MIL-PRF-83830C
3.11 Fuel tank. The capacity of the fuel tank shall be adequate to allow at least 10 hours of
continuous operation as defined in section 4. If the fluid level of the tank is above the engine,
the tank shall be provided with a hand-operated fuel shutoff valve attached directly to the tank.
The fuel tank cap shall be approved DS cap. A data plate shall be furnished near the fill pipe
marked "Diesel Fuel" in not less than 1-inch high letters. 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.
3.12 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
intrusion into the exhaust system. Muffler and exhaust piping shall conform to the requirements
of UL 558.
3.13 Transmission. The transmission shall be the full torque, power-shift type in
combination with a torque converter. The transmission shall provide at least two forward and
two reverse speeds. Selective forward and reverse directional controls activated by the
operator's foot are not acceptable. The transmission shall provide for positive inching or
declutch control throughout the entire engine rpm range, in both forward and reverse directions.
The inching or declutch control shall permit lifting of rated load, at maximum engine speed,
while the transmission is in a forward or reverse gear, with no vehicle motion. When specified
(see 6.2) a transmission oil cooler shall be furnished.
3.14 Steering. The steering system shall provide positive hydraulic power steering control
of the truck at all speeds and during all operations. For rigid frame trucks, the system shall
provide the operator the option of two-wheel, four-wheel, and crab steer. Articulated frame
trucks shall provide articulated frame steer. In the event of a power failure, the forklift shall be
equipped with an emergency power steering mechanism. This supplemental power steering
mechanism shall allow the vehicle to be controlled while moving.
3.15 Hydraulic system. The hydraulic system shall consist of all hydraulic components
necessary for operation of the forklift, including a filter. All hydraulic hoses shall have a
working pressure equal to or greater than the hydraulic system maximum relief valve setting.
The hydraulic fluid fill point shall be properly labeled. The hydraulic fluid shall comply with the
requirements of MIL-PRF-83282.
3.15.1 External leakage. During all testing, the degree of external hydraulic system leakage
shall not exceed a Class 3 for dust free conditions and a Class 3 D for dusty conditions of SAE
J1176. External hydraulic system leakage shall not exceed a Class 3 for production trucks under
normal operation.
3.15.2 Hydraulic reservoir. The hydraulic reservoir filler shall be of sufficient inside
diameter to accept a filler tube of at least 1.56 inches outside diameter.
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