SAFETY PRECAUTIONS CONCERNING MOUNTING,

OFF-THE-ROAD TIRES HANDBOOKSAFETY PRECAUTIONS CONCERNING MOUNTING, DEMOUNTING AND OPERATIONWARNINGTire and rim servicing can be dangerous, and should beperformed only by trained personnel using proper tools andprocedures. Failure to comply with these procedures mayresult in faulty positioning of the tire and/or rim, and cause theassembly to burst with explosive force, sufficient to cause seriousphysical injury or death.DEMOUNTING1. BEFORE DEMOUNTING Always exhaust all air from a single tire and from both tires ofa dual assembly prior to removing any wheel componentssuch as nuts and rim clamps. A broken rim part under pressure can blow apart and causeserious injury or death. Make sure to remove valve core to exhaust all air from thetire. Remove both cores from a dual assembly. (When youremove the wheel lugs, if the tire is still under pressure, theassembly may fly apart.) Check the valve stem by running a piece of wire through thestem to make sure it is not plugged. (Foreign material mayclog the valve stem during deflation or ice may form as the airleaves the tire, clogging the valve stem.)2. DURING DEMOUNTING Demounting tools apply pressure to rim flanges to unseattire beads, and keep your fingers clear. Always stand toone side and hold the tool with one hand when you applyhydraulic pressure. (If the tool slips off, it can fly with enoughforce to cause serious injury or death.) Do not use tools in the vicinity of the flange butt weld.3. AFTER DEMOUNTING Clean rims and repaint to stop detrimental effects ofcorrosion and facilitate checking and tire mounting. Be verycareful to clean all dirt and rust from the lock ring and gutter.This is important to secure the lock ring in its proper position.A filter on the air inflation equipment to remove the moisturefrom the air line helps prevent corrosion. The filter should bechecked periodically to see that it is working properly. (Partsmust be clean for a proper fit - particularly the gutter sectionwhich holds the lock ring in its proper position.)MOUNTING1. BEFORE MOUNTING Check rim components for cracks. Replace all cracked,badly worn, damaged and severely rusted component withnew parts of the same size and type. When a componentsis in doubt, replace it. (Parts that are cracked, damaged orexcessively corroded are weakened. Bent or repaired partsmay not engage properly.) Do not, under any circumstance, attempt to rework, weld,heat or braze any rim component that is cracked, brokenor damaged. Replace with a new part that is not cracked,broken or damaged and which is of the same size and type.(Heating may weaken a part to extent that it is unable towithstand forces of inflation or operation.) Check type of rim and make sure all parts of such rim arebeing assembled properly. Follow instruction manual of rimor ask your distributor if you have any doubts.(Mismatchedparts may appear to fit, but when the tire is inflated they mayfly apart with explosive force.) Mixing parts of one type rim with those of another ispotentially dangerous. Always check rim with manufacturerfor approval. Remove rust, dirt and other foreign matter from the rimsurface, particularly on the bead seats and O-ring slot. Clean the inside of the tire. Make sure tube and flap are correct and not damaged fortube type tires. Always prepare a new O-ring for tubeless tires. Do not reinflate a tire that has been run flat or has been runat 80% or less of its recommended operating pressure, orwhen there is obvious or suspected damage to the tire orwheel components. (Components may have been damagedor dislocated during the time the tire was run flat or seriouslyunder-inflated.)2. DURING MOUNTING AND INFLATION Do not try to seat rings or other components by hammeringwhile tire is inflated or partially inflated. Double check to make sure all components are properlyseated prior to inflation. Do not inflate tire before all components are properlyin place. Place in safety cage or use a restraining deviceand inflate to approximately 0.35 kg/ cm2 (5 psi), recheckcomponents for proper assembly. Observe that O-ringdoes not roll out of its groove. If assembly is not performedproperly, deflate and correct. Never hammer or an inflatedon partially inflated tire/rim assembly. If assembly is correctat approximately 0.35 kg/cm2 (5 psi), continue to inflate fullyto seat the tire beads. Never sit or stand in front of a tire and rim assembly that isbeing inflated. Always use a clip-on chuck with a sufficientlength of hose to permit the person inflating the tire to standclear of the potential trajectory of the wheel components,and use an in-line valve with gauge or a pressure regulatorpreset to a desired value when inflating a tire. When a tire isin a restraining device, do not lean any part of your body orequipment on or against the restraining device. (If parts areimproperly installed they may fly apart with explosive force.) Never attempt to weld on an inflated tire/rim assembly or ona rim assembly with a deflated tire. (Heat from welding willcause a sudden, drastic increase in pressure, resulting in anexplosion with the force of a bomb. Deflated tires can catchfire inside the air chamber.)3. AFTER INFLATION Make sure no air leakage can be suspected, especially intubeless tires.OPERATION Do not use under-inflated tires. Do not bleed or reduce air pressure to compensate for theincrease in pressure resulting from operation. Do not use under-size rims. Use recommended rim for thetire. Do not overload or over-inflate tire/rim assemblies. Checkfor adequate rim strength if special operating conditions arerequired. (Excessive overload can cause damage to the tireand rim assembly.) Never run a vehicle on one tire of a dual assembly. (Thecarrying capacity of the single tire and rim is dangerouslyexceeded, and operating a vehicle in this manner can resultin damage to the rim and tire or cause a tire fire.) Never use a tube in a tubeless tire/rim assembly where therim is suspected of air leakage. (Loss of air pressure throughfatigue cracks or other fractures in a tubeless rim warnsyou of a potential rim failure. This safety feature is lost whentubes are used with leaking rims. Continued use may causethe rim to burst with explosive force.) Always inspect rims and wheels for damage during tirechecks. (Early detection of potential rim failure may preventserous injury.) Never add or remove an attachment or otherwise modify arim (Especially by heating, welding or brazing) unless the tirehas been removed and approval has been received from therim manufacturer. (Modification or heating of a rim or oneof its parts may weaken it so that it cannot withstand forcescreated by inflation or operation.) Never mount bias tire and radial tire on the same axle. Followvehicle manufacturer’s recommendation. Never use tire under unintended service conditions for thetire. Please consult YOKOHAMA if vehicle operation requiresspecialized tire fitment.GET YOUR JOB DONE ANYWHERE IN THE WORLDSpecifications subject to change without notice.08, 2017Made in Japan. 2017 by THE YOKOHAMA RUBBER CO., LTD.CE226HB-TP01

Table of Contents1Outline of OFF-THE-ROAD TIRES3Tire MaintenanceTRA Classification of OFF-THE-ROAD TIRES .2Inflation Pressure . 48Tread Pattern .2Load .49Tread Thickness .3Speed .49Construction of OFF-THE-ROAD TIRES .3Proper Matching of Dual-Tires .50Tire Marking(Radial).4Road Surface Maintenance . 51Size Identification and Aspect Ratio .4Tire Problems and Major Causes . 51Tire Specification Code .5Instructions for Operations .52Tires by Type of Vehicle.6Tire Appearance Check-up .52Load Index .8Measuring Tread Wear .53Speed Symbol .9Ton-Kilometer-Per-HourConversion Table: Star Mark to Ply Rating .9(Ton-Mile-Per-Hour) . 54Load-and-Carry Operation of2YOKOHAMA OFF-THE-ROAD TIRESRadial : ApplicationFront-End Loaders.56Protecting Tires on Vehicle inEarthmover .10Highway Drive-Away.57Loader & Dozer . 11Handling of Tires . 60Grader . 12Safety Precautions for Demounting . 60Mobile Crane . 12Safety Precautions for Mounting . 61Industrial . 12Safety Precautions for Operation .62Radial : Technical DataTRA Code : E,L,G . 14Tire Storage .63How to Reduce Tire Costs .63Application : Mobile Crane .18TRA Code : IND.18Appendix(Radial) .20Bias : Application4Rims, Valves & O-ringsTubes and Flaps . 64Rims. 64Earthmover .22Valves .66Loader & Dozer .23O-rings .70Grader .26Combination Tables .72Compactor .26Industrial .27Bias : Technical Data5Miscellaneous DataEarthmover Data . 74TRA Code : E,L,G .28Conversion Tables .77TRA Code : C . 42Approximate Weight of Materials.79TRA Code : IND. 42Appendix(Bias) . 461

1Outline of OFF-THE-ROAD TIRESOutline of OFF-THE-ROAD TIRESTRA Classification of OFF-THE-ROAD TIRESTread ThicknessYOKOHAMA OFF-THE-ROAD TIRES are classified as follows by the Tire and Rim Association ctorMobile CraneIndustrialTRA CodeTread TypeE-2Traction RegularE-3Rock RegularE-4Rock DeepE-7FlotationG-2Traction RegularG-3Rock RegularL-2Traction RegularL-3Rock RegularL-4Rock DeepL-5Rock Extra DeepL-4SSmooth DeepL-5SSmooth Extra DeepC-1SmoothC-2Grooved-VehiclesAlthough thicker treads give greater wear and cutresistance, they also generate and retain more heat.Accordingly, work conditions for thick tread tiresshould be thoroughly evaluated to prevent heatseparation and other heat related damage. Deep andextra deep tread tires have almost the same overalldiameter which is larger than regular tread tires.When replacing regular tread tires with deep or extradeep tread tires, the larger overall diameters of thethicker tread tires should be taken into ction of OFF-THE-ROAD TIRESStructural Diagram ofOFF-THE-ROAD RADIAL TIRESStructural Diagram ofOFF-THE-ROAD BIAS TIRES Belt Breaker Carcass Tread Inner Liner Sidewall Bead Wire Carcass Chafer Bead Sidewall Inner-IND-3Traction RegularIND-4DeepIND-5Extra Deep TreadTread PatternThe tread pattern is designed to produce varying degrees of traction, cut resistance, flotation, wearand heat resistance. Selection of the proper OFF-THE-ROAD TIRES depends on the job andthe conditions.For example, different tread patterns are used to produce maximum traction or flotation on sand,mud and rock. There are five basic tread patterns: rock, traction, block, rib and smooth.2According to the Tire and Rim Association (TRA),there are three general classifications for treadthickness for OFF-THE-ROAD TIRES : regular, deep andextra deep. Deep and extra deep are 1.5 and 2.5 timesthicker than regular, respectively. The thicker treadshave greater cut and wear resistance.E-2/E-3G-2/G-3L-2/L-3IND-3Caution: Never replace a tire mounted on a vehicle with any tire designed for a different type of vehicle.For example, you should never place an earthmover tire on a loader.Rock Pattern1Traction PatternBlock PatternRib PatternSteel Breakers(Bias Tires)SmoothThe steel breaker tire has steel cord breakers that giveit very high cut resistance. It is specially useful wheresharp rock is a problem, and is applicable to loader,dozer, dump truck and occasionally earthmover typetires. The adhesiveness between the steel cord andrubber is, however, more susceptible to heat damagethan that of nylon cord and rubber. Accordingly, steelbreaker tires should not be subjected to conditionswhere heat generation is great. Because of thedifficulty involved in retreading steel breaker tires,they should not be used for jobs where more easilyretreaded tires can be used.Steel Breaker DiagramSteel Breaker3