1、 INCH-POUND A-A-50579 AD 14. 1997 SUPERSEDING 5 July 1991 MIL-T-29233A(YD) COMMERCIAL ITEM DESCRIPTION TRAILEK EQUIPMENT, ELEVATING BODY, 4-WHEEL The General Services Administration has authorized the use of this commercial item description by all Federal agencies. 1. SCOPE. This commercial item des
2、cription (CID) covers a 4-wheel, 12,000 pound (lb) (5 436 kilogram (kg) load capacity, vehicle and equipment transporting trailer with capabilities of lowering and elevating the body (bed) for loading and unloading at ground and loading dock levels. The trailer is intended for use loading, transport
3、ing, and unloading forklifts in areas where there may be no ramps or other facilities to assist. The trailer may be used on improved and unimproved roadways having grades usually found on main and access roads in and about military bases. 2. CLASSIFICATION. This section is not applicable to this com
4、mercial item description. 3. SALIENT CHARACTERISTICS. 3.1 Design. The trailer shali consist essentially of a flatbed surface (body), 4-wheels in tandem with hydraulically operated mechanism that will lower and elevate the body through the wheel spindle center lines to facilitate loading and unloadin
5、g with not less than 12,000 lb (5 436 kg) capacity. The assembled trailer shall be equipped with electric brakes and a pull type tongue with lunette ring hitch. Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data which may improve this document should be sen
6、t to: Commanding Officer (Code 1581), Naval Construction Battalion Center, 1 O00 23 rd Avenue, Port Hueneme, CA 93 043 -43 O 1, by usmg the Standardization Document Improvement Proposal OD Form 1426) appearing at the end of this document or bv letter. AMSC NIA FSC 2330 DISTRIBUTION STATEMENT A. Appr
7、oved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50579 9999974 0174102 697 A-A-5 0579 3.2 Standard commercial product. The trailer shall, as a minim- be in accordance with the requirements of thi
8、s CID and shall be the manufacturers standard commercial product. Additional or better features which are not specifically prohibited by this CID but which are a part of the manufacturers standard commercial product, shall be included in the trailer being frnished. A standard commercial product is a
9、 product which has been sold or is being currently offered for sale on the commercial market through advertisements or manufacturers catalogs, or brochures, and represents the latest production model. 3.3 Performance. Trailer performance requirements, as specifled in 3.3.1 through 3.3.4.1, shaii be
10、met by trailer when hliy equipped, with payload distributed over trailer load area, completely serviced, and towed by a towing vehicle over improved and unimproved surfaces (see 7.3). 3.3.1 Towing speed and trailing ability. When transporting the rated payload, (see 3. i), while being towed over dry
11、, level, smooth, improved, and prepared hard-surfiiced roads at sustained speeds to 45 miles per hour (mph) (72 kilometre per hour (kmk), and over dry unimproved and gravel roads at speeds up to 10 mph (16 M), the trailer shall follow the towing vehicle without exceeding the tracking deviations as s
12、pecified in Federal Motor Carrier Safety 393.70. 3.3.2 Turning ability. When coupled to a towing vehicle operating in its minimum turning circle, the trailer shall follow without cramping. The trailer shall be capable of moving up to an angle of not less than 60 degrees in relation to the towing veh
13、icle without interference between vehicles. The angle shd be measured between the longitudinal axis of the trailer and the longitudinal axis of the towing vehicle at the coupling device. 3.3.3 Suspension system. The axles, mounts, accessories, and components of the suspension system shall withstand
14、the imposed loads without evidence of permanent set, part failure, or malfnctioning under the operating conditions specified. 3.3.4 Service brakes. The service brakes of the trailer, in conjunction with the towing vehicle (truck-trailer combination), under all conditions of loading, shail control, d
15、ecelerate, and stop the vehicle combination in accordance with Federal Motor Carrier Safety Regulation 393.52. The trailer shall be equipped with an automatically actuated device to apply the vehicle brakes upon breakaway from the towing vehicle. The breakaway system shall conform to Federal Motor C
16、arrier Safety Regulation 393.43. Wheel chocks shall be provided for each trailer. 3.4 Trailer comDonents. 3.4.1 Suspension. The trailer shail be equipped with an individual wheel suspension system having a rated capacity not less than the load imposed on each member, measured at the ground, with the
17、 vehicle loaded as specified in 3.1. When the suspension is rated at the spring pads, the unsprung weight shall be deducted. 3.4.2 Landing leg. The trailer shall be equipped with a retractable landing leg with cranking handle (rigid or swivel type) permanently installed. The landing leg shall have a
18、 vertical range of adjustment. The landing leg shaU permit the operator to lower the cargo body to ground level. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50579 9999974 0374303 523 A-A-50579 When the cargo body is in its maximum travel po
19、sition, the landing leg shall have sufcient vertical adjustment to permit the operator to couple the coupling device to the towing vehicle when the top of the pintle hook of the towing vehicle is 17.75 inches (45 1 milimetre (mm) above ground level. The landing leg and related parts shall withstand,
20、 without permanent deformation, the combined static and dynamic forces due to the proportionate weight of the gross weight and impacts during coupling and uncoupling operations. The landing leg shall operate freely, and shall be protected from malfunctoning by the accumulation of foreign matter. Whe
21、n placed in travel position, the landing leg shall remain positively locked to provide ground clearance in the course of normal towing operations. 3.4.3 Coupling device and towbar. The trailer shall be furnished with a 3-inch (76 mm) lunette ring. The hitch arm assembly shall permit the trailer body
22、 to be lowered to ground level and raised to hauling position without uncoupling the trailer fiom the towing vehicle. Safety chains shall be provided. Chains shall conform to Federal Motor Carrier Safety Regulation 393.70. When specified (see 7.2), the trailer tongue shall be designed to allow for a
23、djustment of lunette ring location for towing vehicle attachment between the range of 16 inches (406 mm) and 24 inches (610 mm) to top of ring with trailer in level position. 3.4.4 Load leveler. A load leveling system which maintains the trailer body in level position on the transverse plane while b
24、eing towed or raised, regardless of weight distribution on the cargo bed, shall be provided. 3.4.5 Trailer dimensions. Trailer dimensions shall be as specified in table I. TABLE I. Dimensions. I Feature I Dimension Overall length Overall width Body dimension Length (inside) Width (inside) Height (pl
25、atform to ground) Ground clearance Minllnum practicable Not greater than 96 inches (2 438 mm) Not less than 180 inches (4 572 mm) Not less than 60 inches (1 524 mm) Minimum practicable Maximum practicable 3.4.6 Wheels and tires. The wheel and tire ratiings shail conform to Tire and Rim Association r
26、ecommendations for the type and size of tires rnished. Tire and wheel sizes shall be the same for all wheels on the trailer. Tires shall be tubeless type with highway tread. 3.4.7 Spare wheel and tire. The trailer shall be provided with a spare wheel with an inflated spare tire, mounted on a tire ca
27、rrier. A carrier for the spare wheel and tire shall be provided and instailed in a readiiy accessible location. Means shall be provided for securing the tire to the carrier to prevent accidental loss. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
28、-A-A-50579 m 9999974 OL74LO4 4bT m A-A-50579 3.4.8 Tools. Each vehicle shall be furnished with tools r2quired for exchanging mounted tire assembly with spare tire assembly and shall include not IG s than a jack, jack handle, and wheelnut wrench. The jack shall be of such closed height as to pemit it
29、s location under an axle or other satisfactory lift point, at any wheel with tire flat. The jack without blocking, shall be capable of raising any wheel of the loaded vehicle to a height adequate to permit removal and replacement of the wheel and tire assembly. 3.4.9 Service brakes. The trailer shal
30、l be equipped with a 12-volt (V) direct current (dc), electric brake system wired in accordance with 3.4.11.3. The systems shali include a manual controller kit for mounting on the dash area of the towing vehicle, a controller kit for synchronizing the trailer electric brakes with the brakes of the
31、towing vehicle, and an emergency breakaway kit. Kits shall be complete with d necessary parts and installation instructions. Unless otherwise specified (see 7.2), the synchronizing controiler shall be for use with hydraulic brake system. 3.4.10 Parking brakes. Manually applied parking brakes shall b
32、e furnished. Parking brakes shall conform to Federal Motor Carrier Safety Regulation 393.41. When brake cables are used, the cables sha be corrosion-resistant steel. Provisions shall be made for slack adjustment. Lubrication fittings shall be provided. 3.4.11 Electrical system. The electrical system
33、 shd be 12V dc and all lights, reflectors, and Wiring shali conform to Federal Motor Carrier Safety Regulations 393.15,393.19,393.20, 393.22,393.23,393.25,393.26, and 393.27 through 393.33. 3.4.11.1 Electrical receptacle. A trailer electrical receptacle with a spring-loaded cover assembly shd be ins
34、tailed on the forward end of the drawbar. The receptacle shall conform to SAE 5560, with conductors connected and color-coded as specified in SAE 5560. 3.4.11.2 Brake wiring. Electric brakes shall be wired to the auxiliary circuit of the SAE 5560 seven-conductor electrical connector. Ali wiring shal
35、l be properly mounted and secured with clamps. Wiring shall be heavy-wail thermoplastic insulated cable. 3.4.1 1.3 Electrical cable. A coiled electrical cable conforming to SAE 51067, with a cable plug at each end conforming to SAE J560, shall be provided. Both plugs shd be equipped with a grip for
36、withdrawing Com the connector sockets. The cable, when fblly extended, shall be not less than 3 feet (914 mm) longer than the distance fiom the trailer electrical receptacle to the hitch assembly, 3.4.1 1.4 Turn signals. Turn signals conforming to SAE J558 shd be fiunished. 3.4.12 Body and fiame. Th
37、e trailer shall be equipped with a body and fiame of all steel welded construction. Body floor and side panels shaii be of adequate gage and construction so as to support trailer payload specified without evidence of deformation or permanent set. Tiedown devices shall be welded to the cargo body and
38、 located near the center of each side and at each corner. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50579 W 9999974 0374305 3Tb W A-A-50579 3.4.12.1 Tailgate. A tailgate shall be hmished. The tailgate shall be hinged at the floor level of
39、 the cargo body. The inside surface of the tailgate shall be covered with safety steel tread plate. The tailgate shall accept a roiling load equal to the specified payload without evidence of deformation or permanent set. The tailgate shall be so constructed that the approach ramp shall be not more
40、than 0.375-inch (9.5 mm) above the ground surface. The tailgate shall be provided with a latch to hold in an upright or closed position. 3.4.12.2 Body mounting. The body (bed) shall be mounted in accordance with manufacturers standard commercial practice. 3.4.12.3 Fenders. The vehicle shall have fen
41、ders over the wheels. The fenders shall have inside shields and shall have sufcient crown to control mud and water fiom splashing on the chassis and trailer bed. 3.4.12.4 Suspension system. The axles, accessories, and components of the suspension system shall exhibit capacity to withstand the impose
42、d loads without evidence of overload, permanent set, part failure, or malfunction when the trailer is subjected to the loading and operation conditions specified herein. 3.4.13 Hydraulic lift unit. The trailer shall be provided with a 12Vdc, electrically operated pump hydraulic lift unit. The hydrau
43、lic lift unit shall be capable of lowering the body to ground level and raiSig the cargo body not less than 52 inches (1 321 mm) with rated payload. The hydraulic lift unit shall elevate the cargo body, with rated payload, from ground level to travel position in not more than 35 seconds. Guards shal
44、l be provided to retain the body in travel position. Guards shall be provided to prevent damage to the hydraulic system. The hydraulic pump shall be provided with a built-in reservoir and shall be completely sealed to prevent dirt fkom entering the system. The hydraulic cyiinder system shall be prov
45、ided with external seals to wipe plungers and to clean and keep out foreign matter. 3.5 Treatment and minting. Painting and preparation shall be in accordance with manufacturers standard practice. Color shall be gloss white conforming to FED-STD-595. 3.5.1 Instruction plates. The trailer shall be eq
46、uipped with instruction plates suitably located, describing any special or important procedures to be followed in operating and servicing the equipment. Plates shall be made of a material which will last and remain legible for the life of the equipment. Plates shall be securely secured to the equipm
47、ent with nonferrous screws or bolts of not less than O. 125-inch (3.175 mm) diameter. 3.5.2 Identification marking. Identication shall be permanently and legibly marked du-ectly on the trailer or on a corrosion-resisting metal plate securely attached to the trailer at the source of manufacturer. Ide
48、ntification shall include the manufacturers model and serial number, name and trademark to be readily identifiable to the manufacturer. 3.6 Lubrication. Means for lubrication shall be in accordance with the manufacturers standard practice. The lubrication points shall be easily visible and accessibl
49、e. Hydraulic lubrication 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50579 D 9999974 0174106 232 = A-A-50579 fittings shall be in accordance with SAE 5534. Where use of high-pressure lubricating equipment, 1,000 pound-force per square inch (psi) (6 894 kilopascals Pa) or higher, wiil damage grease seals or other parts, a suitable warning shali be &ed to the equipment in a conspicuous location. 3.7 Servi
