TIRE MAINTENANCE MANUAL - Goodyear Off-The-Road (OTR)

and Front Axle Load =
(B/C X Payload + F =
(132/240 X 36,000) + 10,000 =
( .55 X 36,000) + 10,000 =
19,800 + 10,000 = 29,800
Our example also shows that the part of the
load on each axle is a percentage of the
wheelbase.
In our example, the distance from the center
of the payload to the front axle is 45%
of the wheelbase:
108/240 = .45 = 45%
This is the percentage of the load carried
by the rear axle.
The distance from the center of the payload
to the rear axle is 55% of the wheelbase:
132/240 = .55 = 55%
This is the percentage of the load carried
by the front axle.
WARNING
Burned beads are very dangerous. They can
cause a sudden loss of air that can lead to
death, serious injury or property damage.
These have been reported more than an
hour after a vehicle was parked.
Another risk is a loss of inflation long after the
machine is parked. When the machine is shut
down, cooling air does not circulate. The hot
brake quickly transfers heat to the rim base.
Air pressure builds and the bead becomes
hot and weak. Eventually, an explosive,
potentially dangerous rupture may occurs.
The air in an earthmover tire has extremely
high energy when released suddenly. Since
burned beads can lead to a sudden rupture,
extreme caution must be exercised.
Burned Beads
19
These percentages give us a ratio:
45:55 = 100.
This is important because it applies to any
load in that vehicle. Thus, it allows us
quickly to calculate the effects of lighter or
heavier loads.
Load Distribution on Other Types of
Carriers
The formula may be applied to all types of
wheeled machines. Some slight changes in
description may be needed, however.
For example, in a tractor/trailer combination:
The wheelbase is the distance from the
pivot point to the rear axle.
To determine the weight distribution on
the tractor:
The pivot point is the center of the load.
The load on the pivot point is the total
payload on the tractor.
The machine should be parked outside, remote
from all personnel.
DO NOT STAND NEAR A TIRE AND RIM AS-
SEMBLY WITH A HOT BRAKE.
Burned beads are usually caused by brake
problems. Excessive braking or dragging
brakes are the most common source.
Excessive braking can result in temperatures
up to 500º F (246º C). This heat is
transmitted through the brake drum to the
rim. The rim heats the inside bead and
burns it.
Temperature above 250º F (123º C) may
reduces bead durability.
Burned beads can cause several kinds of tire
failure.