Lull 944E-42 Service Manual - Manual (Page 171)

5.25 Model 644E-42/944E-42 Rev. 6/04
Axles, Drive Shafts, Wheels, Tires and Brakes
e. Tire Speed and Road Surface Limitations
The tires and axles on this vehicle are designed for
low-speed operations not to exceed 25 mph (40 km/h). If
the vehicle is towed at high speeds, high temperatures
may develop in the axle gears and under the tire 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 surface, 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.
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
difficult, particularly for tubeless tires.
Store mounted tires as noted above, but reduce the
inflation 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
surface, 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 tires
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
inflation pressure by 25 percent. Move the vehicle
periodically to change the location of stress
concentrations in the tire ground contact area.