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Landing gear range of adjustment. |
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|  MIL-S-62095C(AT)
have a turned up lip not less than 50 mm (2 inches) high. The pickup plate shall extend
sufficiently forward to protect the semitrailer from damage during coupling and uncoupling
operations to and from a truck tractor. The pickup plate shall be integral with the upper fifth
wheel plate.
* 3.11.3 Kingpin. A 50 mm (2-inch) diameter kingpin conforming to SAE J700 shall be
furnished. The kingpin shall be fabricated of heat treated alloy steel.
* 3.12 Landing gear. The semitrailer shall have two vertical lift, telescopic, nonrotating,
landing legs with two-speed gears, and a hand crank on the curbside. Landing legs shall be
provided with self-leveling skid pads of not less than 250 mm by 250 mm (10 inch by 10 inch)
square bearing area. A holder shall be provided for the hand crank when not in use. The landing
gear shall withstand, without deformation, the combined static and dynamic forces due to the
portion of the gross weight sustained, and the additional forces resulting from impact during
coupling and uncoupling operations. When placed in the travel position, the landing gear legs
shall remain positively locked. The landing gear shall be protected to prevent the entrance of
foreign matter which would impair its functioning or mechanical efficiency. The semitrailer shall
not nose over when resting on the landing gear.
* 3.12.1 Landing gear range of adjustment. The landing gear shall have a range of adjustment
sufficient to vary the height of the upper fifth wheel plate at the kingpin from 1190 mm
(47 inches) to not less than 1320 mm (52 inches) from the ground for the size 2 semitrailer, and
from 1190 mm (47 inches) to not less than 1370 mm (54 inches) from the ground for the size 4
semitrailer. The minimum ground clearance with the landing gear retracted shall be 280 mm
(11 inches).
* 3.12.2 Air/hydraulic powered landing gear. When specified (see 6.2), in addition to the
requirements of 3.12 and 3.12.1 (less hand crank, etc.), the landing gear shall be air/hydraulic
powered. The landing gear system shall include a control box equipped with a 12-volt dc motor
driven pump, master control valve, leveling valve, booster, main oil tank, air side oil tank, key
switch and mounting hardware.
* 3.13 Lighting. All lights and reflectors shall be protected from operational hazards by
mounting in recessed or otherwise guarded locations. Lights and reflectors shall not be mounted
on vertical surfaces of rub rails (unless recessed and fully protected) or on the semitrailer bumper.
All electrical wiring shall conform to SAE J1292. Clearance and identification lights shall be
constructed for easy removal and replacement of lamps and lenses without the use of any tools.
3.13.1 Twelve-volt direct current (dc) system. A 12-volt dc lighting system conforming to
3.13 and 3.13.2 shall be provided. The 12-volt dc lighting system shall conform to Federal Motor
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