1、MIL-T-4744B 23 7797706 0183548 2 _ /- , AND TRUCK, CARGO 1. SCOPE 1.1 This specification covers two types of 6 X 4, hydraulic high-lift body, 37,000 GVd, g-ton capacity cargo trucks, designated Tw MC-1 and AF/S32H-l. 1.2 CLASSIFICAT1OM.- Trucks shall be of the following Srpes, Type MC-1 - Without wh
2、terization kit AF/S32H-1 - With winterization kit as specified (see 6.2): 2. APPLICABU DOCAWTS 2.1 The following documents, of the issue in effect on date of invitation for bids, fonn a part of this specification: SPECIFICATIONS Federal MM-b736 TT-T-636 Military MIL-G490 Lumber and Timber; Hardwood
3、Priiuer Coating, Synthetic, Wood and Ferrous Metal Wo od-.Preser vat ive, Water -Iiepe llant Trucks; Gasoline or Diesel Engine, Four Wheels-Two Rear Wheel Drive, G.V.W. 15, Pounds and Over Cleaning and Preparation of Ferrous and Zinc Coated Surfaces for Organic Protective Coatings Plate, Identificat
4、ion and Plate, Iden tif ication, Transportation-Data Packaging of Truck Chassis, Motorized, for Overseas Shipment Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Ordnance Corps ?nu78 Bir Force 54H6122 Fittings, Lubrication (Hydraulic) Tarpaulkis, Veh
5、icle, General SpecYTIcation for Envbruiiental Testing, Ground Support Equipnent, General Specification for Drawings anc Data Lists: Manufacturers 8 (For Product ion Aeronautical and Associated Equlpment) Hydraulic Fluid, Petroleum Base, Aircraft and Ordnance Enamel, Glose, Awrart Application Mobisty
6、 Requirewnts, Ground. Swport EquIpnient, Qeneral Specificatisn for Suppression, Radio Interference Genera Requirements for Vehicles (And Vehicular Subassemblies ) Metal Conditioner and Rust Remover (Phosphoric Acid Base) Grease, Autoraot ive and Artillery Refleotors, Indicating, Clearance Preparatio
7、n of Colors Marking for Shipment and Storage Identiicatbn Marking of U. S. Military Metals, Derhittan of Dissimilar Batterg, Storage, Waterproof for Tactica Vehicles WaPeAY Pintle Assembly, Heavy-Duty (Non-Quick Release Type) Winterization Conponents, Cornniercia Standardized, Air Force Vehicles 2 .
8、I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,VIL-T-Lt7LtLtB 23 m 7777706 OLA3550 O m MIL-T=4744B( USAF) PUBLICAT ION Air For ce-Navy Aeronautical Bulle tln i43 Specifications and Standards; Use of (Copies of documents required by contractors 11
9、i connection with specific procurement functiolis should be obtained from the procuring activity or as directed by the contractbg officer.) 2.2 OTHER PUBLICATIONS.- The following document forms a pad of this specification. Unless otherwise indicated, the issue in effect on date of invitation for bid
10、s shallapplye Society of Automotive Engineers SAE Hanibook, Class A, Type I (Application for copies of SAE publications should be addressed to the Society of Automotive Engineers, L85 Lexington Avenue, New York 17, New York.) 3. REQJI-TS 3.1 PFEPRODUCT1ON.- This specification makes provisions for 3.
11、2 coFipomN?!s 3.2.1 VPE MC-1.- The Type MC-1 truck shall consist of the Item See preproduction testing . following major components: No. Quantity Description Requirement 1 1 ea Chassis and cab 3 07 2 1 ea Engine 3.8 3 1 ea Electrical system 3 .9 4 la High-lift mecha- 3.10 5 1 ea High-lif t body 3.11
12、 nism 3.2.2 AF/S32H-l.- The AF/S32H-1 truck shall consist of the components specified in 3.2.1 and a winterization kit. 3.3 SELECTION OF SPECIFICATIOIJS AND STANDARDS .- Specifications and standards for necessary comodities and services not specified herein shall be selected in accordance with Bulle
13、tin l.43 except as provided in 3.3.1 and 3.3.2. 3.3.1 COMMERCIAL PfiRTS.- Commercial parts having suitable properties may be used where, on the dateof invitation for bids, 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-there are no suitable standa
14、rd garts. ,In any case, commercial utility parts, such as screws, bolts, nuts, and cotter pins, having suitable properties my be used provided: without alteration. enced in the parts list and, if practical, on the contractors drawhgs. standard parts shall be used where they suit the purpose. be iden
15、tified on the drawings by their part numbers. a. They can be replaced by the standard parts (IS or AN) The corresponding standard part numbers are refer- . 3.3.2 STANDARD PARTS With the exceptions in 3.3*1, Ms and AN b, They shall 3.4 PIATEEZIAIS 3.4.1 DISSIMILAR ME;TAIS.- Insofar as practicable, th
16、e we of dissimilar mtals in contact which tend toward electrolytic corrosion (particularly brass, copper, or steel in contact with aluminum or aluminum alloy) shall be avoided, However, metal plating OF metal spraying of dissimilar base metals to provide similar or suitable abutting surfaces shall b
17、e permitted. separated by suitable insulating material shaU. also be permitted. Dissimilar metais are defined in MS33586, The use of dissimilar nietas 3.4.2 PROTCTIVE TREAmNT.- When materials are used in the construction of the truck that are subject to deterioration when exposed to climatic and env
18、ironmental conditions likely to occur during service usage, they shall be protected against such deteriora- tion in a manner that will in no way prevent canpliance with the performance requirements of this specification. le use of any protective coating that kill crack, chip, or scale with age or ex
19、tremes of climatic and environmental conditions shallbe avoided. 3.5 DESIGN AND C0NSTRUCTON.- fie truck shall be designed and constructed so that no parts will work loose in service, It shall be built to withstand the strains, jars, vikratians, and other con- ditions incident to shigping, storage, a
20、nd service. structed that adjustments and repairs can be easily made with a minimum use of specia tools. the vertical plane which bisects the truck longitudinally, with a tolerance of 3 inches on either side of the plane. 3.1 ADJITSTPIENTS AND REPAIFIS.- The truck sha be so con- 3.5.2 CENTHL OF GRAV
21、TY.- The center of gravity shall lie in 3.5.3 WHEEL L0.4DINGS.- With the truck loaded to rated capacity, the front-axle load shall not exceed 10,000 pounds and the load on any rear wheel shall be equal, within 5- percent, to the smallest rear- vheel load6 - -J - ._ - I_.- - - - -_I _ Provided by IHS
22、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-q74qB 23 M 7777706 0283552 4 m I MILT-474( USAF) 3.5.4 ROAD CLZARP,NCE.- When loaded, the road clearance of %he truck shall be not less than 9-1/2 inches. 3.6 PERFORMANCE 3.6.1 ENVIRCNMENTAL CONDITIONS.- The tmc
23、k shall be capable of wiibtanding the following conditions without detrimental effect to subsequent operation: a. Type MC-1 - Teniperatures raging frcm -20 F without benefit of sol= radiation up to +12s0 F even though exposed to maxim solar miation. bo Type AF/S32H-1 - Temperatures ranging frm -65“
24、F without benefit of solar radiation up to +125O F even though exposed to maxinaim solar radiation. 3.603 ROAD PERFORMANCE.- When uniformly loaded to rated capaciw and with the truck bed in the lowered position, the truck skll be capable of satisfactory operation over unimproved roads (see 6.3.1) at
25、 an ovemge speed of 20 mph and over improved roads (see 6.3.2) at an average speed of 35 mph. The truck shall be capable of reaching a maximm speed of at least 45 mph. 3.7 CHASSIS AND CAB.- The chassis and cab slxll conform ta KKK-T-701 except as specified herein. 3.7.1 GEXJEML.= The chassis shall b
26、e 6-wheel, 4-rear-wheel 3.7.2 I?FW.IE.- The height of the chassis frame shall not exceed drive, steered by the two front wheels. the value necessary to provide the lowered truck-bed height specified in 3.11.2. The frme shall be constructed to withstand the severe concentrated loadings imposed by the
27、 high-lift mechmism. 3.7.3 CAB-TO-AXLE DIviENSION.- The cab-to-de dimension shall be not less than 96 nor more than 108 inches. 3.7.1i FUEL TANK.- The fuel tank shall kve a minimum capacity of 30 U. S. gallons and shall be of the manufacturers stanclard design. 3.7.5 TRANSIVIESION SPEEDS 00 psi, The
28、 lift mechanism shall lift the truck bed in essentially a vertical direction and shall be capable of performing all required operations with the truck engine running. 3.10.1 HYDRAULIC SSTEM.0 The number and type of hydraulic cylinders shall be determined by th manufcturer. be of the single, multiple
29、 telescoping, or other special design. All seals, rings, gaskets, et cetera, shall be designed for ease of removal and replacement. protected. Metal, nonflexing hydraulic lines shall be used where flexing is not required during operation. Armored or otlieruise protected flexible hose shall be used w
30、here flexing is required. Frovisions shall be made for bleeding the sgstem at all necessary Cylinders may Pistons shall be covered or otherwise points, 3.lOJ.l HYDRAULIC TANK The hydraulic tank shall have a capacity of not less than 110 percent of the fluid required far operation of the hydraulic sy
31、stem. vided in the tank to prevent excessive surging of the hydr2uU.c fluid. a filler neck which shall be so designed and located that the hydrmlic tank can be filled without the use of axiliarg equipment when the cargo body is in the lowered position. shall be provided with an air vent. that will f
32、ilter the hydraulic fluid being added to the tank and on each cycle. purposes. hydraulic fluid conforming to MIL-H-5606. distributed over the truck bed, the high-lift mechanism shall be capable of Ufting the losd from the lowest position specified in 3.11.2 to a vertical height of i3 feet above the
33、ground. Internal baffles shall be pro- The tank shall incorporate a drain plug in the bottom and The filler cap 3.10.1.1.1 HYDHAULIC FUJID FILTER.- A filter shall be provided The filter shall be easily accessible for maintenance 3.10,10? HYDRAULIC FLUID.- The hydraulic system shall use 3.10.2 SIFT C
34、APACEYO- With a lozd of 18,000 pounds uniformly 3.10.2.1 OPERATING SPEZIS.- When operated under the load specified in 3.10.2, the lifting and lowering speeds shall be infi- nitely variable between O and a maximum of 10 fpm. speeds specified herein are those required at an ambient temperature of 75“
35、do F. The operating Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-Ll7LlLlB 23 9779906 0183556 1 M /- y 3.10.2.2 UNBALANCD LOAD.= With a 9,O-pound load located in any quarter (see 6.3.3) of the truck bed, the higblift mechanism shaU. be capab
36、le of raising tk load without binding or other meckni- cal irmgularity* 3.X.2.3 NOML SLIP.- With hydraulic pressum applied, the rate of slip measured at the hydraxlic pistons shall not exceed 0,125 inch in 2 hours when the tmck bed is in the extreme raised position and loaded with an 18,OoO-pOund lo
37、ad. 3.10.3 S“Y DEVICES.- The following shall be provided: a. A safety device to prevent sudden lowering of the tmck bed when hydraulic pressure is accidentally cut off through failure of the engine, pump, or other hydraulic components. b. 1, safety device to insure that the power takeoff is not enga
38、ged when the truck is in motion. C. .A manually operated positive locking the lift mechanism in the extreme raised position for purposes. device to hold niaint enanc e d. Positive stops to retain the Uft mchanism within the extremes of its required travel. 3.10.1i COIJTR0LS.- Paising, loweizing, ari
39、d stopping the lift mechanism shall be regulated by one set of controls located outside the cab 5nmBdiately to the rear of the drivers side and readily accessible to an operator standing on the ground. The controls shall provide infinitzly .variable lifting and lotrering speeds between the limits sp
40、ecified in 3.10.2.1 and, upon release of applied force by the operator, shall stop and hold the tnick bed at any point within thg lifting and lowering ranges. The controls shall be so designed that, after engaging th power takeoff, one operator can nin the lift mechanism through at least two raisirl
41、g-ai-liing cycles without leaving the outside control location. The number of control bvem or switches shall be limited to two and shall be of the deadman type requiring continuous application of pressure. 3.10.5 STABILITY.- Whether the tmck is unloaded ar under rated load, the lift mechanism shall
42、be stable and rigid throughout tb 9 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-LiiLtLtB 23 799790b 0183557 3 lift range. The floor shall not tilt mre than so (measured in any direction from the horizontal plaile) when a 9,000-pound load
43、is imposed in any quarter of tb bed. The bed and lift mechanism combinedshallnot deflect more than 2 inches in relation to the chassis frame when a 9,bpound load b placed on a front or rear quarter of the bedo 3.10.6 LUBRICATICES.- The lift mechanism shall have a high- pressum lubrication system uti
44、lizing fittings conforming to MIhF-3S41 and gmase conforming to MIL4-10924. 3.U HIGH-LIFT BOY.- The higblift body inside the stakes shall be i3 feet e inches long and a minimum of 88 inches wide. The body shall be equipped with removable stake sides arid front, a tailgate, and a bowed tarpaulin cove
45、r. d step shall be provided on the mar side of the body to aid personnel in climbing into the rear of the truck bed at lowered Level. 3.ii.l TRUCK RED.- The bed of tb high-Xft body shall present a flat, unobstructed, horizontal surface when the front and sides steel-tread plate having a minimum thic
46、kness. of No. 10 mfrts gage (0.1345 inch). The floor shall be securely attached to the support bg members. are removed and the tailgate is lowered. Flooring shall be of v- 3.11.2 TRUCK-BED HEIGHT IN THE LOWEFED PBIT.1ON.m A 48 inch bed height with the unloaded cargo body in tk lowered position shall
47、 be a design objective. The maximum acceptable bed height under these ctmditions shall be 52 inches* The clearance between the underside of the body and the tires shall. be not less tlian 1 inch under tf-e conditions specified ln 4.4.6. 3.ll.3 FRONT AND SDE STPXE ASSFiMBLlES.- The front and side sta
48、ke assemblies of the truck bed shaU be of the past-and-slst type construction. The assemblies shall be 4 feet high as measured from the top of the truck bed. The front assembly shall be a single unit. The side assembly shall consist of three sections approxhately equal in length. assemblies. Hardwoo
49、d or metal shall be used throughout the Hardwood skall be in accordance with MM-L-736. 3.u.h TAILGATE.- The tailgate shall be centered with respect to the truck bed, shall not exceed 88 hches in width, and shall be 30 inches in height. Tailgate chains supported by the side stake assemblies shall be furnished to support the tailgate in a horizontal position. The tailgate shall be so designed that it may be lowered to a ve
