MIL-PRF-83818B
intrusion into the exhaust system. Muffler and exhaust piping shall conform to the requirements
of UL 558.
3.14 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.
3.15 Steering. Power steering shall be furnished. 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.
3.16 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.
3.16.1 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.
3.16.2 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.
3.16.3 Fail-safe hydraulic lift system. The truck shall be equipped with a fail-safe hydraulic lift
system which will automatically prevent load lowering and fork forward tilting in the event of
electrical, hydraulic or pneumatic failure; hydraulic or pneumatic failure includes any
component, line or hose. Check valves have been used in the past to prevent load lowering.
Pressure relief valves or regulators shall be provided in the hydraulic and pneumatic systems to
prevent overpressure. In addition, a means shall be provided to manually override the system to
allow safe and slow lowering (not more than 10 feet per minute) of loaded or unloaded forks.
3.16.4 Hydraulic schematic. The hydraulic schematic shall be provided on a durable material
and should be stored in the cab. For example: A book with hard plastic pages (tear resistant &
smear resistant).
3.17 Brakes.
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