1、c 23s NIL-T-622YbB 23 7777706 0202874 29 March 1988 SUPERSEDING MIL-T-62246A( AT) 21 April 1981 MILITARY SPECIFICATION TRUCKS, DUMP: STREET MAINTENANCE, DIESEL AND GASOLINE ENGINE DRIVEN, 21,000 POUNDS GVW, 4x2, COMMERCIAL This specification is approved for use by the US Army Tank-Automotive Command
2、, Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive dump trucks equipped with a material sprayer, an auxiliary engine driven
3、air compressor, and a vibrating roller for use in street maintenance. Vehicles shall have a minimum gross vehicle weight (GVW) of 21,000 pounds for normal operating conditions. Vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified i
4、n acquisition documents. 2. APPLICABLE DOCUMENTS 2.1 Government documents. * 2.1.1 Specifications and standards. The following specifications ani. standards form a part of this specification to the extent specified herein. Unless otherwise spcified, the issues of these documents shall be those liste
5、d in that issue of the Department of Defense Index of Specifications and Standards (DoDISS), and supplement thereto, cited in the solicitation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this doeument should be addressed to: US
6、 Army Tank-Automotive Command, ATTN: AMSTA-UED, Warren, MI 48397-5000, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A JFSC-23201 DISTRIBUTION STATEMENT A. Approved for public release; distribution
7、is unlimited. THIS DOCUMENT CONTAINS 27 PAGES. -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-6226B 23 7777b 02011875 T m SPECIFICATIONS FEDERAL W-B-131 L ZZ-T-38 1 MILITARY NIL-?3-46176 4 STANDARDS FEDERAL FED-STD.29 7 t MIL-T-62246B( AT)
8、Battery, Storage: Vehicular, Ignit-ion, Lighting and Starting. Tires, Pneumantic, Vehicular (Highway). Brake muid, Silicone, Automotive, All Weather, Operat ional and PceseiivaCive. Rustgroofing of Commercial (Nontactical) Vehicles. Nontactical Wheeled: VehicIes Treament, FaLnt ing, Identification M
9、arking and Data 1at.e Standards. Pntle Assembly, Tdwiag - 13,000 Lbs., Capacity, Mat!rfxrrI, Release-, Light, WarrrStIg, VehdcuTar, Rattirtg, D;C. 2 1 .Z Other ,Government docu-ments . The following other Government documents form 8 part af thfs specificition to the extent specified herein. Unless o
10、therwise specified, the issues shall be chose in effect on the date of the solictatian, DEFARTME“? OF THANSPORTATLON (MT) Federal Notar CarrLeE Safety Regulations, Federal Kotor Vehicle Safety Standards, (ApplLcations fog copies of DOT publications should reference the I the body; and a full complem
11、ent of fuel, lubricants and coolant. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-622LIhB 23 m 777970b 02OLO 3 m 3.2.5 Gross vehicle weight. Gross vehicle weight (GVW) shall consist of curb weight, operator weight (computed at 175 pounds), a
12、nd a payload to provide not less than the specified GVW. 3.2.6 Weight distribution. The distribution of GVW for the purpose of establishing suspension, axle and tire capacities shall be determined with the payload uniformly distributed over the load area. 3.2.7 Ratings. Vehicle ratings shall be the
13、manufacturers published ratings. Component and vehicular ratings shall not be raised to meet the requirements of this specification. When published ratings are not available, verification of ratings shall be available to the engineering office of the procuring activity. Minimum GVW rating shall be 2
14、1,000 pounds. Jc 3.2.8 Overall width. The overall width of the vehicle, exclusive of mirrors, lights, reflectors and tires, shall be not more than 96 inches. The width over the tires shall be not more than 100 inches. * 3.2.9 Accessibility. The design of the vehicle and optional equipment shall perm
15、it access for routine servicing and shall permit access for replacement and adjustment of component parts and access- ories with minimal disturbance of other components and systems. 3.3 Performance. 3.3.1 Speeds. High and .low speed requirements shall be met wit the truck loaded to specified GVW. I
16、3.3.1.1 High speed gradeability. The vehicle shall ascend a continuous grade of 1.5 percent at 50 miles per hour (mph). Gradeability requirements shall be met with the main transmission in direct drive, and when a multispeed axle is furnished with the axle in high speed range. Gradeability shall be
17、verified with calculations in accordance with SAE 5688 (see 6.3). 3.3.1.2 Low speed. Low speed for vehicles with a manual transmission shall be calculated with the engine operating at not less than 35 percent of the recommended governed speed, and shall provide a vehicle speed of not more than 3 mph
18、. Jc 3.3.1.3 Maximum geared speed. Maximum geared speed at engine governed speed shall be not less than 58 mph. Conformance to geared speed specified shall be determined by calculating in accordance with the following formula: Maximum geared speed (mph)= Governed speed (rpm) Total gear reduction x t
19、ire factor (see 6.3). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3.2 Service brakes. The service brakes shall control and hold vehicle, when loaded to its specified GVW, on a 30 percent grade. the The service brakes shall stop the vehicle, l
20、oaded to specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52. 3.4 Chassis components. 3.4.1 Engine. The engine furnished shall be the chassis manufacturers standard or optional engine for the commercial model truck which meets or exceeds the req
21、uirements of this specification. * 3.4.1.1 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 used in performance pr
22、edict ion calculations shall be determined in accordance with SAE 51349. * 3.4.1.2 Gasoline engine. When specified (see 6.2), the vehicle shall be equipped with a liquid cooled, internal combustion, four-stroke cycle gasoline engine with not iess than six cylinders. used in performance prediction ca
23、lculations shall be determined in accordance with SAE 51349. The engine furnished shall produce the required vehicle performance when operated on unleaded fuel with a research octane rating of 91, at an engine speed not more than the manufacturers recommended operating speed. The engine shall be cap
24、able of warranted operation on unleaded fuel, when used in accordance with the operators manual. Net horsepower 3.4.1.3 Oil filter. A full flow type oil filter shall be furnished. 3.4.1.4 Governor. An engine governor shall be furnished and set and sealed to limit the engine to the engine manufacture
25、rs maximum recommended operating speed. * 3.4.1.5 Cooling system. The cooling system shall maintain the engine coolant at a temperature below the boiling point with the vehicle loaded to rated GVW and operated at an altitude of 10,000 feet above sea level, or in an ambient air temperature of not les
26、s than 125 degrees Fahrenheit (OF). The cooling system shall include a surge tank or a coolant recovery reservoir of not less than two-quart capacity. A high coolant level alarm buzzer and a red indicator warning light shall be provided on the instrument panel. servicing access door shall be provide
27、d to allow verification of the coolant level. On tilt cab models, a radiator 8 , O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-622468 23 U 9999906 02012 7 m MIL-T-622 46B ( AT) J; 3.4.1.6 Coolant temperature control. Thermostatic control of
28、 engine coolant temperature shall be provided. On diesel engine driven vehicles, the control shall include partial thermostatic control of coolant flow through the radiator and thermostatically controlled radiator shutters or complete thermostatic control of all coolant flow through the radiator. *
29、3.4.1.7 Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce the fan speed automatically when the fan is not required for engine cooling. 3.4.1.8 Power plant heaters and fuel warmer. When specified (see 6.2). a coolant heater. an engine oil heater, and a fuel warmer (diesel engine
30、 driven vehicles only) Shall be provided. Unless otherwise specified (see 6.2), a battery heater shall be provided when power plant heaters are specified. Heaters shall operate on 110-volt alternating current (ac), and shall be wired through a junction block to a single three-pronged (male), weather
31、proof slave receptacle for receiving external power and grounding the vehicle. cable, 25 feet long and of adequate line capacity to supply power for all heater units simultaneously, shall be furnished. The connecting cable shall include a matching female connector at the vehicle end and a standard,
32、weatherproof, three-pronged (two power plus one ground) male connector at the other end. Electrical apparatus shall conform to Federal Motor Carrier Safety Regulation 393.77()(7). insulation of the connecting cable shall withstand normal operating stresses in low ambient air temperatures (down to mi
33、nus 60F) without cracking or loss of dielectric capacity. Ail heater lead wires shall be installed without interfering with vehicle component operation and without loose excess wire. Provisions for stowage of the cable shall be provided in the vehicle cab. Heaters shall be furnished as follows: (a)
34、A coolant heater, 1500-watt minimum rating, shall be installed in the engine block or lower coolant inlet hose. Engine thermostat with an operating range of 170F to 195F shall be instal led (b) An immersion type engine oil heater, 300-watt minimum rating, with 170F to 195OF thermostat, shall be inst
35、alled in the oil pan through any convenient opening A battery heater shall have a capacity adequate to maintain the battery electrolyte at a temperature of not less than 10F during vehicle exposure in ambient air temperatures as low as minus 60F, and shall include a thermostat to limit the temperatu
36、re of the electrolyte to not more than 80F For diesel engine driven vehicles, a fuel warmer or pre-heater shall be provided to prevent clogging of fuel filters due to A three-wire connecting Electrical (c) (d) 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
37、m IHS-,-,-MIL-T-6 2 2 46 B ( AT) wax crystallization in the fuel. The fuel warmer shall use engine coolant to transfer sufficient heat to the diesel fuel to heat it from an inlet temperature of minus 40F to an outlet temperature of plus 9F, with a flow rate not less than the maximum fuel demand of t
38、he engine fuel system. A coolant shutoff valve shall be provided for the coolant inlet side of the fuel warmer unit. 3.4.2 Electrical system. The electrical system shall be in accordance with Federal Motor Carrier Safety Regulations 393,27 through 393.31 and 393.33. * 3.4.2.1 Starting system (diesel
39、 engines). For diesel engine driven vehicles, a 12- or 24-volt direct current (dc) starting system, with a 12-volt dc lighting system, and not less than a 60 ampere alternator, shall be furnished. Engine starting equipment shall include an ether starting system or a glow plug. If an ether system is
40、furnished in lieu of a glow plug, it shall be of the measured shot type. The measured shot type ether system shall be key operated or manually operated from the drivers compartment and shall be inoperative with the engine warm. Complete provisions for a replaceable ether reservoir of not less than 1
41、2 fluid ounces shall be furnished, A reservoir need not be furnished. 3.4.2.2 Ignition system (gasoline engines). For gasoline engine driven vehicles, a 12-volt dc ignition system shall be furnished. An alternator of not less than 40-ampere rated capacity, and which provides not less than 16 amperes
42、 dc output at normal engine idle speed, shall be furnished. * 3.4.2.3 Lighting. All vehicle lights, reflectors and wiring shall conform to Federal Motor Carrier Safety Regulations 393.12, 393.19, 393.20 and 393.22 through 393.26(d). manufacturers standard or optional feature, the brake lights shall
43、override the four-way emergency flasher. Lights and reflectors shall not be mounted on vertical surface of rub rails or mounted on vehicle bumpers (unless recessed and fully protected). When available as the 3.4.2.4 Turn signals. Turn signal lamps shall conform to SAE 5588. Operating units shall con
44、form to SAE 5589, class A, and shall be mounted on the steering column. The vehicle shall be provided with double-faced front signal units and with single-faced rear signal units. Signal units shall be installed in accordance with SAE 5588, except that turn signals shall not be mounted on the engine
45、 compartment hood. Turn signal operating units shall be of the self-cancelling type with a visible and audible type flash indicator. 10 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-6224bB 23 999990b 020L4 O Engine type MI L-T-6 2 2 4 6 B (
46、 AT) (minut es ) (amperes) 3 20 1,200 3.4.2.5 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity ratings and the total cold cranking ratings at OOF, both measured in accordance with SAE 5537, shall be not less than specified in table I. The batteries shall be of the ma
47、intenance free type having the maintenance-free characteristics listed in W-B-131. TABLE I. Batteries. 1 1 Reserve capacity I Cold cranking I 1Gasoline 1 1 O0 I 4 50 1 * 3.4.2.6 Radio interference suppression. The vehicle shall be suppressed to limit electromagnetic radiation in accordance with SAE
48、5551. Any body equipment emitting electromagnetic radiation, except the vibrating roller auxiliary engine (see 3.5.5.3), shall be suppressed to the same level as the vehicle chassis. 3.4.3 Fuel system. The fuel system shall conform to Federal Motor Carrier Safety Regulations 393.65 and 393.67. * 3.4
49、.3.1 Air cleaner. An air cleaner shall be furnished. * 3.4.3.2 Fuel tanks. The fuel tank(s) shall be the manufacturers standard for the vehicle specified with not less than 30 gallons total capacity. When more than one tank is furnished on diesel engine driven vehicles, means shall be provided to assure an equalized fuel level in both tanks, When more than one tank is furnished on gasoline engine driven vehicles, a selector valve
