MIL-J-26149E
4.6.7.1 Low temperature. The jack shall be subjected to the low temperature test in accordance with method 502, procedure I. At the end of
the exposure period and with the temperature maintained, the jack ram shall be raised to its maximum extension and pumped until the bypass relief valve
operates. The lowering valve shall be opened and the ram shall retract with not more than 50 pounds force (222 N) applied to the ram. For this test, the
jack shall be serviced with hydraulic fluid conforming to MIL-H-81019. The
number of full strokes necessary to fully extend the ram shall be recorded at both 70°F (21°C) and -65°F (-53.9°C). The full strokes required to fully
extend the ram at -65°F (-53.9°C) shall be not more than double the strokes
required at 70°F (21°C).
4.6.7.2 High temperature. The jack shall be subjected to the high temperature test in accordance with method 501, procedure I. At the end of the exposure and with the temperature maintained, the jack shall be subjected to the tests specified In 4.6.3.1 and 4.6.3.2.
4.6.7.3 Salt fog. The jack shall be subjected to the salt fog test in accordance with method 509, procedure I with the ram(s) and screw extension fully extended. At the end of thiS test, the jack shall be subjected to one cycle of the endurance test of 4.6.5 after the surface deposits are washed away and the jack wiped dry and exposed threads coated in accordance with applicable handbook.
4.6.7.4 Dust. The jack shall be subjected to the dust in accordance with method 510, procedure I with the ram(s) and screw extension fully extended.
At the end of this test the jacks shall be subjected to one cycle of the
endurance test of 4.6.5 after the surface deposits are washed away and the jack wiped dry. The exposed threads shall be coated in accordance with the applicable handbook.
4.6.8 S erviceability.
The jack shall be Inspected and evaluated from the
standpoint of ease of maintenance, servicing. and operation. Particular attention shall be given to maintenance with a minimum number of tools;
maintenance with general-purpose tools and equipment, servicing and operation
by personnel wearing heavy gloves, and provisions made to prevent accumulation of contamination, residue, dirt, snow, ice, et cetera, that may hinder servicing and operation.
4.6.9 Final inspection. Upon completion of all tests, the jack shall be disassembled to the maximum practical extent for a thorough examination of all parts for corrosion, excessive wear or deformation. Any evidence of
corrosion, distortion, or deviation from the dimensions recorded in 4.6.2 shall be cause for rejection.
4.6.10 Reliability demonstration and test. Satisfactory completion of all tests specified herein without failure demonstrates compliance with the quantitative reliability requirements of this specification.
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