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can damage the tire or wheel and endanger the installer. Use a steel duck bill hammer only as a wedge. Do not strike the head of a hammer with another hard faced hammer – use a rubber mallet. 3. Apply the vegetable-based lubricant to all surfaces of the bead area of the tire. 4. Beginning at the valve, remove the tire from the wheel. Starting at the valve will minimize chances of damaging the valve assembly. Make certain that the rim flange with the tapered ledge that is closest to the drop center is facing up. Insert the curved ends of the tire irons between the tire and rim flange. Step forward into the drop center and drop the bars down, lifting the tire bead over the rim flange. Hold one tire iron in position with your foot. Pull the second tire iron out and reposition it about 90 degrees from the first iron. Pull the second tire iron towards the center of the wheel. Continue to work tools around wheel until first bead is off the wheel. 5. Lift the assembly, place and rotate the tire iron to lock on the back rim flange, allow the tire to drop, and with a rocking motion remove the tire from the wheel. PART 3: MOUNTING AND DEMOUNTING TUBE-TYPE TIRES A tire cannot perform properly unless it is mounted properly on the correct size wheel. The following are general instructions for demounting and mounting MICHELIN® tube-type tires. For detailed instructions on mounting and demounting truck tires on particular types of wheels, refer to the instructions of the wheel manufacturer or the RMA (Rubber Manufacturers Association) wall charts. e. Always install new valve cores and metal valve caps containing plastic or rubber seals. For tires requiring O-rings, be sure to properly install a new silicone O-ring at every tire change. Do not re-inflate any tires that have been run underinflated or flat without careful inspection for damage. If run-flat damage is detected, scrap the tire. A tire is considered run-flat if it is found to be less than 80% of normal recommended operating pressure. This can result in serious injury or death. The tire may be damaged on the inside and can explode during inflation. The wheel parts may be worn, damaged or dislodged and can explosively separate. 1. SELECTION OF PROPER COMPONENTS AND MATERIALS a. All tires must be mounted with the proper MICHELIN® tube and flap (if required) and wheel as indicated in the specification tables on Page 93 of the MICHELIN Truck Tire Service Manual (MWL40732). For complete tire specifications, refer to application specific data books. b. Make certain that wheel components are properly matched and of the correct dimensions for the tire. c. Always fit a new MICHELIN® tube in a new mounting. Since a tube will exhibit growth in size through normal use, an old tube used in a new mounting increases the possibility of tube creasing and chafing, possibly resulting in failure. d. Always install a new flap in a new mounting. A flap, through extended use, becomes hard and brittle. After a limited time, it will develop a set to match the tire and wheel in which it is fitted. Therefore, it will not exactly match a new tire and wheel combination. 6 f. Always use a safety device such as an inflation cage or other restraining device that will constrain all wheel components during an explosive separation of a multi- piece wheel, or during the sudden release of the contained gas of a single piece wheel that is in compliance with OSHA (Occupational Safety and Health Administration) standards. Do not bolt restraining device to the floor. Never stand over a tire or in front of a tire when inflating. Always use a clip-on valve chuck with an in-line valve with a pressure gauge or a presettable regulator. Additionally, ensure there is a sufficient length of hose between the clip-on chuck and the in-line valve (if one is used) to allow the service technician to stand outside the trajectory path when inflating. Trajectory zone means any potential path or route that a wheel component may travel during an explosive separation, or the sudden release of the pressurized gas, or an area at which the blast from a single piece wheel may be released. The trajectory may deviate from paths that are perpendicular to the assembled position of the wheel at the time of separation or explosion. NEVER WELD OR APPLY HEAT TO A WHEEL ON WHICH A TIRE IS MOUNTED. 2. TIRE AND WHEEL LUBRICATION It is essential that an approved tire mounting lubricant be used. Preferred materials for use as bead lubricants are vegetable based and mixed with proper water ratios per manufacturer's instructions. Never use antifreeze, silicones, or petroleum-base lubricants as this will damage the rubber. Lubricants not mixed to the manufacturer's specifications may have a harmful effect on the tire and wheel. The lubricant serves the following three purposes: • Helps minimize the possibility of damage to the tire beads from the mounting tools. • Helps ease the insertion of the tire onto the wheel by lubricating all contacting surfaces. General Instructions