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|  MIL-T-62299B(AT)
3.3.1.1 High speed gradeability. The vehicle shall ascend
continuous grades of not less than 1.0 percent at 55 tiles per hour
(mph). Gradeability requirements shall be met with the transmission in
direct drive and, when a multispeed axle is furnished, with the axle in
high speed range. Gradeability shall be verified with calculations in
accordance with SAE J688 (see 6.3).
3.3.1.2 Low speed. Low speed shall be calculated with engine
operating at not less than 35 percent of recommended governed speed and
shall provide a vehicle speed not greater than 4 mph.
*
3.3.1.3 Maximum geared speed. The 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 tire factor (see 6.3)
3.3.2 Service brakes. The service brakes shall control and hold
the vehicle, when loaded required GVN, on a 30 percent grade. The
service brakes shall stop the vehicle, loaded to required GVW, within
the stopping distance requirements of Federal Motor Carrier Safety
Regulation 393.52.
3.3.3 Turning radius. The turning radius, as defined in SAE J695,
shall be not greater than 45-1/2 feet.
3.4 Chassis components.
3.4.1 Engine. The engine furnished shall be the chassis
manufacturer's standard or optional engine for the commercial model
truck, which meets or exceeds the requirements of this specification,
*
3.4.1.1 Diesel engine. The engine shall be a liquid cooled,
compression ignition, two-stroke or four-stroke cycle diesel type, with
not less than six cylinders. Engine net horsepower used in performance
prediction calculations shall be determined in accordance with SAE J816
or SAE J1349. A fan clutch shall be provided. The fan clutch shall
reduce the fan speed automatically when the fan is not required for
engine cooling.
A full flow type oil filter shall be
3.4.1.2 Oil filter.
furnished.
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