Tire Dismounting and Mounting Tubeless Tire
Demounting Procedure
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.
- 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.
- With the tire assembly lying flat, break the bead seat of both beads
with a bead breaking tool.
- Apply a proper tire lubricant such as Frey Lube II®
lubricant or equivalent to the following areas:
Important: Verify that the flange with the tapered ledge (1) that has the shortest
span to the drop center is facing up.
- 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.
- Remove the following components from the rim:
Caution: To avoid eye injury, use approved safety lenses, goggles, or face shield
when using buffing and cleaning equipment.
- Clean the rim of the following materials:
- 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 |
| • | If the steel wheels show any bare metal, paint the wheels with
a good grade of aluminum paint or equivalent. This will prevent rust. |
- Inspect the rim for the following conditions. If the rim is damaged,
replace the rim.
Mounting Procedure
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.
- Use the correct size tires and rims.
- 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.
- 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 valve stem nut to 6 N·m (53 lb in).
- Lubricate the following
areas. Use an approved tire mounting compound such as Ru-Glyde®, Frey
Lube II® or an equivalent.
Important: Do not use a hammer when installing the tire onto the rim.
- 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 Description
in General Information. |
| • | 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. |
- 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.
Tire Dismounting and Mounting Tube-Type Tire
Demounting Procedure
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.
- 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.
- Place the assembly on the floor, side ring up.
- 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.
- Continue to pry progressively around the tire until the bead is
completely free from the side ring.
- 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.
- Use the hooked end of
the tool in order to complete the removal of the lock ring, progressively
working around the tire.
- Turn the assembly over and unseat the second tire bead from the
rim.
- Lift the rim from the tire. Remove the tube and the flap, if any,
from the tire.
- Clean and inspect the rim and the parts. Replace the parts as
necessary.
Mounting Procedure
Caution: To avoid eye injury, use approved safety lenses, goggles, or face shield
when using buffing and cleaning equipment.
- Verify that the rim flanges (1) and the bead ledge (2) areas (especially
the hump and the radius) are smooth and clean.
- Remove any dried material using a wire brush:
| • | Tire mounting lubricant |
- 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.
- 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: |
| • | 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. |
- Insert the tube into the
tire and partially inflate the tire in order to round out the tube.
- 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.
- Insert the flap and lubricate the flap.
- Lay the rim flat on the floor with the valve slot up.
- Align the valve with the rim valve slot. Place the tire onto the
rim. Insert the valve through the valve slot.
- Place the side flange
on the rim base.
- Stand on the flange in order to position the flange below the
gutter grooves in the rim base.
- Snap the leading end of
the lock ring into the gutter groove of the rim base and progressively
"walk" the lock into place.
- Verify that the lock ring is fully seated in the gutter groove.
- Place the tire in a safety
cage.
- Inflate the tire to approximately 10 psi, using an extension
hose which is equipped with an air gage and a clip-on air chuck.
- 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.
- If assembly is proper, continue to inflate the tire to its recommended
inflation pressure.
- Verify that the beads are seated properly.
- Completely deflate the tire in order to prevent localized overstretching
of the tube and the flap.
- Reinflate the tire to its recommended pressure.
