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|  MIL-S-62359(AT)
3.4.3 Axles. The semitrailer shall be equipped with tandem axles. Axle ratings shall be at
least equal to the load imposed on each axle, measured at the ground, with the semitrailer loaded
with the specified payload. The wheel bearings and axle spindles shall be oil lubricated. Oil
viscosity shall be in accordance with the manufacturer's recommendations. The hub caps shall
have a metal or heavy duty plastic body and a window for visual determination of oil level.
Provision for venting, or equivalent method of withstanding pressures without leakage, and for
replenishing the oil supply, shall be incorporated.
3.4.3.1 Undercarriage protection. Undercarriage protection shall be provided to prevent
damage to axle, suspension and brake components from material during windrowing operations or
spillage during loading.
3.4.4 Wheels, rims, tires and tubes. The semitrailer shall be equipped with dual wheels on
each axle. Rims and tire ratings shall conform to Tire and Rim Association recommendations for
the type and size of tires furnished. Tire and rim sizes shall be the same for all wheels of the
semitrailer. When specified (see 6.2), disc type wheels shall be furnished.
3.4.4.1 Tires. Steel belted radial ply tires or, when specified (see 6.2), bias ply tires shall
be furnished. Tires shall be tube or tubeless type with highway tread. Tires shall be of rated
capacity at least equal to the load imposed on each tire, measured at each wheel at the ground,
when the semitrailer is loaded with the specified payload. Tires shall conform to Tire and Rim
Association recommendations or to ZZ-T-381 with a size designation system the same as the Tire
and Rim Association.
3.4.4.2 Inner tubes. When tube type tires are furnished, inner tubes shall be heavy duty
type, and shall be of proper size for the tires furnished.
3.4.4.3 Carrier for spare tire assembly. When specified (see 6.2), a carrier for a spare
wheel or rim and tire assembly shall be installed in a readily accessible location under the chassis.
Means shall be provided for securing the spare assembly within the carrier to prevent accidental
loss.
3.4.4.4 Spare wheel or rim. When specified (see 6.2), a spare wheel or rim shall be
furnished. When a spare tire assembly is specified (see 3.4.4.5), a spare wheel or rim shall be
furnished.
3.4.4.5 Spare tire assembly. When specified (see 6.2), a spare tire assembly shall be
furnished. The spare tire assembly shall include an inflated spare tire mounted on the spare wheel
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