1、MIL-T-LIb797B 23 = 79999Ob 019370 7 H I Coal dump body 25 April 1984 SUPERSEDING . $1 L-T-4 6 7 9 7A ( AT) 23 October 1980 I d 1 MILITARY SPECIFICATION TRUCK, WITH HIGH LIFT DUMP MECHANISM: . * DDIP, CARGO AND STAKE BODY TYPES, DIESEL AND GASOLINE ENGINE DRIVEN, 24,000 GVW, 4x2, COMMERCIAL This spec
2、ificatio-h is approved for use by the US Army Tank-Automotive Command, Department of the Army, and is available for use by all Departments and Agrncies of the Department of Defehse. 1. SCOPE. 1.1 - Scope, This specification covers diesel and gasoline engine riven, four-wheel, two-rear-wheal drive, c
3、ommercial trucks with a high ift dump mechanisni. Tho truck ha6 a minimum grOSB vehicle weight (GVW) of 24,900 pounds or normal operating conditions, Vehicles procured iirider thi specificatiori are commercial items which shall be warranted by tlie manufacturer as specf ied in procurement documents
4、Ir 1.2 Claseification, Vehicles shall be of the types shown in table 1, ID pecified (soe 6.2). II III i Cargo dump body I ! Stake dump body j I - hnoficinl commente (rocommndation, additions, daletione) and any 1 purtiiieiit riata which may ba o use in improving this document should ; t)c addrosead
5、to: US Army Tank-Automotive Command, ATTN: DRSTA-GBS11, t Warron, MI b Linprovament Proposal (DD Form 1426) appearing at tha end of thia 48090, by using the gel-addraesod Standardization Document: I I document or by letter. THIS DOCUMENT CONTAINS 36 PAGES. Provided by IHSNot for ResaleNo reproductio
6、n or networking permitted without license from IHS-,-,-L MIL-T-Yb797B 23 m 7799906 OL737L 7 m 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2. 1.1 specifications, standards and handbooks. Unless otherwise specified, the following speclf ications, standarde, and handbooks of the issue listed in t
7、hat issue of the Department of Defense Index of Specifications and Standhrds (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein, SPECIFICATIONS FEDERAL W-B- 13 1 - Battery, Storage: Vehicular, ignition, Lighting and Starting. *. ZZ-T-38 1 .- Tires
8、, Pneumatic, Vehicular (Highway). MIL-H-46 17 O - Hydraulic Fluid, Ruet inhibited, Fire- MILITARY eeistant Synthetic Hydrocarbon Base. STANDARDS MILITARY * MIL-STD-1223 - Nontactical Wheeled Vehicles Treatment, Painting, Rustproofing, Identification Marking and Data Plate Standards. Capacity, Manual
9、 Release, MS5111R - Pintle Assembly, Towing: 40,000 Lbs. I 2.1.2 Other Government documents, drawings, and publications, lhe following other Govorntnant documente, drawinge, and publications form a part of this epecification to the extent specified herein, DEPARTMENT OF TRANSPORTATION (DOT) Federal
10、Motor Carrier Safety Regulfitione, Fedora1 Hotor Vehicle Safety Standards. (ApplicBtion for copie6 should be nddreoscd to tho,Department of rnnsportation, Faderel Highway Adminiatration, Washington, D.C, 2059 1 . ) ENVIRONMENTAL PROTECTION AGENCY (E, and shall ha installed on the rear of the vehicle
11、. The pintla shall be of tho rotating type conforming to MS51118 and ehall be installed on the chassie frame with reinforcemante to traiitifer pintla loade directly to tho chassis rails, The rearmoet portion of the pintle shall be forward, but not more than 4 inchee forward, of the rearmoat part of
12、the vehicle. Two trailer safety chain attuchment devicas, one sdjacent to each side of the pintle, ehall S Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-46797B 23 m 7799906 OL9B375 b m be provided. at least equal to the GVW of the truck furni
13、shed. The safety chain attachment devices shall be capable of accommodating a standard grab hook (4-9/16 inchee wide, 1-3/16 inches thick, 25/32 inch throat width) for a 5/8 inch chain, with ite conductor8 connected and color coded aB specified therein, shall be mounted in a readily acceesible locat
14、ion near the pintle, trailer brake control system shall conform to 3.4.11.2, Each attachment device shall provide an ultimate strength nie lighting receptacle, conforming to SAI3 5560 The 3,2 Genera$ design, 3.2,l Federal Motor Vehicle Safety Standards. .The vehicle and furnished acceseoriee shall c
15、omply with all Federal Motor Vehicle Safety Standarde in effect on the date of manufacture. * 3.2,2 Air pollution.contro1. The vehicle shall cdmply with EPA Regulatione -hverning Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines in effect on the date of manufacture. In a
16、ddition, vehclee desttned for California shall comply with State of California regulations governing air pollution control in effect on the date of manufacture. * 3a2a3 Sound level, The interior sound level shall conform to , Federal Motor Carrier gafety Regulation 393.94. sound level ehall conform
17、to EPA Noise Emission Standarde for Troneportation Equipment, Medium and Heavy Trucks. The vehicle exterior 3.2.4 Curb wei hta The curb weight shall include the weight of tho chaseie *th and ca all attachmente, acceesories, and equipment ; body; and a full complement of fuel, lubricants, and coolant
18、, 3,2.5 Croes vehicle weight, Oros8 vahicle weight (CW) shall consist of the curb weight, oparator (weight computed at 175 pounds), nnd P payload to provida,not lass then the specified GVW, 3,2,6 Weight distribution, The diutribution of the GW for tho purpose of astabliehing suepeneion, axle and tir
19、e capacities shall be datermined with,the payload uniformly distributed over the load area. 3,2,7 Ratin sa Vehicle ratinge ehell be the nufacturere publiohod rat ?-. nge Cornponant and vehicular retinge shall not be raiead to meet tha raquiramsnte of thie epecification. ara not available, verificati
20、on of ratinge muat be submitted to the engineering office of tha procuring activity. be 24,000 pounds. han published ratinge Minimum CVW rating shall 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-46777B 23 I 7777706 0395376 5 c 3,2,8 Overal
21、l width. The overall width of the vehicle exclusive of mirror, lights, reflectors and tires shall be not more than 96 * I inches * * 3,3 Perf ormance. 3,3.1 Speeds and gradeability, High and low speed requirements shall be met with truck loaded to specified GVW, 3.3.1,l iiigh speed gradeability. The
22、 vehicle shall ascend a continuous 1.0 percent $rade at 50 miles per hour (mph), Gradeability requirements shall be met with the main transmission in direct drive, and when multi-epeed axle is furnished, with the axle in high speed range, Gradeability shall be verified with calculations in accordanc
23、e with SAE 5688 (see 6*3). I= 3.3.1,2 Low speed. Low speed shall be calculated with the engine operating at not lese than 35 percent of recommended governed speed, and shall provide not more than the vehicle speed (mph) specified in table II for the corresponding number of available forward speeds.
24、,* TABLE II. .Low speed requirement, Number of Maximum low I 3. O * 3,3,1,3 Maximum eared speed, Maximum geared speed at engine ConEormance t.0 geared aped shall bo determinod by calculating in accordance with the following formula: governed speed + s all be not lass than 60 mph (minus 1 parcent) Ma
25、ximum pared sped (mph= Governed speed,(rpm) %trgoar reduction x tire factor (see 6,3) 3,3,2 Sarvicc brakes, Tha service brakes ehall control and hold vahicle, whon loaded to its epocified groritl vehicle weight, on a 30 percent grade, stopping distance requirements of Federal Motor Carrier Safety Re
26、gulation 393,52 under all conditions of loading up to specified GVW, Tho service brakae shall ritop the vahicle within the J Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-T-46797B 23 9999906 0398377 T 3.3.3 Subframe, hoist and body performance.
27、 * 3.3.3.1 Stability Stability shall be demonstrated with and without payloa;r;-The-body shall be stable and rig$d throughout the entire elevation, retraction and dumping of the hoist mechanism. fully elevated position, the body floor shall not deflect more than 1-1/2 inches, measured from the floor
28、,to the top of the subframe. vehicle in all elevated and dumping position8 shall show no evidence of any.tire departing from the ground. In the The * 3.3.3.2 .Lifting capacity. The rated lifting capacity of the hoist shell be not less than the sum of the weight of the body plus one and . - -. - one
29、half times the payload. * 3.3.3.2.1 Height. The hoist shall be capable of raising the body and payload from rest position to a minimum height of ten feet measured from the ground! to the body floor. *-. 3.3.3.3 Manual locking device. A manual locking device shall be provided to retain .the body and
30、hoist at a raised height of not less than 96 inches measured from ground level to the body-floor, * 3.3.3.4 Operating speeds. The hoist and body shall be capable of elevating and retracting with the payload at not less than 15 feet per minute (fpm) and not more than 20 fpm, wich the vehicle engine a
31、t idle- apeed, and when the load is imposed on the hydraulic system. The hydraulic fluid shall be stabiized at the ambient air temperature prior to the performance of the test. * 3.3.3.5 Position stability. When the vehicle is on level ground, the hoist hydraulic system shall hold the body with the
32、payload in any elevated position without more than a 1/8-inch vertical setting in,2 hours . * 3.3.3.6 Unbalanced load. With one quarter of the payload located in any corner of the body floor, the hoist shall be capable of raising and lowering the body without evidence of binding, deformation, or ben
33、ding of the hoist mechanism. 1-1/2 inches, as specified in 3.3.3.1, * 3.3.3.7 Wind resistance. The vehicle, both loaded and unloaded, and at the fully elevated position on a 3 percent sidegrade, shall be capable of withstanding 30 mph winds and wind gusts up to 50 mph from any direction without qver
34、turning and without permanent deformation of any component. perpendicular to the wind force, and shall be measured in accordance with the following: The body shall not deflect more than Wind load shall be calculated with the maximum side area . -*, i1 L . Provided by IHSNot for ResaleNo reproduction
35、 or networking permitted without license from IHS-,-,- MIL-T-4b777B 23 7979706 OL7B378 L MIL-T-46797B(AT) I 1 (a) at the body, when the body is fully retracted (b) at the body and hoisting.mechanism, when the body is elevated to its maximum specified height, in the most critical position, , that wou
36、ld induce tipping. In bath (a) and (b), the resistant moment shall be greater than the wind load. report forthe vehicle or an identical vehicle to the engineering off ices of the procuring activity. The contractor shall furnish calculations or a -certified test Ji 3,3.3.8 Stress analysis, A stress a
37、nalysis of the vehicle body and fraine shall be furnished as specified in 3.8. 3,4 Chassis components. 3.4.1 En ine The engine furnished shall be the chassis manufacturer s etandard or optional engine for the commercial model truck which meets or exceeds the requirements of this specification. Ji 3.
38、4# i, 1 Diesel. engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be equipped with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel engine, with not less than four cylinders, Engine net horsepower figures used in performance prediction calculations shal
39、l be determined in accordance with SAE 5816 or SAE 51349, A fen clutch to reduce fan speed autornatically,.when not required for engine cooling, shall be provided. . Ji 3.4.1 . 2 Gasoline engine . Mien specified (see 6,2), the vehicle shall ba equipped with a liquid cooled, internal combustion, four
40、-stroke cycle gabone engine with not lcsathrrn six cylinders. furnished shall produce the required vehicle performance when operated on unhaded fuelswith a resoarch octane rating of, 91, at engine epeed nut mara than manufacturers recommended operating speed, The engine shall be capable of warrcriit
41、od operation yn unleaded fuel, when used in accordanca with tha aperctor 8 manual. Unlcafi otherwise specified or raquirad by foreign law$, veliiclt!H or overdeas use shall be capable of accepting and operating on leaded gactoliiie. The ratad net torque output of thu angine shall be: not less than 2
42、65 pound-feat, Engine not torque rating8 and net horsepower figure8 usad in performance prediction calculationa shall be determined in accordance with SAE 5245 or SAE roqrrirod for sngina cooling, ehcrll ha providcd. The engine , 51349. A fnii clutch to reduce fen ept!atl nutomatically, when not 1 3
43、.4.1.3 Oil filter f u r II i a he d A full flow type oil filter shall be 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-46797B 23 W 9999906 OL9379 3 E 3.4.1.4 Governorr An engine governor shall be furnished and set and sealed to limit the en
44、gine to the engine manufacturers maximum recommended operating speed. 3.4.1.5 Coolant temperature control. Thermostatic control of engine coolant temperature shall be provided. On diesel engine driven vehiclee, the control ehall include partial thermostatic- control of coolant flow through.the radia
45、tor and thermostatically controlled radiator ehuttere or complete thermostatic control of all coolant flow through the radiator. Ji 3.4,1,6 Silicone rubber hoses. When specified (see 6.2), eilicone rubber radiator and heater hoses shell be furnished. ,. * 3.4.1*7 Power plant heaters and fuel warmer.
46、 When specified (see 6.2) a coolant heater; an engine oil heater; and a fuel warmer (diesel engine driven,vehiclee only), ehall be provided. specified (see 6.2), a battery heater shall be provided when power plant heatere are epecified. Heaters shall operate on llO-volt alternating current (ac), and
47、 shall be wired through 8 junction block to a eingle external power and grounding vehicle. A three wire connecting cable, 25 feet long and of adequate line capacity to supply power for all heater units eimultaneouely,.ehall be furnished. Connecting cable shall include a matching Eemale connector at
48、the vehicle end and a standard three pronged (two power plus one ground) male connector at the other end. Electrical apparatus ehall conform to Federal Motor Carrier SaPety Regulation 393.77()(7). Electrical insulation of connecting cable shall withstand normal operating stresees in low ambient alr
49、temperaturee (down to minus 60F) withgut cracking or loes of dielectric capacity, Al1 heater lead wiree shall be installed without Interfering with vehicle component operation and without loose exce88 wire, Provieione for etowage of the cable shall be provided in the vehicle cab, Heotere ehall be furnlehed a8 follows: Unless otherwiee three pronged (male), weatherproof, elave receptacle for receiving * (o)
