MIL-PRF-83818B
3.9.3 Operator's overhead guard. An overhead guard shall be furnished. The overhead guard
shall meet all of the requirements of ASME B56.1 including falling object protective structure
(FOPS) and inside clearances.
3.9.4 Welding. All welds shall be smooth, continuous, with complete heat penetration and shall
transmit stress without permanent deformation or failure when the truck is subjected to normal
service and the testing of this specification. The contractor's welders, welding operators and
welding procedures shall be qualified to meet the welding requirements of the AWS B2.1 or
ASME Boiler/Pressure Vessel Code Section IX.
3.10 Rated load. The rated load for the Type I shall be a 4,000 (+100, -0) pound cube, 48 inches
on each side with a center of gravity located at the geometric center of the cube. The rated load
for the Type II shall be a 6,200 (+125, -0) pound cube, 48 inches on each side with a center of
gravity located at the geometric center of the cube.
3.11 Engine. The truck shall be powered by a standard, commercial engine. Horsepower and
torque characteristics shall be sufficient to provide the performance specified herein and shall be
at a RPM which will assure performance with an adequate margin of safety.
3.11.1 Diesel engine. The truck shall be equipped with a diesel engine. Emergency shutdown
provisions shall be furnished when recommended by the engine manufacturer. The engine shall
crank and start within five minutes in any ambient temperature (and with the truck initially
stabilized at ambient temperature) from 0° F to +125° F. Glow plugs or other accessories
working off the cranking batteries and auxiliary fluid priming systems which are permanently
mounted on the truck and normally used in starting the vehicle may be used. The diesel engine
shall operate on diesel fuel in accordance with A-A-52557. Either the engine or forklift
manufacturer shall certify that the engine is capable of operating on JP-8 conforming to MIL-
DTL-83133 for 400 hours, during normal commercial or military situations, without detrimental
effect on the engine. Some power loss is expected, but the forklift shall be able to perform
normal operations. A certification letter should be included in the first article test report. An
example of a previous certification letter is shown in Figure 1. The truck shall be DS rated
according to UL 558.
3.11.2 LPG engine. When specified (see 6.2), the truck shall be equipped with a liquefied
petroleum gas engine. All necessary filters and components required for LPG operation shall be
provided. It shall be of sufficient capacity to provide at least 6 hours of continuous operation. A
means shall be provided to prevent fuel flow when the engine run control (ignition switch) is off,
or if the engine should stop running. The truck shall be LPS rated according to UL 558.
3.12 Fuel tank. The standard diesel fuel tank shall be of sufficient capacity to allow a minimum
8 hours of continuous operation without refueling. The tank filler neck shall be designed to
operate with an OPW (www.opw-fc.com) fuel nozzle model 295AF. The dimensions for the
OPW 295AF are available on their web site.
3.13 Engine exhaust. The exhaust system shall incorporate a muffler, and shall terminate at a
location clear of the operator's station. A means shall be furnished to prevent rain water
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