MIL-DTL-6193D
4.7.7 Endurance (see 3.5.7). Universal joints when subjected to endurance testing shall meet the
requirements of 3.5.7. The following details shall apply:
a. Test specimens:
(1) Class 1 universal joints before starting the endurance test, shall be submerged in
lubricating oil conforming to MIL-PRF-7870.
(2) Class 2 universal joints test specimens shall be subjected to the endurance test with
lubricant retaining covers in place.
b. Test equipment shall be of such design and construction that the test specimen will be free
from inadvertent end loads during the entire test. The following details shall apply:
(1) A means shall be provided to avoid high starting torque loads.
(2) The test equipment shall be a smooth-running mechanism free from vibration and shock
loads.
(3) After startup, the dynamic torque load applied shall be constant.
c. Testing:
(1) Forced cooling shall be used during the test.
(2) The universal joint shall be continuously operated at 120 rotations per minute under the
applicable dynamic torque loads and for the lengths of run shown in table I, with the
angle shown on figure 1 equal to 15°.
4.7.8 Lubricant retention (see 3.5.8). Universal joints subjected to lubrication retention shall meet the
requirements of 3.5.8. The following details shall apply:
a. Test specimens shall be universal joints with lubrication covers that have successfully passed
endurance testing specified in 4.7.7.
b. Test specimens shall be exposed to -65 °F (-53.89°C) for 24 hours.
c. The universal joints shall then operated at angle "A" of 20° (see figure 1) for 1 hour at 3
rotations per minute.
d. The temperature shall then be raised to 160°F (71.11°C) for 160 hours and the universal joint
operated at angle "A" of 20° (see figure 1), for 1 hour at 3 RPM.
e. Failure of the lubrication retaining cover shall also be considered failure of the universal joint.
4.7.9 Ozone (see 3.4.5.1). Unless specified otherwise, all rubber or elastomeric components used on
the universal joint when exposed to ozone shall meet the requirements of 3.4.5.1. Rubber or elastomeric
components shall be tested in accordance with ASTM D1171, method A exposure rating, utilizing ozone-
chamber exposure method B with 70-hour exposure time.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house
contractor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Controls Point's
packaging activities within the Military Service or Defense Agency, or within the military service's system
commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
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