SAFETY PRECAUTIONS CONCERNING MOUNTING, DEMOUNTING AND OPERATION OFF-THE-ROAD TIRES HANDBOOK WARNING at 80% or less of its recommended operating pressure, or when there is obvious or suspected damage to the tire or Tire and rim servicing can be dangerous, and should be wheel components. (Components may have been damaged performed only by trained personnel using proper tools and or dislocated during the time the tire was run fl at or seriously procedures. Failure to comply with these procedures may under-infl ated.) result in faulty positioning of the tire and/or rim, and cause the assembly to burst with explosive force, suffi cient to cause serious 2. DURING MOUNTING AND INFLATION physical injury or death. • Do not try to seat rings or other components by hammering while tire is infl ated or partially infl ated. DEMOUNTING • Double check to make sure all components are properly 1. BEFORE DEMOUNTING seated prior to infl ation. • Do not infl ate tire before all components are properly • Always exhaust all air from a single tire and from both tires of in place. Place in safety cage or use a restraining device a dual assembly prior to removing any wheel components and infl ate to approximately 0.35 kg/ cm2 (5 psi), recheck such as nuts and rim clamps. components for proper assembly. Observe that O-ring • A broken rim part under pressure can blow apart and cause does not roll out of its groove. If assembly is not performed serious injury or death. properly, defl ate and correct. Never hammer or an infl ated • Make sure to remove valve core to exhaust all air from the on partially infl ated tire/rim assembly. If assembly is correct tire. Remove both cores from a dual assembly. (When you at approximately 0.35 kg/cm2 (5 psi), continue to infl ate fully remove the wheel lugs, if the tire is still under pressure, the to seat the tire beads. assembly may fl y apart.) • Never sit or stand in front of a tire and rim assembly that is • Check the valve stem by running a piece of wire through the being infl ated. Always use a clip-on chuck with a suffi cient stem to make sure it is not plugged. (Foreign material may length of hose to permit the person infl ating the tire to stand clog the valve stem during defl ation or ice may form as the air clear of the potential trajectory of the wheel components, leaves the tire, clogging the valve stem.) and use an in-line valve with gauge or a pressure regulator 2. DURING DEMOUNTING preset to a desired value when infl ating a tire. When a tire is • Demounting tools apply pressure to rim fl anges to unseat in a restraining device, do not lean any part of your body or tire beads, and keep your fi ngers clear. Always stand to equipment on or against the restraining device. (If parts are one side and hold the tool with one hand when you apply improperly installed they may fl y apart with explosive force.) hydraulic pressure. (If the tool slips off, it can fl y with enough • Never attempt to weld on an infl ated tire/rim assembly or on force to cause serious injury or death.) a rim assembly with a defl ated tire. (Heat from welding will • Do not use tools in the vicinity of the fl ange butt weld. cause a sudden, drastic increase in pressure, resulting in an explosion with the force of a bomb. Defl ated tires can catch 3. AFTER DEMOUNTING fi re inside the air chamber.) • Clean rims and repaint to stop detrimental effects of 3. AFTER INFLATION corrosion and facilitate checking and tire mounting. Be very careful to clean all dirt and rust from the lock ring and gutter. • Make sure no air leakage can be suspected, especially in This is important to secure the lock ring in its proper position. tubeless tires. A fi lter on the air infl ation equipment to remove the moisture from the air line helps prevent corrosion. The fi lter should be OPERATION checked periodically to see that it is working properly. (Parts • Do not use under-infl ated tires. must be clean for a proper fi t - particularly the gutter section • Do not bleed or reduce air pressure to compensate for the which holds the lock ring in its proper position.) increase in pressure resulting from operation. • Do not use under-size rims. Use recommended rim for the MOUNTING tire. 1. BEFORE MOUNTING • Do not overload or over-infl ate tire/rim assemblies. Check for adequate rim strength if special operating conditions are • Check rim components for cracks. Replace all cracked, required. (Excessive overload can cause damage to the tire badly worn, damaged and severely rusted component with and rim assembly.) new parts of the same size and type. When a components • Never run a vehicle on one tire of a dual assembly. (The is in doubt, replace it. (Parts that are cracked, damaged or carrying capacity of the single tire and rim is dangerously excessively corroded are weakened. Bent or repaired parts exceeded, and operating a vehicle in this manner can result may not engage properly.) in damage to the rim and tire or cause a tire fi re.) • Do not, under any circumstance, attempt to rework, weld, • Never use a tube in a tubeless tire/rim assembly where the heat or braze any rim component that is cracked, broken rim is suspected of air leakage. (Loss of air pressure through or damaged. Replace with a new part that is not cracked, fatigue cracks or other fractures in a tubeless rim warns broken or damaged and which is of the same size and type. you of a potential rim failure. This safety feature is lost when (Heating may weaken a part to extent that it is unable to tubes are used with leaking rims. Continued use may cause withstand forces of infl ation or operation.) the rim to burst with explosive force.) • Check type of rim and make sure all parts of such rim are • Always inspect rims and wheels for damage during tire being assembled properly. Follow instruction manual of rim checks. (Early detection of potential rim failure may prevent or ask your distributor if you have any doubts.(Mismatched serous injury.) parts may appear to fi t, but when the tire is infl ated they may • Never add or remove an attachment or otherwise modify a fl y apart with explosive force.) rim (Especially by heating, welding or brazing) unless the tire • Mixing parts of one type rim with those of another is has been removed and approval has been received from the potentially dangerous. Always check rim with manufacturer rim manufacturer. (Modifi cation or heating of a rim or one for approval. of its parts may weaken it so that it cannot withstand forces • Remove rust, dirt and other foreign matter from the rim created by infl ation or operation.) surface, particularly on the bead seats and O-ring slot. • Never mount bias tire and radial tire on the same axle. Follow • Clean the inside of the tire. vehicle manufacturer’s recommendation. • Make sure tube and fl ap are correct and not damaged for • Never use tire under unintended service conditions for the tube type tires. tire. Please consult YOKOHAMA if vehicle operation requires • Always prepare a new O-ring for tubeless tires. specialized tire fi tment. • Do not reinfl ate a tire that has been run fl at or has been run GET YOUR JOB DONE ANYWHERE IN THE WORLD Specifi cations subject to change without notice. 08, 2017 CE226 01 Made in Japan. ©2017 by THE YOKOHAMA RUBBER CO., LTD. HB-TP Table of Contents 1 Outline of OFF-THE-ROAD TIRES 3 Tire Maintenance TRA Classifi cation of OFF-THE-ROAD TIRES ........2 Infl ation Pressure ............................................... 48 Tread Pattern .........................................................2 Load .....................................................................49 Tread Thickness .....................................................3 Speed ...................................................................49 Construction of OFF-THE-ROAD TIRES ................3 Proper Matching of Dual-Tires ...........................50 Tire Marking(Radial) .............................................4 Road Surface Maintenance ................................51 Size Identifi cation and Aspect Ratio ...................4 Tire Problems and Major Causes .......................51 Tire Specifi cation Code .........................................5 Instructions for Operations ................................52 Tires by Type of Vehicle ........................................6 Tire Appearance Check-up .................................52 Load Index .............................................................8 Measuring Tread Wear .......................................53 Speed Symbol .......................................................9 Ton-Kilometer-Per-Hour Conversion Table: Star Mark to Ply Rating .........9 (Ton-Mile-Per-Hour) ...................................... 54 Load-and-Carry Operation of YOKOHAMA OFF-THE-ROAD TIRES 2 Front-End Loaders ............................................56 Radial : Application Protecting Tires on Vehicle in Earthmover .....................................................10 Highway Drive-Away.......................................57 Loader & Dozer ..............................................11 Handling of Tires ............................................... 60 Grader .............................................................12 Safety Precautions for Demounting ................. 60 Mobile Crane ..................................................12 Safety Precautions for Mounting ......................61 Industrial ........................................................12 Safety Precautions for Operation ......................62 Radial : Technical Data Tire Storage ........................................................63