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Truck tractor weight distribution |
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|  MIL-T-62735
3.1.7 Weight distribution. Except as specified in 3.1.7.2 and 3.1.7.3, the weight
distribution for the purpose of establishing required suspension, axle and tire capacities shall be
determined with the payload uniformly distributed over the load area (see 6.4). A vehicle with a
crew (four-door) cab shall have the weight distribution determined with 240 kg (525 pounds) of
the payload in the rear seat.
3.1.7.1 Truck tractor weight distribution. Truck tractors shall have the fifth wheel
located so that with the truck tractor loaded to GVW, the load ratings of the chassis components
are not exceeded (and also located to conform to 3.4.2.4 through 3.4.2.4.3). Truck tractors with a
sliding fifth wheel shall have the weight distribution determined with the sliding fifth wheel
located in its most forward position of adjustment.
3.1.7.2 Specified GAWR. The gross axle weight ratings (GAWR) shall be as determined
and required by 3.1.7 and 3.1.7.1 except for the specified GAWR as follows:
(a) Class 32, model 4x2
- 4540 kg (10,000 pounds) front, 10 200 kg (22,500 pounds)
rear.
(b) Class 50, model 6x4 - 5450 kg (12,000 pounds) front, 17 250 kg (38,000 pounds)
rear.
(c) When specified (see 6.2), for any type, class and model, the front and rear GAWRs
shall be as specified and 3.1.7 does not apply.
3.1.7.3 Snowplow weight provisions. When a snowplow is specified (see 3.7), or when
specified (see 6.2) for future installation of a similar snowplow, components shall provide
increased front GAWR.
3.1.7.3.1 Front GAWR snowplow provisions. The front GAWR shall be not less than
the load imposed by the snowplow (or a 860 kg (1,900 pound) load 1520 millimeters (mm)
(60 inches) forward of the centerline of the front axle when snowplow weight provisions but not
a snowplow are specified) plus a payload uniformly distributed over the load area, both totaling a
payload to provide not less than the specified GVW.
3.1.7.3.2 Rear GAWR snowplow provisions. The rear GAWR shall be not less than the
load imposed without the snowplow by a payload uniformly distributed over the load area to
provide not less than the specified GVW.
3.1.8 Truck tractor GCW. The gross combination weight (GCW) for truck tractors shall
be the sum of:
(a) The truck tractor curb weight
(b) The operator weight 80kg (175 pounds), and
(c) The weight of a semitrailer, loaded to provide not less than the truck tractor GCW
specified in table II.
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