1、Mil-C-5243C 18 Gct i933 Sy ersebin This specification is approved for use by all Departments and Agencies of the Departmkt of Defense. 1. SCOPE 1.1 Scope. This specification covers various sizes of single- and multi-axle The trailer chassis are compatible for towing cart-type trailer chassis having
2、a low-silhouette frame, suitable for skid-mounted operating equipment. behind trucks, both commercial and military design and for being hauled behind construction and industrial machinery (CIM) equipment. are compatible with a variety of operating machinery equipment, work tool sets, and shop sets w
3、hich supplement and assist other equipment on earthmoving, construction, and materials handling jobs. These trailer chassis 1.2 Classification. Trailer chassis shall be of the following sizes, as specified (see 6.2). Gross Vehicle Weight Rating (GVWR) as follows: The size of trailer shall be determi
4、ned by the minimum DOT Size 1, CCE - Min. 1400 lb. GWR, for light truck - MIL-C-52437/1 Size 3, CCE - Min. 3000 lb. GVWR, for light truck - MIL-C-52437/2 Size 4, CCE - Min. 4000 lb. GWR, for medium- truck - MIL-C-52437/3 Size 6, CCE - Min. 6500 lb. GWR, for medium truck - MIL-C-52437/4 Size 8, CCE -
5、 Min. 8000 lb. GVWR, for medium truck - MIL-C-52437/5 Size 9, MD - Ref. 8700 lb. GVW, for medium military design 2-1/2 B al k *rl 3 tr al k d al d 9rl m U al a rl (d 1 U O m k u E O O k O CFI U al cn 2 c, U m O .rl cci .rl o al a VI al N *rl w e m al d .rl !-I al rl ln m U al al VJ e h rl E O al O E
6、 al k al W al k k 3( O C.4 w I II ww d al N irl v3 - a e m 1 O$ g d O - -. . rl rlld 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b MIL-C-52Y37C 23 7977706 0398633 2 production methods and choice of design detail will produce equipment that com
7、ply with the requirements of this specification. be as specified in Section 4, and unless otherwise specified herein, all examinations and tests shall be conducted by the contractor subject to surveillance and approval by the Government (see 6.3). 6.21, the Government will conduct any or all of the
8、first article examination and tests, as specified (see 6.2). Examination and tests shall When specified (see 3.3 Dissimilar metals. All dissimilar metals throughout the trailer chassis shall be insulated from one another to preclude galvanic or electrolytic action. Insulation shall be by a coat of e
9、poxy,-chromate, or alkaline-resistant, mylar barrier, electrical tapes, alumastic compound, or other effective means that prevent direct contact. MIL-T-704. s Dissimilar metals are defined in MIL-STD-889 and 3.4 Material. Material shall be as specified herein and, for size 9 chassis as shown on the
10、drawings. Materials not specified shall be selected by the contractor as being compatible with the intended use in accordance with the engineering standards of the trailer and construction equipment industry and as set forth in the following industry standardization publications: Society of Automoti
11、ve Engineers (SAE). Truck Trailer Manufacturers As sociation (TIMA) The Maintenance Council - ATA (TMC-ATA). Tire and Rim As sociation (TRAI. Friction Materials Standards Institute (FSMI) . Industrial Fasteners Institute ( IFI). American Welding Society (AWS). Forging Idustry As sociation (FIA) Amer
12、ican Society for Testing and Materials (ASTM) American National Standards Institute (ANSI). Rubber products furnished shall be not more than two (2) years from date of cure of the rubber to date of acceptance of the trailer chassis by the Governement. Threaded parts shall be in accordance with SAE 5
13、370, SAE 5371, and Industrial Fasteners Institute S tandards. * 3.4.1 Material design criteria. The stresses in the load carrying members of the equipment, both as a plant jacked up for operation and as a trailer chassis prepared for road transport, shall not exceed 50 percent of the materials yield
14、 point (YP) strength under static conditions. the trailer chassis of the plant units shall be furnished. This analysis shall include calculations and diagrams for the following: 5 A calculated stress analysis of a. b. C. The gross vehicle weight rating (GVWR) load distribution diagram of each chassi
15、s, blocked and on wheels. The vertical shear diagram for the length of each chassis, blocked and on whee 1 s. The bending moment diagram for the length of each chassis, blocked and on wheels. 11 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C
16、-52437C 23 H 9799706 OL98634 4 MIL-C-52437C 3.4.2 Recovered materials. All equipment, components, and materials incorporated in the trailer chassis furnished by the contractor shall be new and fabricated using materials produced from recovered material to the maximum extent possible without j eopard
17、ixing the trailer chassis intended use (see 6.1) nie term “recovered materials“ shall mean materials which have been collected or recovered from solid waste and reprocessed to become a quality source of raw materials, as opposed to virgin raw materials. shall be interpreted to mean that the use of u
18、sed or the furnishing of rebuilt products is allowed under this specification. None of the above 3.4.3 Material deterioration prevention. The materials used in fabrication of the trailer shall be either inherently corrosion resistant and weatherproof or protected from the deteriorating effects of ex
19、posure to the elements. The contractor shall have a written material and material finishing method, utilizing state-o-tke-art technology, which identifies the specific material, material finish, or material treatment supplied on components and assemblies subject to weathering to provide protection a
20、gainst various forms of material deterioration in the trailers operating and storage environments specified herein. 3.5 Maintainability. Components of the trailer chassis shall be accessible . for servicing, repair, and replacement. Components shall be accomplished with mimimum disturbance to adjace
21、nt components. Whore incorrect installation of an item could cause malfunction of that item or of the system in which it is installed, an unsymmetrical mounting means shall be provided or the mating parts shall be doweled or matchmarked. maintenance provisions shall incorporate features insuring ope
22、rating clearances in accordance with CAE 5925, and facilitate maintenance and service operations. The trailer chassis shall be maintainable using only those common mechanics tools which are listed in the %echanics Persone1 Tool Inventory“ as defined and published by Study Group S-5, The Maintenance
23、Council - ATA. The trailer chassis Maintainability Index and Repairability Index, in accordance with SAE 5817, shall be computed and included in the manual. shall conform to SAE 5920. The adjustment and replacement of Ease of The manuals for the chassis 3.6 Transportability. The loaded trailer chass
24、is at GWR shall withstand impact forces encountered in vehicular, rail, marine, and air transport as specified herein without damage or permanent deformation. 3.6.1 Road transport. The trailer chassis shall comply with the over the road transport requirements in 3.7.2 and 3.7.3. highway semitrailer,
25、 the trailer chassis shall be acceptable as cargo for road transport in accordance with the ATA National Motor Freight Classification Rules. When secured and loaded on a 3.6.2 Rail transport. The trailer chassis shall withstand all forces encountered in rail transport service without damage or perma
26、nent deformation. The trailer chassis shall be loaded on a flatcar to comply with the requirements of the “Rules Governing the Loading of Commodities on Open Top Cars“ of the Association of American Railroads. When specified (see 6.2, T-41, the chassis shall be subjected to a railroad humping test a
27、s specified in 4.6,2.8, Except or coupling to a trailer train fifth wheel coupler stand, which is incompatible with the tow eye, the trailer chassis shall conform to the applicable portions of AAR specification M-931. 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without li
28、cense from IHS-,-,- MIL-C-52437C 23 m 9999906 0178635 b W- MIL-C-5 2437C 3.6.3 Marine transport. The trailer chassis shall withstand all forces encountered in overseas transport by marine ships as both inside the hull cargo and on-deck outside cargo. 3,6.4 Air transport. Unless otherwise specified h
29、erein, the trailer chassis and equipment shall be air transportable in C-5A aircra.ft as shown in figure 1 without requiring sectionalization. When and as specified (see 6.2, T-5), the equipment shall be sectionalized, as necessary, and the trailer chassis and its equipment shall be air transportabl
30、e in C-130 aircraft as shown in figure 2. Sectionalization of each equipment loaded trailer chassis shall be accomplished in not more than 4 hours and sectionalization shall be done without requiring cutting or welding. All sectionalized segments shall be equipped with their own * lifting and t iedo
31、wn attachments. 3.6.5 Lifting and tie down attachments. 3.6,5.1 Lifting attachments. Each trailer chassis and, if applicable, each sectionalization component shall be provided with lifting attachments conforming to MIL-STD-209. normal traveling or operating position. damage or permanent deformation
32、of the slings or of the exterior of the equipment. used as t iedown attachments when such attachments meet the requirments specified in 3.6.5.2. The attachments shall enable the equipment to.be lifted in its The attachments shall not result in Lifting attachments may also be No spreader bars are per
33、mitted. 3.6.5.2 Tiedown attachments. Each trailer chassis and, if applicable, each sectionalization component shall be provided with integral attachment conforming to MIL-STD-20 9. 3.7 Performance characteristics. The trailer chassis shall meet the transport performance characteristics specified her
34、ein under the following conditions: With the trailer lubricated and serviced (see 3.18 and 3.19). With the specified equipment payload or at GVWR. When towed by trucks or self-propelled equipment. a. b. c. With the operating equipment installed and the trailer chassis jacked to level operating posit
35、ion, the trailer chassis shall withstand plant operation for extended time periods of at least a year. *- 3.7.1 Towing compatibility. The trailer chassis shall be compatible for coupling, towing, maneuvering, spotting, and under all conditions specified herein, when towed by trucks, construction equ
36、ipment, and materials handling equipment, to include those specified below: - Trucks having 20-to 25-inch pintle height for towing trailers having up to 75 percent of the trucks VIN plate GVWR; 12 volt electrical - no air for b raking : 13 Provided by IHSNot for ResaleNo reproduction or networking p
37、ermitted without license from IHS-,-,-MIL-C-52437C 23 m 9999906 OlSBb3b m a iI) I w 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-52437C 23 9999906 0398637 T 1 Y- $ , t-g- 1 N i KIJZ- *C -5 2 4 3 7 C + c a E t L O E O o O O vi z W w I- O P
38、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-52437C i23 W 9999906 0398638 I I FED-STD-307 FED-STD-2 9 2 MIL-C-52437C - Trucks, Light, Com. 4 x 2, 3,000 to - Trucks, Light, Com. 4 x 4, 3,000 to 11,000 lb, GW. 11,000 lb. GW. - Trucks having pin
39、tle height per SAE J849 for towing trailers having up to 95 percent of the trucks VIN plate GWR; 12 volt electrical - with and without source of air for braking trailers: KU-T-2107 KKK-T-21 O8 NU-T-2109 MX-T- 2110 KIN-T-2111 - Trucks, Med., Comm. 4 x 2, 14,000 to - Trucks, Med., Comm. 4 x 2, 24,000
40、to - Trucks, Heavy, Comm. 6 x 4, 34,000 to - Trucks, Med., Com. 4 x 4, 14,000 to - Trucks, Heavy, Comm. 6 x 6, 36,000 to 21,000 lb. GVW. 32,000 lb. GW. 64,000 lb. GW. 34,000 lb. GW. 60,000 lb. GW. - For of f-road equipment prime movers, wheeled and crawler vehicles having drawbar pin height of at le
41、ast 26-inches per SAE J749; no electrical or air sources for lighting or braking. Based on the safe operation premise that any trailer should not be towed by a truck having a gross vehicle weight rating (GVWR) on the trucks VIN name plate less than 133 percent of the GmR on the cart trailers VIN nam
42、e plate, these trailers shall be required LO properly tow and perform as specified herein only behind those trucks which have a GWR exceeding the trailers GVWR by at least 25 percent: Where 133 percent x trailer GVWR f minimum truck GWR. When and as specified by the contracting activity (see 6.2, T-
43、6) , the trailer shall be matched to the users prime mover (truck/equipment) to insure complete, compatible , powered combination. chassis shall include the slow moving vehicle sign on the rear as specified in 3.9, For of f-road equipment useage, the trailer 3.7.2 Trailer chassis mobility. The trail
44、er chassis shall conform to the mobility characteristics specified herein when either traveling with the intended operating equipment payload, when known, or traveling with simulated payload equal to the trailer chassis GVWR on the VIN plate. operate without malfunction, damage, or permanent deforma
45、tion. chassis shall: The chassis shall The loaded a, b. c. Travel over smooth primary paved highways at minimum 50 mph speed. Travel over gravel and dirt surfaced secondary roads, haul roads, and trails up to a minimum 20 mph speed. Negotiate off-road terrain, grades, side slopes, mud, sand, and sno
46、w to and from operational sites. 16 Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-52437C 23 W 7777906 OL78b39 3 W d. e. f. g- h. k. 1. m. n. 0. MIL-C-52437C Negotiate hard bottom creek water crossings. Negotiate highway V-ditches without d
47、amage (standard FIWA Bureau of Public Roads type, 36-inches wide by 18-inches deep). Withstand immobilization and t ow-out operations. Provide the specified minimum of suspension articulation, as cited in each specification sheet, between all combinations of wheels, front-to- rear as well as diagona
48、l. Negotiate a chatter course to produce at least 2600 either upward or downward accelerations having a magnitude ranging between 3 to 6 gs to the center of the road wheel on the trailer chassis. Trail the prime mover without bottoming, weaving, or side sway. Permit turns up to a minimum angle of 60
49、 degrees from straight ahead to the right and to the left without interference or damage of truck or trailer. Withstand tractor maneuvering resulting in pivot turning of the running gear in place, both clockwise and counter-clockwise. Comply with DOT FMCSR o ff-tracking tolerance. Provide minimum braking performance in compliance with DOT FMVSS, DOT FMCSR, and the California Vehicle Code. Provide braking system in accor
