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Wheel splash and stone throw protection |
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|  MIL-T-62735
tie-back straps, one bolted to each side of the rear portion of the body subframe. Tie-back straps
shall maintain body alinement on the vehicle chassis. Forward body mounting bolts shall be to
the rear of the tapered portion of the breaker strips (see 3.5.3.3).
3.5.3.2 Brackets. When brackets are used, they shall be bolted to the web of the chassis
frame rails. The body mounting brackets shall provide means for drawing down the body on the
chassis rails. Provisions shall be made to prevent lateral shifting of the breaker stripe. When
additional holes are required to secure mounting brackets to the chassis frame rails, they shall be
made in the frame in areas designated as safe for drilling in accordance with the chassis
manufacturer's body builder's layouts.
3.5.3.3 Breaker strips. The vehicle chassis frame shall have hardwood or dense southern
yellow pine breaker strips, not less than 75 mm (3/4 inch) finished thickness, between the body
longitudinal sills and the chassis frame rails. The minimum thickness specified shall be
increased as may be required to provide adequate tire chain-to-body clearance. Breaker strips
shall have a taper of not less than 13 mm (1/2 inch) in 410 to 460 mm (16 to 18 inches) at the
forward end. The taper shall face the chassis frame.
3.5.4 Wheel splash and stone throw protection. Stake, dump, van, and refrigerator van
trucks shall have rigid splash shields ahead of the rear wheels and rubber mud flaps to the rear of
the rear wheels. Truck tractors shall have rigid quarter fenders to the front of the rear wheels and
rubber mud flaps to the rear of the rear wheels. The quarter fenders need extend down only to
the height of the centerline of the rear axle.
3.5.4.1 Splash shield and mud flap installation. All splash shield and mud flap
installations, front and rear, shall conform to the rear wheel splash and stone throw protection
provisions of SAE J682. Truck tractor mud flaps and their extension supports shall be readily
removable, to increase landing wheel clearance, without the use of hand tools.
3.5.4.2 Splash shield and mud flap mounting. Mud flaps shall be mounted with a metal
strip not less than 3.2 mm (0.125 inch) thick and not less than 25 mm (1 inch) wide. The metal
strip shall extend the entire width of the mud flap, to prevent the bolt heads or halt nuts from
damaging the mud flap. As an alternate method of attachment, the mud flaps shall have tabs or
clips with minimum surface contact dimensions of 25 mm (1 inch) high by 32 mm (1.250 inch)
wide by 2.4 mm (0.094 inch) thick at each bolt.
3.5.5 Rear end underride protection. The vehicle shall have rear end underride
protection in accordance with FMCSR 393.86, except for truck tractors and dump trucks. There
shall be a rear bumper as specified herein or in referencing documents for the various vehicle
types.
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