1、flIL-T-6249LC 23 m 9999906 0509843 3 m NOT MESASUREMENT SENSITIVE MIL-T-62491C - SUPERSEDING MIL-T-62491B 2G Octoher 1989 , MILITARY SPECIFICATION TRUCKS, WRECKER: 4540 TO 40 820 KIMGRAMS MODIFIED COMMERCIAL (5-TON TO 45-TON) LIFTING CAPACITY, This specification is approved for use by all Department
2、s and Agencies of the Department of Defense. 1. SCOPE 1.1 m. This specification covers all commercial, non-tactical wreckers procured for military use. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents. . 1.2
3、 ! distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-6249LC 23 = 7999706 0507844 5 MI L-T-6249 1C .* TABLE I. Jlehicle cl-catinn. Type Class Size Model I - Hydraulic 10 5T 4x2 or 4x4 10 7T 4x2 or 4x4 28 20T 4x2 or 4x4 3
4、2 25T 4x2 or 4x4 39.5 35T 6x4 or 6x6 39.5 40T 6x4 or 6x6 50 45T 6x4 or 6x6 II - Mechanical 21 16T 4x2 24 24T 4x2 or 4x4 32 24T 4x2 or 4x4 34.5 24T 6x4 36 24T 6x6 44.5 24T 6x4 or 6x6 1 1.2.1 (=llass. The class of the vehicle shall be determined by the minimum GVW rating, as shown in table II: Table I
5、I. Yehide c1ww.s. - Class GVW kilograms (kg) (pounds) 10 4550 ( 10,000 ) 21 9530 (21,000) 24 10 900 (24,000) 28 12 700 (28,000) 14 500 (32,000) 32 34.5 15 650 (34,500) 36 16 350 (36,000) 39.5 17 900 (39,500) 44.5 20 200 (44,500) 50 22 700 (50,000) 1.2.2 Size. The size of the vehicle shall be determi
6、ned by the minimum lifting capacity of the wrecker boom( SI, as shown in table III: Table III. Ucle siW. kg (pounds) 4540 ( 10,000) 6350 (14,000) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-6249LC 23 a 999930b 0509845 7 W Model 4x2 4x4 6x
7、4 6x6 ,. c Wheels Wheels driving 4 2 4 4 6 4 6 6 %- MIL-T-6249 1C Table III. l!overrimsntdocuments. . The following * 2.1.1 SmcSinatiQm. steds. specifications, standards and handbooks form a part of this document to the extent specified herein. documents are those listed in the issue of the Departme
8、nt of Defense Index of Specifications and Standards (DODISS), and supplement thereto, cited in the solicitation (see 6.2)- SPECIFICATIONS Unless otherwise specified, the issues of these FEDERAL W-B-131 - Battery, Storage: Vehicular, Ignition, W-F-800 - Fuel Oil, Diesel. Lighting and Starting. MILITA
9、RY MIL-P-5 14 - Plates, Identification, Instruction and Marking, Blank. MIL-T-5624 - Turbine Fuel, Aviation, Grades JP-4 and JP-5 - 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-6249LC 23 9999906 0509846 9 E MIL-T-6249lC MIL-M-43719 - Mark
10、ing Materials and Markers, Adhesive, Elastomeric, Pigmented, General Specification for. Weather, Operational and Preservative. JP-8. Hydrocarbon Base, Aircraft, NATO Code Number MIL-B-46176 - Brake Fluid, Silicone, Automotive All MIL-T-83133 - Turbine Fuel, Aviation, Kerosene Type, Grade MIL-H-83282
11、 - Hydraulic Fluid, Fire-Resistant, Synthetic H-537 - STANDARDS FEDERAL FED-STD-297 - Rustproofing of Commercial (Non-tactical) Vehicles. MILITARY MIL-STD-1223 - Non-tactical Wheeled Vehicles Treatment, Painting, Identification Marking and Data Plate Standards - Capacity, Manual Release. MS 51118 -
12、Pintle Assembly, Towing - 40,000 Lbs. MS 51317 - Light, Warning, Vehicular, Rotating, D.C. MS 51335 MS 75020 - Connector, Plug, Electrical - 12 Contact, MS 75021 - Connector, Receptacle, Electrical - 12 - Pintle Assembly, Towing - 18,000 Lbs. Capacity, Manual Release. Intervehicular, 28-Volt, Waterp
13、roof- Contact, Intervehicular, 28-Volt, Waterproof. * specifications, standards, and handbooks are available from the Naval Publications and Forms Center, Military Specifications and Standards, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) (Unless otherwise indicated, copies of federal
14、 and military 2. i. 2 nther! the body; and a full complement of fuel, lubricants and coolant- The curb weight on the front axle shall be adequate to produce the wrecker lift-tow load a8 specified herein. A chassis exceeding the minimums specified herein (axle, suspension and tire capacities; engine
15、size; cab type; hood projection; cab and hood materials; chassis source selection; and any other functional, weight-adding options) shall be furnished as needed to enable the wrecker to comply with the lift-tow load specified. * 3.2.5 Grow, vehicle wei or an equalizing pump shall be used to maintain
16、 the same fue1 level in both tanks. Except for class i0 wreckers, fuel tanks shall not extend beyond the rear of the cab. * 3.4.3.3 lue1 and water se-mmtor. The manufacturers standard or optional fuel filter shall be provided. water separator shall be furnished. The separator shall include a water c
17、oalescer and a drain valve. filter/separator unit may be furnished. When specified (see 6.2), a fuel and - c When a separator is required, a combination s 3.4.4 Exhaust svstem. The exhaust system shall conform to Federal Motor Carrier Safety Regulation 393.83. Vertical exhaust mufflers, if furnished
18、 and if capable of being reached easily by personnel entering or leaving either side of the cab, shall be furnished with a heat shield. Vertical exhaust systems, if furnished, shall be provided with a hinged rain cap. * 3.4.4.1 LPn shall be provided with an automatic transmission. of the transmissio
19、n shall be at least equal to the maximum torque delivered by the engine. The transmission shall include a hydraulic torque converter and not less than three forward speeds for class 10, and four forward speeds for all other classes, except model 6x4 and 6x6 shall have five forward speeds. Horma1 dri
20、ving range selector position, except for class 10, shall provide not less than four gear ratios without movement of the selector. Except for class 10, the transmission shall be provided with a power takeoff opening. The clutch lining The clutch on model 6x4 and 6x6 shall have spring The input torque
21、 capacity 3.4.5.4 Transfer case. Model 4x4 and 6x6 vehicles shall be provided with a transfer case. which compensate for differential torque and speeds between the front and rear axles, the transfer case shall provide for drives selection of either two-wheel or four-wheel drive for model 4x4 or eith
22、er four-wheel or six-wheel drive for model 6x6. When furnished, inter-axle compensating devices shall provide for positive transfer of power to all driving ales- Unless otherwise specified, either a one- or two-speed transfer case may be furnished. When specified (see 6.2), a two-speed transfer case
23、 ahall. be furnished. When a two-speed transfer case is furnished, the speedometer shall read accurate speed h/h (mph) with the speed selector in high or low range - Unless the transfer case is equipped with devices 3.4.5.5 lber takafi. A transmission or transfer case mounted power takeoff shall be
24、provided, except on class %O vehicles with an automatic transmission. The power takeoff shall be of a rated capacity to operate powered equipment. the truck cab accessible to the seated driver. A caution plate OF decal Controls to opesate the power takeoff shall be located in 20 L Q Provided by IHSN
25、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-bZ491C 23 9999906 0.509863 9 = MIL-T-62491C reading “Do NOT OPERATE VEHICLE AT HIGHWAY SPEEDS WITH POWER TAKEOFF ENGAGED“ shall be installed so as to be readily visible to the seated driver (see 3.1.1.13). shaft
26、power takeoff or an engine driven hydraulic system with an electric, asbestos free, clutch shall be provided. For class 10 vehicle8 with an automatic transmission, a split 3.4.6 Qriveliw . Driveline components shall be adequate to transmit the maximum delivered torque of the engine, as developed thr
27、ough the maximum gear train reduction. f 3.4.7 Frame. The truck frame reinforcement or heavy duty frame shall be in accordance with the wrecker body manufacturers recommendation for the size of wrecker unit furnished. Chassis frame rails shall not project beyond the rear end of the body. For all but
28、 class 10 wreckers, the chassis shall have a heavy duty main frame or frame with reinforcement extending at least from the rear of the front suspension rear hanger bracket to the bogie trunnion mounting bracket. The heavy duty frame shall have frame rails of greater section modulus than the manufact
29、urers standard for the class of vehicle furnished and shall provide structural strength at least equivalent to the reinforced frame specified herein. Reinforcement shall provide sufficient structural strength in the chassis frame through increased resisting bending moment, to at least equal the load
30、s imposed with the vehicle loaded to the most severe loading configuration allowed by table X, - ., s - - XII or XIII. 3-4.8 Sua- . The vehicle shall be equipped with a suspension system with components having a rated capacity at least equal to that specified in 3.2.5. unsprung weight shall be deduc
31、ted. When spring capacity is rated at the spring pads, f 3.4.9 m. Axle ratings shall be at least equal to that specified in 3.2-5. model 4x4 and 6x6 shall have oil lubricated wheel bearings and axle spindles- Provisions for venting or withstanding pressure buildup and for replenishing the oil supply
32、 shall be provided. The front and rear axles on model 4x2 and 6x4 and the rear axles on 3.4.9.1 . The rear bogie on model 6x4 and model 6x6 vehicles shall be of the four-wheel type, complete with axles, springs, torque rods, and a11 other necessary parts. The bogie shall be provided with means permi
33、tting differential action between the two axles and a manually or automatically controlled lockout assuring equal power to each rear axle. manual lockout control shall be located in the truck cab. The axle gear ratios shall provide the performance specified in 3.3 through 3.3.1.3. The 3.4.9.2 Two -
34、-meed axles . When specified for model 4x2 or 6x4 (see 6.2), a two-speed axle shall be furnished, equipped with electric, vacuum, or air shi?t and provided with ratios which will permit proper gear splitting. gear ratios shall provide the performance specified in 3.3 through 3.3.1.3. The 21 Provided
35、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-bZ49LC 23 9999906 05098b4 O MIL-T-62491C 3.4.9.3 Qaction con . When specified (see 6.2), the vehicle be furnished with traction control on the rear axle (either rear axle model 6x4 and 6x6). The traction
36、control shall actuate automatically insure that power.is transmitted to the wheel having traction when the opposite wheel loses traction. Maximum traction capabilities shall be maintained at al1 times under each drive wheel for the life of the vehicle. shall for to * 3.4.10 bels. rb. tires and tuba
37、- Unless wide base tires are specified, the vehicle shall be equipped with single front and dual rear wheels. Except as specified herein, rims and tire ratings shall conform to Tire and Rim Association or European Tyre and Rim Technical Organisation recommendations for the type and size of tires fur
38、nished. Except when tube type tires are specified in acquisition documents, multi-piece rims shall not Lie furnished on front axles rated at 6350 kg (14,000 pounds) or less and on rear axles rated at 10 430 kg (23,000 pounds) or less. Rims and dise: wheel sizes shall be the same for all wheels on ea
39、ch vehicle, except for class 50. Tire size and load range (ply rating) shall be the same for all tires on the vehicle, except for class 50. When specified (see 6.2), wide base type tires and wheels for the front and rear axles shall be provided in lieu of cmnventional front and dual rear wheels and
40、tires. Wide base wheels shall be interchangeable without the use of an adapter. disc type wheels shall be furnished. When specified (see 6.2), * 3.4.10.1 Tires. Tires shall be steel belted radial or, when specified (see 6-21, bias ply. Unless otherwise specified, low profile or standard profile tire
41、s may be furnished. When specified (see 6.2), low profile tires shall be furnished. Tires shall be tubeless type with highway tread for model 4x2 and 6x4 and with nondirectional mud and snow tread for model 4x4 and 6x6 vehicles. Tires shall be of rated capacity at least equal to that specified in 3.
42、2.5. Tires shall conform to Tire and Rim Association or to the European Tyre and Rim Technical Organisation r-ecommendations. 3.4.10.2 her tuhe. When tube type tires are specified in acquisition documents, inner tubes shall be of the heavy duty.type, and shall be of the proper size for the tires fur
43、nished. radial tire inner tubes. Tire flaps shall be provided for tube type tires in accordance with Tire and Rim Association recommendations. Tube type radial tires shall have 3.4.10.3 Carrier for mare tire 3- . A spare tire carrier shall be inutalled in a readily accessible location on the wrecker
44、. Threaded fasteners, when used to secure a spare tire in the carrier, shall be constructed of or plated with corrosion-resistant material. horizontal carrier may be furnished. carrier, the deck of the wrecker shall be free of safety obstacles. The carrier design shall enable removal or mounting of
45、the spare wheel assembly using only the tools specified in 3.4.17.1. safe removal and installation of the spare tire assembly from and to the vehicle and carrier without personnel positioning themselves or any gart of their body under the spare tire assembly. A vertical or With the spare removed fro
46、m the The carrier shall enable the 22 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i i 1 I I t , ! I I 1 I I t i MIL-T-b249lC 23 9999906 0509b5 2 MIL-T-6249 1C 3.4.10.4 Spare wheel or r im. When specified (see 6.2), a spare wheel or rim shall be f
47、urnished. 3.4.10.5), a spare wheel or rim shall be furnished; When a spare tire assembly is specified (see 3.4.10.5 Spare . When specified (see 6.2), a spare tire assembly shall be furnished. inflated spare tire mounted on the spare wheel or rim. be of the same size, tread design and load range (ply
48、 rating) as the tires furnished on the front axle of the vehicle. The spare tire assembly shall include an The spare tire shall 3.4.10.6 Tire chnin clear- . Tire chain clearance in accordance with CAE 5683 shall be provided. included - Allowance for spring deflection shall be 3.4.11 Brakes. Brakes s
49、hall conform to Federal Motor Carrier Safety The vehicle Regulations 393.40 through 393.43 and 393.45 through 393.52. shall be equipped with full air brakes, except that class 10 vehicles shall be furnished with power-assisted hydraulic brakes. Brakes shall be furnished on all wheels. Brake linings shall be of nonasbestos material on all front axles, on single rear axles rated at 10 430 kg (23,000 pounds) or less and on tandem rear axleu rated at 20 900 kg (
