Pierce Enforcer, Operator'S Manual

Page: 167 / 196

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Wheels and Tires / 6-45
MAINTENANCE
loading. Over-the-road tractor tandems do not exceed 34,000 pounds loading; whereas typical aerial apparatus
tandems may be loaded from 44,000 pounds to 58,000 pounds or higher. Since most aerial apparatus only operate
in congested areas with taller buildings, it is natural that they will experience a much greater proportion of their time
in accelerating, braking, and cornering – three of the most detrimental influences on tire life.
6-27.7 Tire Rotation
NOTE: When rotating tires with Counteract balancing beads, the technician should strike the tire tread to
dislodge the beads to promote rebalancing in the new axle position. See
“Balancing” on page 6-45 .
Front Tires
If irregular tire wear is found on the front axle tires, they should be moved to the rear axle position (if same size and
tread pattern) or replaced.
Rear Tires
If irregular wear such as heel and toe or alternate lug wear occurs, the tires should be rotated to reverse the rotation
of the tires. In tandem axle units, swap the right rear tire pair with the left front pair, keeping the outside tires in the
outside position. Swap left rear and right front pairs in the same manner.
6-27.8 Balancing
Wheel and tire assemblies should be balanced to avoid vibration or shimmy during road operation. Pierce balances
all tires and wheels by adding Counteract balancing beads to the tire/wheel during assembly. Once the balancing
beads are installed inside the tire, it is not possible to see them; no lead weights are used.
The beads automatically balance the complete wheel assembly as the tire rotates. The beads balance not only the
tire and wheel, but also the hub and brake assembly of the axle.
The beads continually adjust to changes on the tire and wheel to maintain balance. As the tire wears, the beads will
adjust properly so the assembly is always in balance. The beads will also adjust if tires become out of balance due
to mud in the tire tread or stuck to the wheel.
6-27.9 Tire Pressure Management Sensors
NOTE: The tire must be inflated to the correct pressure before installing the tire sensor valve cap to
calibrate and ensure proper operation.
If replacing a defective valve cap, inflate tire to the proper operating pressure (see “Tire Inflation” on page 6-42 ) and
install the new sensor on the valve stem.
See Tire Pressure Management System in the Operation chapter of this manual, and “LED Air Guard Tire Pressure
Monitoring System”, Group 0670-V-003 in the vehicle Service Manual for more information.
6-27.10 Emissions Related Tire Warranty
Oshkosh Corporation in conformance with 40CFR§1037.120 warrants to the ultimate purchaser and each
subsequent purchaser that the tires delivered with this new vehicle will be free from defects in materials
and workmanship that cause the vehicle to fail to conform to the requirements of 40CFR§1037 Control of
Emissions from New Heavy-Duty Motor Vehicles for 2 years or 24,000 miles.
6-27.11 Tire Replacement Information
NOTE: The rolling resistance of the tires on a vehicle contribute to the overall load on the engine, and
therefore can impact the level of emissions produced by the vehicle. The tires on your vehicle
have been selected by the Original Equipment Manufacturer (OEM) to conform to the
requirements of this law. Tires which have a higher rolling resistance than the original