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Wheel sp1ash and stone throw protection |
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|  MIL-T-62491C
3.1.1.6 Wheel sp1ash and stone throw protection. Rubber mud flaps shall be provided to the
rear of the rear wheels. Tilt cabs shall also have rubber mud flaps to the rear of the front wheels.
A metal strip not less than 3.2 millimeters (mm) 0.125 inch thick and not less than 25 mm
(one inch) wide, extending the entire width of the mud flap, shall be installed to prevent the bolt
heads or bolt nuts from damaging the mud flap. As an alternate method of attaching the mud
flaps, tabs or clips with minimum surface contact dimensions of 25 mm (1 inch) high by 32 mm
(1.25 inch) wide by 2.4 mm (0.094 inch) thick shall be furnished at each bolt. Mud flap
installations front and rear shall conform to the rear wheel splash and stone throw protection
provisions of SAE J682.
* 3.1.1.7 Trailer towing package, class 21. A trailer towing package shall be furnished on
class 21. The trailer towing package shall consist of a pintle, safety chain attachment devices, a
lighting receptacle and associated reinforcements and wiring installed on the rear of the vehicle.
The pintle shall be of the rotating type conforming to MS 51335-1. The pintle shall be installed
on the backplate (see 3.5.4 and 3.6.4) with reinforcements to transfer a vertical tongue load of not
less than 815 kilograms (kg) (1,800 pounds) and a horizontal drawbar load of not less than
80 kilonewtons (kN) (18,000 pounds) directly to the chassis frame rails. Two trailer safety chain
attachment devices, one adjacent to each side of the pintle, shall be provided. Each attachment
device shall provide an ultimate strength at least equal to the GVW of the wrecker furnished. The
attachment devices shall be capable of accommodating a standard grab hook
[(56 mm (2-3/16 inches) wide, 18.7 mm (47/64 inch) thick and 12.3 mm (31/64-inch) throat
width)] for a 9.6 mm (3/8-inch) chain. The lighting receptacle, conforming to SAE J560 with its
conductors connected and color-coded as specified therein, shall be mounted in a readily
accessible location near the pintle. The pintle height shall be in proportion to the frame height.
* 3.1.1.8 Trailer towing package, classes 24 through 50. A trailer towing package shall be
furnished, except on hydraulic wreckers with a wheel lift (see 3.5.12), on classes 24 through 50.
The trailer towing package shall consist of a pintle, safety chain attachment devices, a lighting
receptacle, a trailer brake control system and associated reinforcements and wiring installed on the
rear of the vehicle. The pintle shall be of the rotating type conforming to MS 51118. The pintle
shall be installed on the backplate with reinforcements to transfer a vertical tongue load of not less
than 1815 kg (4,000 pounds) and a horizontal drawbar load of not less than 178 kN
(40,000 pounds) directly to the chassis frame rails. Two trailer safety chain attachment devices,
one adjacent to each side of the pintle, shall be provided. Each attachment device shall provide an
ultimate strength of not less than 178 kN (40,000 pounds). The attachment devices shall be
capable of accommodating a standard grab hook [(116 mm (4-9/16 inches) wide, 30 mm
(1-3/16 inches) thick, 19.8 mm (25/32-inch) throat width)] for a 16 mm (5/8-inch) chain. The
lighting receptacle, conforming to SAE J560 with its conductors connected and color-coded as
specified therein, shall be mounted in a readily accessible location near the pintle. The trailer
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