1、 Fed Std 794 Y Aug 1, 2005Revision 1Oct 31, 2005 SupersedingFed Std 794X October 1, 2004 FEDERAL STANDARD TRUCKS: MEDIUM COMMERCIAL, 4X2 and 4X4 9,500 TO 16,000 KG (21,000 TO 35,000 LBS) GVWR Federal Standard 794Y Page - 1 - of 79 Provided by IHSNot for ResaleNo reproduction or networking permitted
2、without license from IHS-,-,-TRUCKS AND TRUCK TRACTORS: Medium Commercial 4X2 when on the hook, loop or protective bracket; shall be accessible to an operator standing on the ground to the rear of the cab, on the street side of the vehicle. 3.4.2.6 BATTERIES. Each battery shall be of 12-volt potenti
3、al. The total reserve capacity ratings and the total cold cranking ampere ratings at -18C (0F), both measured in accordance with SAE J537, shall be not less than specified in Figure 2. The batteries shall be of the maintenance-free type having the maintenance-free characteristics listed in A-A-55439
4、. Batteries shall conform to TMC RP 109A. Figure 2 Batteries RESERVE CAPACITY COLD CRANKING ENGINE TYPE (MINUTES) (AMPERES) Diesel engine 540 1875 Gasoline engine 115 535 3.4.2.7 RADIO INTERFERENCE SUPPRESSION. The vehicle shall be suppressed to limit electromagnetic radiation in accordance with SAE
5、 J551. Any body equipment emitting electromagnetic radiation 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. 3.4.3.1 AIR CLEANER. A dry type air cleaner shall be provided. 3.
6、4.3.2 FUEL TANK(S). Except as specified for Type II tractors or unless otherwise specified for other vehicle types, fuel tanks shall be not less than 189 L (50 gallons) total capacity. Type II tractors shall be equipped with fuel tank(s) of not less than 378 L (100 gallons) total capacity. When more
7、 than one fuel tank is furnished on diesel engine driven vehicles, means shall be provided to assure equalized fuel level in both tanks. When more than one tank is furnished on gasoline engine driven vehicles, a selector valve connecting either tank to engine fuel intake shall be provided and means
8、shall be provided to monitor the fuel level of either tank from a single fuel gage; or an equalizing pump shall be used to maintain the same fuel level in both tanks. When fuel crossover Federal Standard 794Y Page 16 of 79 Provided by IHSNot for ResaleNo reproduction or networking permitted without
9、license from IHS-,-,-lines are furnished they shall be in accordance with TMC RP 321. 3.4.3.3 FUEL AND WATER SEPARATOR. The manufacturers standard or optional fuel filter shall be provided. A fuel and water separator shall also be furnished for diesel engines. The separator shall include water coale
10、scent and a drain valve. A combination filter/separator unit may be provided. See option FFS for heated fuel and water separator. 3.4.4 EXHAUST SYSTEM. The exhaust system shall conform to Federal Motor Carrier Safety Regulation 393.83. 3.4.5 TRANSMISSION. Unless otherwise specified, the vehicle shal
11、l be equipped with an Allison or equal automatic transmission model 2500, 3500 or 4500 as applicable for engine supplied. The automatic transmission shall include a hydraulic torque converter and not less than five forward gear ratios. Normal driving range selector position shall provide not less th
12、an five gear ratios without movement of the selector. The net torque capacity and the net power rating of the transmission shall exceed the output ratings of the engine. The transmission shall be provided with power takeoff provisions to include gear and opening. 3.4.5.1 TRANSFER CASE. A two-speed t
13、ransfer case shall be provided on 4x4 vehicles. 3.4.6 DRIVELINE COMPONENTS. Driveline components shall be rated to transmit the maximum delivered torque of the engine, as developed through the maximum gear train reduction. The drive shaft for front mounted winches shall have an angle not greater tha
14、n 16 degrees from the longitudinal plane. Components shall be rated no less than the GCWR in 3.2.9. Drivelines shall be balanced and free of vibration. 3.4.7 FRAME. The chassis frame shall be the manufacturers standard for the type and class vehicle furnished. Reinforcements shall extend at least fr
15、om the rear of the front suspension, rear hanger bracket to the front of the rear spring, front hanger bracket. Reinforcements for Type III stake dumps and Type IV dumps shall provide sufficient structural strength in the chassis frame, through increased resisting bending moment (RBM), to at least e
16、qual the loads imposed, with the dump truck loaded to provide specified GVW. Frame reinforcement for Type III stake with crane shall be in accordance with the body manufacturers recommendations for the size of the crane furnished. Frame rails shall not project beyond the rear end of the body. Unless
17、 otherwise specified, on Type II tractors, the chassis frame rails shall be cut off immediately to the rear of the rear spring rear hanger brackets or the frame crossmember closest to the rear of these brackets. When a RBM is specified, any frame combination of yield strength and section modulus tha
18、t provides the required RBM is acceptable. 3.4.8 SUSPENSION. Except as specified in option codes MPR and MPS, the vehicle shall be equipped with a suspension system with components having a rated capacity at least equal to the load imposed on each member, measured at the ground, with the vehicle loa
19、ded to specified GVW. When suspension is rated at the spring pads, un-sprung weight shall be deducted. The vehicle shall be equipped with hydraulic, double-acting shock absorbers at the front wheels. 3.4.9 AXLES. Except as specified in option codes MPR and MPS, axle ratings shall be at least equal t
20、o the load imposed on each axle, measured at the ground, with the vehicle loaded to specified GVW. The wheel bearings and axle spindles shall be oil lubricated except on front drive axles. Federal Standard 794Y Page 17 of 79 Provided by IHSNot for ResaleNo reproduction or networking permitted withou
21、t license from IHS-,-,-The hubcaps, except for driving axles, shall have a window for visual determination of oil level. Provisions for venting or withstanding internal pressure buildup and for replenishing the oil supply shall be provided. 3.4.9.1 TRACTION CONTROL. Automatic traction control shall
22、be provided on all Type IV dumps. Maximum traction capabilities shall be maintained at all times under each drive wheel(s) for the life of the vehicle. 3.4.10 WHEELS, RIMS AND TIRES. Unless otherwise specified, the vehicle shall be equipped with single front and dual rear wheels. Unless otherwise sp
23、ecified Hub piloted, disc type wheels shall be furnished. Disc wheel sizes shall be the same for all wheels except where required otherwise. Tire size and load range (ply rating) shall be the same for all tires except class F vehicles or where required to be otherwise. The rear axles of dump trucks
24、shall have Goodyear G244MSD, Michelin XDE M/S or equal tires. Tire and wheel assemblies shall be balanced. When the front tires extend beyond the cab fenders, rubber fender extensions extending at least to the outside of the tire tread shall be furnished. Tires and wheels shall conform to Tire and R
25、im Association or to the European Tyre and Rim Technical Organization recommendations for the type and size furnished. Under no circumstance shall the vehicle maximum governed speed exceed the speed rating of any of the furnished tires or wheels. 3.4.10.1 TIRES. Unless otherwise specified, standard
26、profile steel belted radial ply tires shall be provided. Tires shall have highway tread on 4x2 vehicles and all terrain (AT) tires or on-off road (OO) tires on 4x4 vehicles, and the rear axle of dump trucks. Tires shall be of the tubeless type. Except as specified in option codes MPR and MPS, tires
27、shall be of rated capacity at least equal to the load imposed on each tire, measured at each wheel, at the ground, with the vehicle loaded to specified GVW. Tires shall conform to the Tire and Rim Association or to The European Tyre and Rim Technical Organization recommendations. 3.4.10.2 TIRE CHAIN
28、 CLEARANCE. Tire chain clearance in accordance with SAE J683 shall be provided. Allowance for spring deflection shall be included. 3.4.11 BRAKES. Brakes shall conform to Federal Motor Carrier Safety Regulations 393.40 through 393.43 and 393.45 through 393.52. Brake linings shall be of non-asbestos m
29、aterial. Class C vehicles shall be equipped with power assisted, hydraulic or air-hydraulic, service brakes. 3.4.11.1 AIR BRAKES. The class D, E, F and G vehicles shall be equipped with full-air brakes. The braking system, complete with all necessary components, shall include: (a) Air compressor, un
30、loader-head type, engine driven and engine lubricated, air or water cooled, and having a capacity of not less than 340 L/min (12 cubic feet per minute (cfm). (b) Air storage reservoir(s), each tank equipped with drain, and with safety and check valves between the compressor and the last reservoir ta
31、nk (c) Foot control, suspended or treadle type (d) Air control valves (e) Air pressure gage, visible to the driver (f) Low air pressure warning, visible and audible (g) Service brake stop lamp switch (h) Automatic moisture ejector on air storage reservoir (i) Automatic slack adjusters on Federal Sta
32、ndard 794Y Page 18 of 79 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-cam type brakes or internal self-adjusting brakes on wedge and disc type brakes on all axles (j) Brake dust shields on rear (k) Spring set parking brake 3.4.11.1.1 AIR DRYER. An
33、 air dryer with a replaceable spin on/off desiccant cartridge shall be installed in the air brake system. The dryer shall have the capability of removing not less than 95 percent of the moisture in the air being dried. The dryer shall have a pre-cooler and a filter to screen out oil and solid contam
34、inants. The dryer shall have an automatic self-cleaning cycle and a thermostatically controlled heater to prevent icing of the purge valve. Air dryer shall conform to TMC RP 637. 3.4.11.2 TRAILER BRAKE CONTROL SYSTEM. In addition to the components specified in 3.4.11.1 and 3.4.11.1.1, a trailer brak
35、e control system shall be furnished for Type II tractors and when a trailer-towing package option code TTP is required for air brake equipped chassis. The trailer brake control system shall include: (a) Identification of emergency and service lines (b) Coincident control of trailer brakes with prime
36、 mover foot control (c) Independent hand control for trailer brakes (d) Prime mover protection valve with dash control and automatic breakaway feature (e) Trailer stoplight control operable with foot brake and with hand control for trailer brakes (f) Two SAE J844 coiled air hoses, not less than 2800
37、 mm (110 inches) long when fully extended, with SAE J318 glad hand couplers on both ends of hoses (not required for Type II tractors unless a trailer towing package is specified). The hoses shall be packaged and stowed in the vehicle tool compartment for shipment. (g) Air connectors for trailer with
38、 SAE J318 glad hand couplers mounted at the rear of the vehicle, located to prevent interference with a trailer (not required for Type II tractors unless trailer towing package is specified). Air connectors and glad hands on Type IV dumps shall be located to prevent damage during dumping of the carg
39、o. (h) Two SAE J844 coiled (or straight when specified) connecting air hoses, not less than 2800 mm (110 inches) in length when fully extended, equipped with coiled spring hose guards, and SAE J318 glad hand quick connector on trailer end of hoses (Type II tractors only). (i) Unless otherwise specif
40、ied, supports on the cab or on a pogo stick type hose tender with dummy glad hand connectors to retain hoses when not in use (Type II tractors only). Supports shall not be mounted on the cab roof. The dummy glad-hand couplers shall be located on the street side rear of the cab and shall be accessibl
41、e to an operator standing on the ground. Supports shall conform to TMC RP 417. (j) Dummy glad hand couplers with security chains or cables (not required for Type II tractors unless a trailer towing package is specified). (k) Prime mover only parking brake valve to permit mover parking brakes to be a
42、pplied while charging the trailer air brake system. Federal Standard 794Y Page 19 of 79 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4.11.3 ANTILOCK BRAKE SYSTEM. Vehicles equipped with air brakes shall be provided with an antilock brake system
43、in accordance with FMVSS 571.121. Vehicles equipped with hydraulic brakes, shall be provided with an antilock brake system in accordance with FMVSS 571.105. Type II tractors shall have the SAE J560 seven-pin connector wired to conform to TMC RP 137. 3.4.12 CAB. Unless otherwise specified, an OEM con
44、ventional type full width cab shall be provided. Unless otherwise specified, a cab with a forward tilting hood and fender assembly, including tilting and locking mechanism, shall be provided. Tilting shall not interfere with installed equipment. Both cab doors shall be equipped with locks, operable
45、from inside the cab through mechanical linkages and equipped with external, key operated locks. Drip protection shall be provided above the cab doors. Safety grips or grab handles shall be provided on each side of the cab to assist personnel in entering and leaving the cab and, in addition, for Type
46、 II tractors, to assist personnel in climbing onto the truck tractor deck plate. When step height into the cab exceeds 610 mm (24 inches) a secondary step shall be provided, in accordance with TMC RP 404B. When a snowplow or snowplow provisions are specified, service hatches or access or butterfly t
47、ype hood shall be furnished to provide access for routine engine maintenance with a snowplow attached. Cab equipment shall include: a 12-volt electrical power point outlet (receptacle), easily accessible to the seated driver; and tinted glass in all windows, where optionally available from the chass
48、is manufacturer. 3.4.12.1 CAB INTERIOR. Unless otherwise specified, the cab shall have an upholstered, full width, adjustable seat and back or individual, adjustable, drivers seat and individual passenger seat. The color of the upholstery and the interior finish shall be compatible with the exterior
49、 color (see 3.1.1.1). White upholstery shall not be furnished. Interior lighting shall be provided. Three sets of seat belts shall be installed on bench seats. Outboard seats shall have combination pelvic and upper torso restraint seat belts. A rear cab window shall be furnished, unless a sleeper compartment is specified. 3.4.13 STEERING. Power steering shall be furnished. 3.4.14 WINDSHIELD The vehicle shall be equipped with dual windshie
