MIL-S-45152H
* 3.8.4.7 Engine. Unless otherwise specified (see 6.2), an air cooled, four-stroke cycle gasoline engine shall be furnished to drive the hydraulic pump. When specified (see 6.2), an air cooled, diesel engine shall be furnished. The engine shall have adequate horsepower, torque and speed characteristics to meet the performance requirements of 3.8.4.2. The engine shall be furnished complete with all accessories required for operation including a fuel tank with not less than a 3-gallon capacity; a 12-volt starting battery of the maintenance-free type, having the maintenance-free characteristics listed in W-B-131; a battery charging alternator; a fuel
indicator, air cleaner, fuel gage, battery charging indicator, throttle, choke (gasoline engine), engine starting and stopping controls and all other components required to power the hydraulic system. The oil drain shall be located so that the system can be drained, without spillage, into a container sitting on the ground.
3.8.4.8 Radio interference suppression. The engine shall be suppressed to limit electromagnetic radiation in accordance with SAE J551.
* 3.8.4.9 Engine sound level. The engine noise level during operation shall be not more than
84dB(A) when measured in accordance with MIL-STD-1474. The noise level shall be measured
at the operator's station adjacent to the controls with the operator standing on the ground.
* 3.8.4.10 Landing gear for semitrailers with a hydraulic folding gooseneck. The semitrailer shall have two hydraulically operated landing legs or fixed landing pads. When landing legs are furnished, they shall be equipped with self-leveling landing pads not less than 100 square inches in area. The landing legs shall be capable of being hydraulically extended to the operating positions and hydraulically retracted to allow the gooseneck to fold to the ground as specified in
3.8.4 with full payload, without any evidence of any type of component failure, deformation,
permanent set or misalinement. The landing gear shall withstand, without deformation, the combined static and dynamic forces due to the proportion of the gross weight sustained and the forces resulting from impact during coupling and uncoupling operations. When placed in travel position, the landing gear legs shall remain locked. The landing gear shall be protected to prevent the entrance of foreign matter which would impair its functional or mechanical efficiency.
3.8.4.11 Range of adjustment for class D folding gooseneck landing gear. The landing gear shall have a range of adjustment sufficient to vary the height of the upper fifth wheel from
47 inches to not less than 53 inches from the ground for sizes 15, 20, 25 and 35 and from
52 inches to not less than 58 inches from the ground for sizes 50, 60, and 75. Sizes 50, 60 and 75 shall be able to raise the folding gooseneck off of the fifth wheel on truck tractors with a fifth wheel height as great as 58 inches. With the semitrailer coupled to a towing tractor and in a level position, the clearance under the fully retracted landing gear for all sizes, shall exceed the semitrailer ground clearance and further, shall be not less than 11 inches.
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