Tire Dismounting and Mounting Tube-Type Tire

Caution: Servicing of tires mounted on multi-piece rims requires proper tools, safety equipment, and specialized training. Severe injuries can result from improper servicing techniques. It is recommended that tires on multi-piece rims be serviced only by competent personnel with proper equipment. Be careful not to drop wheel and tire assemblies on your hands and feet. Lift properly, using your legs as well as your body. Wheels and tires are heavy and can cause injury if not handled correctly.

Caution: Use of eye goggles is necessary to prevent personal injury.

1. Completely deflate the tire prior to demounting. If the rim is damaged, deflate the tire prior to removal of the tire and rim assembly from the vehicle. Reduce the pressure by pushing in the valve core, or remove the entire core. Keep your eyes away from the valve. Do not gouge or nick the wheel or the rim when you remove the tire.




Caution: Failure to comply with these procedures may result in faulty positioning of the tire and/or rim parts, and cause the assembly to burst with explosive force, sufficient to cause serious physical injury or death. Never mount or use damaged tires or rims.

Important: Before removing the tire and rim assembly from the truck, deflate the tire completely by removing the valve core. On duals, deflate both tires completely.

2. Place the assembly on the floor, side ring up.
3. Insert the hooked end of the tool between the side ring and the side wall of the tire. Pry the bead loose from the side ring, using a downward pressure on the rim tools.
4. Continue to pry progressively around the tire until the bead is completely free from the side ring.



5. With the side flange and the tire bead pushed down, insert the tapered end of the tool into the notch near the split in the lock ring. Push downward in order to pry the lock ring from the gutter groove of the rim base.



6. Use the hooked end of the tool in order to complete the removal of the lock ring, progressively working around the tire.
7. Turn the assembly over and unseat the second tire bead from the rim.
8. Lift the rim from the tire. Remove the tube and the flap, if any, from the tire.
9. Clean and inspect the rim and the parts. Replace the parts as necessary.

1. Verify that the rim flanges (1) and the bead ledge (2) areas, especially the hump and the radius are smooth and clean.
2. Remove any dried material using a wire brush:

•	Tire mounting lubricant

•	Surface rust

•	Heavy paint

3. If the steel wheels show any bare metal, paint the wheels with a good grade of aluminum paint or equivalent. This will prevent rust.

Caution: Only use mounting equipment tools specifically designed for tire mounting. Do not use improvised tools. Failure to observe this precaution could cause serious injury to you or other personnel in the area.

Caution: Be careful not to drop tire and wheel assemblies on your hands and feet. Lift properly, using your legs as well as your body. Tires and wheels are heavy and can cause injury if not handled correctly.

Caution: Allowing pressure to continue to build up within a tire in an attempt to seat the bead is a dangerous practice that can result in a broken tire bead and possible serious injury to the technician.

Notice: When mounting the tires, use an approved tire mounting lubricant. DO NOT use silicon or corrosive base compounds to lubricate the tire bead and the wheel rim. A silicon base compound can cause the tire to slip on the rim. A corrosive type compound can cause tire or rim deterioration.

Important: Do not use rims, locking rings, or flanges that are out of shape, rusted, or broken. Do not use a ring or rim parts of a different manufacture than the rim, or of a different size or type than the rim.

Important: When tires are mounted on dirty or corroded rims, or when tires are not properly centered on the rims, the tire bead may bind on the rim and refuse to seat. A buildup of rust and foreign material in the rim gutter may prevent the proper fitting of rings. Replace corroded and weakened parts.

4. Whenever you mount a tube-type tire, observe the following:

•	Replace damaged parts. Before mounting a tire and assembling the rim, inspect the rim part carefully for the following conditions:

-

Damage

-

Rust

-	Distortion

•	Remove surface rust and other foreign matter.

•	Verify that the flange with the tapered ledge that has the shortest span to the drop center is facing up.

•	Use the correct size tires and rims. Use only proper size rims. Do not exceed the recommended air pressures.




5. Insert the tube into the tire and partially inflate the tire in order to round out the tube.
6. Apply a rubber lubricant to the inside and outside surfaces of both beads. Apply a rubber lubricant to that portion of the tube that appears between the beads.
7. Insert the flap and lubricate the flap.
8. Lay the rim flat on the floor with the valve slot up.
9. Align the valve with the rim valve slot. Place the tire onto the rim. Insert the valve through the valve slot.



10. Place the side flange on the rim base.
11. Stand on the flange in order to position the flange below the gutter grooves in the rim base.



12. Snap the leading end of the lock ring into the gutter groove of the rim base and progressively "walk" the lock into place.
13. Verify that the lock ring is fully seated in the gutter groove.



14. Place the tire in a safety cage.
15. Inflate the tire to approximately 10 psi, using an extension hose which is equipped with an air gage and a clip-on air chuck.
16. Verify that the lock-ring is engaged properly. If assembly is not proper, deflate the tire and correct the condition. NEVER hammer on an inflated or a partially inflated tire/rim assembly.
17. If assembly is proper, continue to inflate the tire to its recommended inflation pressure.
18. Verify that the beads are seated properly.
19. Completely deflate the tire in order to prevent localized overstretching of the tube and the flap.
20. Reinflate the tire to its recommended pressure.