Operator Manual Owner manual

SECTION 4 - SERVICE AND MAINTENANCE
3121224 – Triple-L-Trailer – 4-17
4.12 TIRE AND WHEEL MAINTENANCE
Glossary of Tire and Loading Terminology
1. Cold Inflation Pressure - The pressure in the tire
before you drive. The term cold does not relate to
the outside temperature. Rather, a cold tire is one
that has not been driven on for at least three hours.
2. Gross Axle Weight Rating - The maximum weight
that any axle can support, as published on the VIN
label on the front left side of the trailer. Actual weight
determined by weighing each axle on a public scale,
with the trailer attached to the towing vehicle.
3. Gross Vehicle Weight Rating - The maximum
weight of the fully loaded trailer, as published on the
VIN label. Actual weight determined by weighing
trailer on a scale, without being attached to the tow-
ing vehicle.
4. Maximum Permissible Inflation Pressure - The
maximum cold inflation pressure to which a tire may
be inflated. Reference VIN Label for this value.
5. Production Options or Accessory Weight - Weight
of options or accessories not included in the base
weight of the trailer. Reference section 2.
6. Recommended inflation pressure - This is the
inflation pressure provided by the vehicle manufac-
turer on the Tire Information label and on the VIN
Label. Reference.
7. Vehicle Capacity Weight - The maximum cargo
weight the trailer is designed to carry.
Basic Tire Maintenance
Properly maintained tires improve the stopping, traction,
and load-carrying capability of your vehicle. Under inflated
tires and overloaded vehicles are a major cause of tire fail-
ure. Therefore, to avoid flat tires and other types of tire fail-
ure, you should maintain proper tire pressure, observe tire
and vehicle load limits, avoid road hazards, and regularly
inspect your tires.
Checking Tire Pressure
It is important to check your vehicle's tire pressure at least
once a month for the following reasons:
• Most tires may naturally lose air over time.
• Tires can lose air suddenly if you drive over a pothole
or other object or if you strike the curb when parking.
• With radial tires, it is usually not possible to determine
under inflation by visual inspection.
The recommended tire inflation pressure that vehicle man-
ufacturers provide reflects the proper psi when a tire is
cold. When you drive, your tires get warmer, causing the
air pressure within them to increase. Therefore, to get an
accurate tire pressure reading, you must measure tire
pressure when the tires are cold or compensate for the
extra pressure in warm tires.
Table 4-3. Tire Inflation Pressures
Models Tire(s) Used (Load Range)
Cold Inflation
Pressure
248
7610
7612
7614
7616
UT28
UT610
UT612
UT614
EC10
EC12
EC14
ST225/75D15;
ST225/75D15(D)
65 PSI
(450 KPa)
449
1012
1014
UT49
UT912
UT914
LT235/85R16(E);
ST235/85R16(D);
ST235/85R16(E)
see note
4610
UT410
8-14.5LT(G)
110 PSI
(760 KPa)
NOTE: Machines prior to S/N 0050002096
(Use load range E tires only)
S/N 0050002096 to S/N 0050003746
(Use load range D or E tires)
S/N 0050003747 to Present
(Use load range E tires only)
80 PSI
(550 KPa)
65 PSI
(450 KPa)
80 PSI
(550 KPa)