one tire. If there is an indication of a brake fire or the smell of burning rubber, do not go near the machine. FIGHT (put out) THESE FIRES FROM A REMOTE LOCATION. (Many times, the immediate action to a fire caused by tires or brakes, is for people to use a hand fire extinguisher and run up close to the machine to help put out the fire.) Keep away from the machine until the tires cool (temperature decreases). Permit at least eight hours for the tires to cool before a person goes near the machine. Keep personnel out of the area, and at least 460 m (1500 ft.) away from the side of the tire and 15 m (50 ft.) away from the front or rear of the machine. A small fire caused by debris on the machine is not a hazard. This type of fire can be put out with a hand fire extinguisher. A burning (smoking) tire or fire in the brake area is hazardous. These are sure indications of a hot tire. There is no completely safe way to get near a machine to put out this type of hazardous fire. Go near only at the front or rear of a machine and use a large bulldozer as a shield. 2-155

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