specified herein. Reinforcements shall extend at least from the rear of the front suspension, rear
hanger bracket to the front of the rear spring, front hanger bracket. The chassis frame rails shall
not project beyond the rear end of the tank body or the rear bumper.
3.4.8 Suspension. The vehicle shall be equipped with a suspension system with
components having a rated capacity at least equal to the load imposed on each member,
measured at the ground, with the vehicle loaded to specified GVW. When the suspension
capacity is rated at the spring pads, unsprung weight shall be deducted. The vehicle shall be
equipped with hydraulic, double-acting shock absorbers at the front wheels.
3.4.9 Axles. Axle ratings shall be at least equal to the load imposed on each axle,
measured at the ground, with the vehicle loaded to specified GVW. On classes 16 and 19, unless
a two-speed axle is furnished, a single reduction rear axle shall be provided. When specified
(see 6.2), the wheel bearings and axle spindles shall be oil lubricated. The hubcaps on non-drive
axles shall have a window for visual determination of oil level. Provisions for venting or
withstanding internal pressure buildup and for replenishing the oil supply shall be provided.
18.104.22.168 Two-speed axle. When specified for model 4x2 or 6x4 vehicles (see 6.2), a
two-speed axle shall be furnished, equipped with electric vacuum or air shift and provided with
ratios which will permit proper gear splitting. Gear ratios shall provide the performance
specified in 3.3.1 through 22.214.171.124.
126.96.36.199 Traction control. When specified (see 6.2), a traction control shall be furnished
on the rear axle of model 4x2 and 4x4 vehicles, and on either rear axle of the rear bogie on
model 6x4 and 6x6 vehicles. The traction control shall actuate automatically to ensure that
power is transmitted to the wheel having traction when the opposite wheel loses traction.
Maximum traction capabilities shall be maintained at all times under each drive wheel for the life
of the vehicle.
188.8.131.52 Rear bogie. Model 6x4 and 6x6 vehicles shall be equipped with a rear bogie.
The rear bogie shall be of the four-wheel type, complete with axles, springs, torque rods, and all
other necessary parts. The bogie shall be provided with means permitting differential action
between the two axles, and a manually or automatically controlled lockout assuring equal power
to each rear axle. The manual lockout control shall be located in the truck cab. Axle gear ratios
shall provide the performance specified in 3.3.1 through 184.108.40.206.
3.4.10 Wheels, rims, tires and tubes. Unless wide base tires are specified, the vehicle
shall be equipped with single front and dual rear wheels. Except as specified herein, rims and
tire ratings shall conform to The Tire and Rim Association or European Tyre and Rim Technical