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: To avoid eye injury, use approved safety lenses, goggles, or face shield
to prevent eye injury when deflating tires.
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 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, the tire bead may bind
on the rim and refuse to seat. Replace the rims that are corroded and
weakened.
| 7.1. | Remove surface rust and other foreign matter from the rim. |
| 7.2. | Verify that the rim flanges and the bead ledge areas (especially
the hump and the radius) are smooth and clean. |
| 7.3. | Remove any of the following dried materials using a wire brush: |
| • | Tire mounting lubricant |
| 7.4. | 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: To avoid eye injury, use approved safety lenses, goggles, or face shield
to prevent eye injury when deflating tires.
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: Use an approved tire mounting compound such as Ru-Glyde®, Frey
Lube II® or equivalent. Do not use silicone-base compounds or corrosive-type
compounds. Silicone-base compounds can cause the tire to slip on the rim.
Corrosive-type compounds can cause tire and/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 core nut to 6 N·m (53 lb in).
- Lubricate the following
areas with a lubricant that will dry:
Important: Do not use a hammer when installing the tire onto the rim.
- With the short side 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. |
- 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.
