MIL-DTL-62164E(AT)
installed and protected to prevent sharp bends, damage by abrasion and contact with the ground
or wheels during vehicle operation (see 4.5.2).
3.3.3.1 Walking beams. The suspension shall include two unsprung walking beams for
the first and second axles. Sufficient articulation shall be provided to maintain equal loading on
each end of walking beams under the following conditions:
a. With jounce bumpers removed and forward wheels on each beam elevated 8
inches (in.) above rear wheels (see 4.5.2).
b. With jounce bumpers removed and rear wheels on each beam elevated 8 in. above
forward wheels. Each walking beam shall be interchangeable with one another
(see 4.5.2).
3.3.3.2 Air springs. The suspension system shall include four air springs for the third
and fourth axles. The air springs shall facilitate the load distribution. The air suspension shall
have an 8-in. minimum travel. A second air system shall raise the two rear axles. The combined
systems shall permit changing all wheels without the use of a jack while vehicle is unloaded on
level surface and the tires on the rear two axles when loaded. Suspension air pressure drop shall
not exceed 5 pounds per square inch (psi) in a 1-hour period with 85 psi initially in the
suspension system, and an ambient temperature of 70 plus or minus (±) 10 degrees Fahrenheit
(F) (see 4.5.2).
3.3.3.3 Shock absorbers. Shock absorbers, adequate to dampen the air suspension, shall
be installed on the two rear axles (see 4.5.2).
3.3.3.4 Seals. With the vehicle operating under condition of specified terrain (see
table V) and during fordings (see 4.3.5.9), the seals shall restrict the entrance of foreign matter
into the bearings, which are exposed to contamination during these operations. Seals shall limit
water contamination of lubricants and water contamination shall not exceed 2 percent (%) by
volume. All bearing seals shall prevent the leakage of lubricants from the bearings (see 4.5.2).
3.3.3.5 Tires. The tires shall be 15 x 19.5 with a 14-ply rating and with 60 to 65 psi air
pressure and have a manufacturer's recommended load rating such that 25 000 pounds (lbs) per
axle can be placed on any axle at maximum speeds and 50 000 lbs per axle at speeds up to 5
miles per hour (mph) for short periods of time (see 4.5.2).
3.3.3.5.1 Tire life. Average tire life to removal from service shall be not less than 9000
miles (see 4.5.2).
3.3.3.5.2 Spare tire assembly. One spare wheel and tire assembly shall be furnished and
stored securely in a readily accessible space which shall permit removal of the tire and wheel
assembly when the vehicle is loaded. Removal and replacement shall be accomplished by two
men (see 4.5.2).
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