MIL-DTL-197L
3.9 Bearings, ball, airframe, antifriction, SAE AS7949; bearings, ball, rod end, double
row, self-aligning, SAE AS6039; and bearings, roller, needle, airframe, antifriction, inch,
SAE AS39901.
3.9.1 Environment and process cleanliness of cleaning and drying areas. The presence
of dust and dirt-producing sources, such as cartons or trash barrels, shall be kept to a minimum.
Smoking, eating, and drinking shall not be permitted in the cleaning and drying areas. Cleaning
and drying areas are defined as those areas within a 10-foot radius of the cleaning and drying
equipment, including aisles.
3.9.2 Preservation and unit packaging area environment and process control. The
working area shall be well illuminated. The temperature shall be maintained at 75 ±10 °F
(24 ±6 °C) with a maximum R.H. of 75 percent. Area control shall be in accordance with 3.9.1.
Bearings shall be preserved and transferred to the unit packaging area in a continuous process
(see 3.10.1). Delays shall be minimized. Bearings waiting to be preserved or lubricated shall be
kept in covered containers as necessary, to avoid contamination. Bearings shall be reprocessed if
they become contaminated. Preserved bearings shall be transferred to the unit packaging area.
The unit packaging area shall be well illuminated, clean, and dry. The presence of dust and dirt-
producing sources shall be kept to a minimum.
3.9.3 Cleaning. The bearings shall be cleaned by any process or combination of
processes that will accomplish thorough cleaning without damage to the item. Agitation tanks
and commercial filtration systems may be used. Spray washes and ultrasonic cleaning are
permitted. Bearings shall be thoroughly cleaned and shall be free of any chemical or particulate
residue that will have a detrimental effect on the life of the bearing prior to lubrication and
wrapping. Written procedures shall be established for planned maintenance and checks of the
cleaning and drying systems. At a minimum, the procedures shall include machinery
cleanliness, filter maintenance, cleaning fluid quality and cleanliness, and the frequency of such
maintenance actions and checks.
3.10 Methods of preservation (see 6.2).
3.10.1 Military preservation. The military preservation procedure shall be accomplished
without interruption. When interruptions are unavoidable, temporary covers or enclosures shall
be provided to insure against contamination or deterioration of items.
3.10.1.1 Cleaning and drying. Open non-lubricated bearings shall be cleaned and dried
by any process or combination of processes that will accomplish thorough cleaning and drying
without damage to the item. Closed bearings shall not be subjected to any process injurious to
the bearing's internal lubrication.
3.10.1.2 Preservative applicability. When contact preservatives are required to protect
the bearing, the preservatives shall be as specified in 3.3.4. The required preservative shall be
uniformly applied by any applicable procedure that permits the preservative to coat all the
necessary surfaces (see 3.3.4.7).
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