JLG sky trak mmv Service Manual page 213

8. Install a new valve stem into the valve stem hole on
the wheel.
9. Center the tire on the wheel. Inflate the tire until it
fully seats on the wheel rim or to 35 psi (241,1 kPa).
DO NOT exceed 35 psi (241,1 kPa). Use an extension
hose with a clip-on air chuck and pressure gauge to
permit the installer to stand at a safe distance from
the tire. Each tire bead will usually snap or pop into
place, indicating that the bead is seated.
Note: If either bead should fail to seat at 35 psi
(241,1 kPa), the tire may be pinched or another source
may be interfering with proper mounting. DO NOT
increase inflation pressure to seat the beads. Remove
the valve core and completely deflate the tire. Break both
beads loose from the rim and inspect the tire, rim and
inner tube, if applicable. Lubricate the tire bead, install
the valve core and repeat the 35 psi (241,1 kPa) inflation
procedure until the beads seat properly.
10. After the beads have seated, remove the valve core
and fully deflate the tire, but DO NOT break the bead
or separate the tire from the wheel. Re-install the valve
core and inflate the tire to 87 psi (600 kPa).
e. Tire Speed and Road Surface Limitations
The tires on this vehicle are designed for low-speed op-
erations not to exceed 25 mph (40 km/hr). If the vehicle is
towed at high speeds, high temperatures may develop
under the tread bars, causing a shifting of the tread bars
and a weakening of the tire material and cord fabric.
There may be no visible evidence of this type of damage,
but later, a failure can occur. If tires are to operate for any
length of time on a paved road, highway or other hard sur-
face, increase pressure in the tire to the maximum
amount recommended by the tire manufacturer to help
reduce the chances of damage, or arrange to have the
vehicle transported on a flat-bed truck.
Model MMV Rev. 12/04
Axles, Wheels and Tires
f. Care and Storage of Tires
Store unmounted tires vertically, standing on their tread.
If stored for an extended period of time, rotate the tires
periodically to help reduce stress concentrations in the
ground contact area of the tread. Tires should not be
stored flat or stacked vertically ("stove piped") as they will
become flattened and distorted, making mounting diffi-
cult, particularly for tubeless tires.
Store mounted tires as noted above, but reduce the infla-
tion pressure to 10 psi (68,9 kPa).
Store tires indoors in a cool, dark, dry area away from
drafts. Heat and light can cause oxidation on the tire sur-
face, which leads to decomposition ("crazing") and
weather checking. NEVER store tires on oily surfaces or
in contact with oil, grease, petroleum-based substances,
anti-freeze or solvents. Tires should not be stored near
volatile substances. Tires absorb volatile substances,
which damage and weaken the tire.
Tires should not be stored outside or in direct sunlight. If
there is no other alternative, tires stored outside must be
covered or otherwise protected from sunlight, wind and
rain. Use an unbroken, opaque covering to help protect
tires stored outdoors.
Store tires away from electric motors, generators, arc
welders, etc., as these generate ozone, which attacks
rubber and causes crazing and weather checking.
Exposure to weather will also cause cracking or crazing
of the rubber as well as deterioration of the tire carcass,
particularly where rainwater is permitted to accumulate in
the tire.
When extended vehicle storage is anticipated, the vehicle
should be placed on suitable supports with the tires
raised out of ground contact. Inflation pressure in the tire
should then be reduced to 10 psi (68,9 kPa). Keep the
tires out of contact with sunlight, wind and rain as noted
above.
If it is not possible to raise the vehicle, increase tire infla-
tion pressure by 25 percent. Move the vehicle periodically
to change the location of stress concentrations in the tire
ground contact area.
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