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|  MIL-T-83808
(84)
4.6.7.1
The vehicle shall be weighed to determine curb weight and distribution of curb
weight on front and rear axle. The imposed loading of the front and rear axles shall be computed using the
curb weight, the operator weight at 175 pounds and the payload (see 3.1.12) to provide the GVW of the
tractor. Calculated imposed loads shall be utilized to ascertain that the suspension, axles and tires fur-
nished are of adequate capacity to meet contract requirements. Show vehicle conforms with 3.1.11.
4.6.7.2
EMI test. The vehicle shall conform to the requirements of paragraph 3.1.7 when tested in ac-
cordance with the procedures of MIL-STD-462, Notice 2.
Fuel consumption. The vehicle shall be tested for fuel consumption at 5 MPH exerting 500
4.6.7.3
pounds DBP and at 15 MPH with no load. Each speed will be tested for one hour. The distance shall be
verified by fifth wheel, and test track shall be relatively level. The fuel measuring device and all fuel
economy correction shall be in accordance with SAE J1 082.
4 . 6 . 7 . 4 Tire chains. Type "RS" tire chains shall be installed on all four wheels, and the tractor shall be
driven for five minutes making right and left turns at a 17 foot radius, as well as for five minutes making
right and left turns at a 23 foot radius to show that sufficient clearance exists
The tractor shall be driven over a course of 12 tractors wheel base length
4.6.7.5
(WBL). One wheel track shall have timbers spaced at 0.3 WBL. The other track shall have timbers spaced
at 0 4 WBL. Four by four timbers shall be used. Timber spacing shall be fixed by rope of cable connection.
The test shall consist of six round trips over the course at a speed of 8 MPH and six round trips over the
course at a speed of 4 MPH (70 timbers will be required).
4.6.7.5.1 Torsion test. The tractor shall be driven over a course of 12 tractors WBL. One wheel track
shall have ramps spaced at two WBL starting at an initial position. The other track shall have ramps
spaced at two WBL starting at one WBL from the initial position. Eight inch by eight inch ramps may have
an angle at each end of not less than 30. The test shall consist of 12 round trips over the course at a
speed of 4 MPH. The ramps shall be fixed by rope or cable connection.
4.6.7.6
Human factors e ngineering (HFE) evaluation. Two operators, one as large as 95 percentile
male and one as small as a five percentile female in accordance with SAE J833, shall demonstrate that all
controls, switches and any other components are located so as to assure the operators can reach, re-
move, manipulate, maintain or operate them (see 3.4) per MI L-STD-1472
d leveI tests The sound level inside the cab at the operator's ear level and outside the
4.6.7.7
cab at a distance of 15 feet at a five foot height shall be measured and recorded Tractor shall meet re-
quirements of 3.1.8.
Alternate fue l test. The vehicle shall use JP-4 fuel and shall be driven a total of eight hours at
4.6.7.8
20 MPH exerting a 1,000 DBP After every hour, a 10 minute break shall be taken. Following 10 minute
break the vehicle shall be tested per paragraph 4.6.4 except fuel used in the engine shall be JP-4 fuel and
minimum drawbar pull exerted shall be 3690 pounds The tractor shall then be driven 1 hour at 5 MPH
exerting a 2,250 DBP. Failure to tow said loads and/or failure to complete test shall be cause for rejection.
46.7.9
Corrosion test A three foot by two foot panel, rustproofed in accordance with the contractor's
standard commercial practice and painted in accordance with 3.8 of this specification, shall withstand 120
hours of a five percent, plus or minus one percent, concentrated salt spray in a closed environment
without any evidence of corrosion.
4 . 6 . 7 . 1 . 0 Cold start test he vehicle shall be cold soaked for a period of not less than 24 hours in an
T
ambient temperature of-65F, plus or minus 2.5F. The starting-aid device selected, as well as specific
heaters stated in 3.6, shall be the only starting aids used for this test Arctic fuel and lubricants shall be
permitted at this temperature At this time the vehicle shall be tested for operation of all lights brakes,
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