MIL-J-26149E
4.6.5 Endurance test. The endurance test shall be conducted at an ambient room temperature of 70° ±1O°F (21° ±5°C). The test shall consist of
200 cycles of raising a load equivalent to the rated capacity vertically, and
60 cycles of raising the same load with 15 percent of rated capacity load being applied horizontally to the top of the jack through the jack pad socket
adapter. One cycle shall consist of raising the ram from collapsed height to
the fully extended position and return to the collapsed position. The horizontal load shall be graduated from zero in the collapsed position to 15 percent of rated jack capacity at the fully extended position, Failure of any part of the jack during this test shall be cause for rejection. At the end of the test, the force required at the end of the pump handle extension to raise the rated capacity load shall not exceed 100 pounds.
4.6.5.1 Vertical lift test. The vertical lift test shall consist of 200 cycles of vertically raising and lowering a load equivalent to the rated capacity. One cycle shall consist of raising the ram, under load, from the fully retracted position to the fully extended position and return to fully retracted position. The load shall be applied tito the jack through the jack pad socket adapter. Failure of any part of the jack as a result of this test shall be cause for rejection.
4.6.5.2 Dynamic side load test. The dynamic side load test shall consist of 60 cycles of vertically raising and lowering a load equivalent to the rated capacity with a graduated 15 percent of rated capacity load applied horizontally to the top of the jack through the jack pad socket adapter in accordance with 4.3.2. If the jack has a screw extension, it shall be
retracted for this test. The horizontal load shall be graduated from zero at
the collapsed position to 15 percent of rated jack capacity at the fully extended position. Failure of any part of the jack as a result of this test shall be cause for rejection.
4.6.5.3 Release valve test. The jack shall be raised to the fully extended ram position and while supporting its rated capacity load the release valve shall instantaneously open fully. This will allow the jack to retract
at its maximum rate. The dumping or safety valve shall vent the air so that no damage to the reservoir or the associated plumbing shall be noted (i.e. pressure increase in the reservoir shall be minimal). This test shall consist of five (5) cycles and may be combined with other tests.
* 4.6.6 Mobility test. Jacks having mobility features as specified in
3.6.6 shall be tested for type I, class lb mobility (maximum speed 3 mph (4.8 km/h)) as specified in MIL-STD-1784 except that the slope angle shall be 15" maximum.
4.6.7 Environmental tests. The following environmental tests shall be conducted in accordance with the specified procedures of MIL-STD-810.
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