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|  MIL-T-17491H (SA)
4.5.2.7 Leakage. After successful completion of the above tests, turn the
truck on its side on a clean paper surface. Allow the truck to remain in this
position for 30 minutes. Examine the actuator reservoir, the hydraulic lines
and the paper surface for oil and grease spots. Evidence of any leakage shall
constitute failure of this test.
4.5.2.8 Rolling force. Weigh the truck carrying a rated load. Place the
truck on a dry, smooth, level concrete surface of sufficient length to conduct
the test. Couple the truck to an industrial-type tractor through a tension
dynamometer. Accelerate the tractor-truck combination to a minimum speed of 2
mph (3.2 km/hr). Determine the maximum reading of the dynamometer while the
truck is being towed at 2 mph (3.2 km/hr).Deactivation of deadman brake is
premissible in order to perform this test. Nonconformance to 3.6.7 snail
constitute failure of this test.
4.5.2.9 Endurance. The truck shall be pulledor towed at a speed of 1.5 (2.4)
to 2 miles per hour (3.2 km/hr) in a 50-foot (15.2 m) diameter circle for a
period of 6 hours with the rated load on the forks. The minimum number of
times around the circle shall be 50 in 1 hour. The circle shall have two 3/4
inch (19 mm) high by 2 (50 nun) inch wide iron,wood,concrete or steel blocks as
obstacles, 180 degrees apart and over which the truck shall be pulled each time
around the circle without reduction in speed. At the end of each hour the
forks shall be completely raised and lowered 10 times, with the load on the
forks. The complete cycle shall be repeated five times with the direction of
travel around the circle reversed each hour. There shall be no repair or
adjustments allowed during the complete endurance test. The use of steel
wheel(s) or replacement of polyurethane tires as required during endurance
testing is acceptable.Deactivation of deadman brake is permissible in order to
perform this test. Inability of the truck to be fully operational after
completion of the test shall constitute failure of this test.
4.5.2.10 Salt fog. The truck shall be tested in accordance with MIL-STD-810,
Test Method 509. At the option of the supplier, all the individual components
may be tested separately instead of the assembled truck. If the assembled
truck is tested, following the start of exposure to salt fog no function or
component of the truck shall be operated prior to completion of the exposure
and drying periods. The following details required by MIL-STD-810 are
designated.
(a) Preparation of the assembled truck prior to exposure to salt fog
shall be in accordance with the preparation of test item procedure
specified in MIL-STD-810, Test Method 50% All exterior surfaces of the
truck, including piston rods which shall be at maximum extension, shall be
cleaned and shall be exposed to salt fog throughout the test. Components
such as bearings which are normally lubricated shall be lubricated prior
to the test. If the truck is tested as unassembled components, those
surfaces and assemblies which are normally lubricated may be lubricated
prior to test. All other surfaces including piston rods whidh shall be at
maximum extension shall be cleaned and exposed to salt fog as described
above. Pretest and post-test data required of the assembled truck,
whether assembled `before or after salt fog exposure, shall be in
accordance wit-n 4.5.2.2, 4.5.2.3, 4.5.2.5, 4.5.2.6, 4.5.2.7, 4.5.2.8,
4.5.2.12. Evidence of harmful corrosion or failure to meet performance
requirements shall be cause for rejection.
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