Tire Repairs
Contents
1. Non Repairable Areas Tire Size Dimension A All LT Tires 2 1 2 8 25R 9 00R 10 00R 3 OR 10R 11R 3 165 IBRI25 of 285 295 305 315 75R 80R 85R 3 11 00R 12 00R e a 12R 13R FR20 3 1 2 12 80R 13 80R 14 80R 3 1 2 Figure 10 20 Figure 10 17 f a ee aar ri i iT LI yo SS O OO a ma l eF r Sidewall or Shoulder Repair Center Patch Over Injury Figure 10 24 CROWN REPAIR LIMITS Injuries up to 1 1 2 diameter may be repaired in line haul and city service radials depending on tire size Radial mileage tires used in city oad Repair i bus service only may be repaired up to Center Patch ma 1 diameter See authorized Goodyear Over Injury full service repair facility for other appropriate limits Figure 10 19 852. AND SHOULDER AREA Most sidewall injuries will be the split type caused by snags and punctures Maximum injury sizes for sidewall and shoulder repairs are shown below The number of these section repairs should be limited to 2 per tire for line haul service and 3 for city service with a maximum of 2 repairs per any 90 degree quadrant of the tire as long as repair patches do not overlap and the same ply wires are not affected by more than one injury Spot repairs may be made without limit providing that the body plies are not exposed or damaged Existing repairs must be reworked if loose or questionable ea z jian E 30 a ie AN etn ahd Repair epair Sh j oli w JEA Y Maximum Shoulder and Sidewall Repair Size Figure 10 12 Maximum Injury Size X Width Y Length Casing Size b 10 00R20 22 11 00R20 22 Nil oss Oe R225 285 75R24 5 295 75R22 5 16 5R22 5 1822 5 Figure 10 13 NOTE Wire must be sound and free of rust Maximum shoulder and sidewall injury for typical line haul medium truck tire is 1 wide circumferentially x 4 long radially See authorized Goodyear full service repair facility for other appropriate limits Center Patch Over Injury a mm TU T Repair Patch Should Be Centered Over Injury Figure 10 14 Figure 10 45 84 S EC T 1 ON T E N Tire Repairs APPLICATION OF CENTER OVER INJURY SECTION REPAIRS RADIAL PLy TIRES
3. Tire Repairs S E CTION T E N Tire Repairs High loads speeds and tire operating pressures place critical importance on tire maintenance practices lire repair is an integral part of maintaining radial tires to achieve the maximum in performance and value Because of this personnel should be adequately trained in repair procedures and techniques and only the highest quality repair materials should be used 80 SECTION T EN Tire Repairs Tire repairs normally made by fleet operators and tire service centers are limited to simple punctures such as nail holes Anything more extensive such as spot reinforcement or section repairs should be referred to an authorized full service Goodyear retreading and repair facility Significant cuts and cracks in the sidewall area should be spot repaired as soon as possible to prevent the need for a major section repair Frequent tire inspection in service is recommended This section gives information concerning tire damage extent and location to help determine whether or not section repairs are feasible Figure 10 1 Cutaway View of Unisteel Tire 8 The cutaway view of the Unisteel tire in Figure 10 1 shows the construction typical of Goodyear radial truck tires The single radial ply of steel cord as well as the four steel cord belt plies are evident Tire Repairs S E CTION T E N NAIL HOLE REPAIR PROCEDURES Radial tire nail hole repairs up to 3 8
4. aner the wire puller apply chemical vulcanizing cement to the leading 1 3 of the cured plug and pull through the injury from the inside of the tire 82 Tire Repairs Figure 10 8 Cut excess plug 1 16 above the liner surface on the inside Do not stretch plug Figure 10 9 If necessary repeat the liner cleaning procedure with pre buff cleaner Using a low speed grinder buff the liner to an RMA1 texture finish Then vacuum to remove dust and debris Figure 10 10 If using a chemical cure repair patch cement the back of the patch and the buffed liner with chemical vulcanizing cement If using a Versacure type repair patch cement the buffed liner only Thoroughly cover the cemented areas with a light even coat Allow proper drying time before applying the repair patch RADIAL ONLY Z Figure 10 14 Place beads in a relaxed position Center the patch over the plug and stitch the patch from the center out Directional arrows on the patch must be properly aligned after stitching is complete Apply a coat of butyl liner repair sealer to the patch edges and the over buffed liner Trim the excess plug no more than 1 8 above the outside tread surface 83 When using chemical cure MCX series patches use chemical vulcanizing solution on the buffed liner and back of repair patch for heat and non heat applications Tire Repairs SECTION RADIAL SECTION REPAIR LIMITS IN SIDEWALL
5. inch diameter 9 5 mm may be made in the tread face as long as the nail hole is at least one inch inside the shoulder All injuries outside this point should be treated as a section repair RADIAL ONLY Radial Only Repair Area Figure 10 2 Any number of repairs in the approved Figure 10 4 Beads in relaxed position Using a car Figure 10 6 Brush chemical cure cement on nozzle and crown area only tread minus outer 1 area bide cutter drill the injury from the inside to clean and insert into the hole while turning clockwise use outer grooves as a guide Refer larger injuries to prepare the injury for the plug a full service repair shop Do not overlap patches Aoi Les 7 a a a 1 hi z 7 Figure 10 3 Dismount tire Remove puncturing object Figure 10 5 Apply a coating of chemical cure cement Figure 10 7 Apply air pressure 80 psi to top of gun Using a probing awl determine the size and extent to the leading 1 3 of the cured plug Remove This presses the plug through the nozzle into and of injury and angle of penetration Thoroughly the end of the plug insertion tool and insert the plug through the injury Remove the gun while turning in a inspect the inside of the tire for additional damage into the nose piece Do not contaminate the plug or clockwise direction Clean area to be repaired inside of tire cross thread the nose piece If a pull through plug is used insert the plug into with scraper and pre buff cle
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