Tire Dismounting and Mounting Tubeless 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.

Notice: Wheel hub flanges, wheel studs, and stud nuts should be free of rust, lubricants, dirt, and finish color paint on all contact surfaces to ensure proper torque retention.

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 stem, or remove the entire core. Keep your eyes away from the valve.

Important: Do not use a hammer when breaking the tire beads.

2. With the tire assembly lying flat, break the bead seat of both beads with a bead breaking tool.
3. Apply a proper tire lubricant such as Frey Lube II® lubricant or equivalent to the following areas:

•	The tire beads

•	The rim ledges

•	The flanges





Important: Verify that the flange with the tapered ledge (1) that has the shortest span to the drop center is facing up.

4. Beginning at the valve, remove the tire using tire irons designed for this purpose:

•	Starting at the valve will minimize the chances of damaging the bead.

•	At any given time, you will not be working on some areas of the bead. Always attempt to retain these areas in the full depth of the drop center cavity.





Important: Always replace the valve core when you replace the tires.

5. Remove the following components from the rim:

•	The valve core nut (1)

•	The washer (2)

•	The valve core (3)

Caution: To avoid eye injury, use approved safety lenses, goggles, or face shield when using buffing and cleaning equipment.

6. Clean the rim of the following materials:

•

Dirt

•

Corrosion

•	Light rust

7. When the tires are mounted on dirty or corroded rims, or when the tires are not properly centered on the rims, then the tire bead may bind on the rim and refuse to seat. Replace the rims that are corroded and weakened:

•	Remove surface rust and other foreign matter from the rim.

•	Verify that the rim flanges and the bead ledge areas, especially the hump and the radius, are smooth and clean.

•	Remove any dried material using a wire brush:

-	Tire mounting lubricant

-	Surface rust

-	Heavy paint

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

8. Inspect the rim for the following conditions. If the rim is damaged, replace the rim.

•

Cracks

•

Bends

•

Corrosion

•	Heavy pitting

•

Rust

•	Distortion

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

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.

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: Use only proper size rims and do not exceed the recommended air pressures as specified on the vehicle certification label.

1. Use the correct size tires and rims.



2. Place the valve stem (3) with a rubber washer (2) through the valve hole from the tire side of the rim.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Screw on the valve nut (1) from the opposite side. Center the rubber bushing and the metal collar and the nut so that these parts fit snugly in the valve hole.

Tighten
Tighten the nut to 6 N·m (53 lb in).




4. Lubricate the following areas. Use an approved tire mounting compound such as Ru-Glyde®, Frey Lube II® or an equivalent.

•	The tire beads

•	The rim flanges

•	The bead ledge





Important: Do not use a hammer when installing the tire onto the rim.

5. With the short side (1) facing up, lay the tire over the rim at the valve side. Work the tire on with the proper tubeless tire tools. Use the well in the drop center to its fullest extent.




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.

Important: 

•	Use only dry air for tire inflation. Use a moisture trap on the air lines leading from the air compressor.

•	Do NOT overload the tires. Verify that the load and vehicle weights do not exceed the rated load of the tires. Rims are designed to sustain the maximum rated load of the maximum tire size recommended for that rim. For the recommended rated load and tire size, refer to Vehicle Certification Label

•	Do NOT exceed the maximum inflation pressures. Inflation pressures are determined by the size and the ply rating of the tire. Refer to the manufacturers specification for proper inflation. Keep equal inflation in both tires of a dual assembly so that the weight is equally distributed.

6. Inflate the tire in a safety cage using an extension hose equipped with an air gage and a locking chuck. Inspect for proper bead seating by comparing the design elements on the circumference of the tire and at the top of the rim flange. These design elements should be equally spaced around the tire.