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Section II.  GENERAL MAINTENANCE OF OPTICAL COMPONENTS
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 9-20.  Vacuum Suction Adapter
TM 9-254 9-3.  Cleaning Optical Components - Continued Table 9-1.  Special Tools and Supplies Nomenclature Description Alcohol, denatured 0E760 Acetone, technical Lens tissue 7-1/2 X 11 inch sheets, NNN-P-40 Stainless steel pump dispenser Lens cleaning compound Detergent solution, MIL-C-43454 Syringe Bulb type, 6515-X29-3340 Artist brush Number 6 Suction adapter Fabricated, teflon or bakelite Lens tongs Applicator Fabricated, wood or fiberglass Rapping stick Lens tray (1) For  initial  cleaning  of  a  component  after  removal  from  an  instrument  or  lens  cell,  use  a  syringe  or  a  camel  hair brush  to  remove  any  dirt  which  may  have  fallen  on  the  lens  during  removal.    Then  apply  alcohol  to  a  pad  of cheesecloth or lens tissue and clean the component thoroughly.  A light pressure should be applied to the surface of the component when cleaning.  Using excessive pressure could possibly damage the coating or put scratches in the glass. (2) For final cleaning prior to installation of a lens in a cell or instrument, place the lens on a lens holder or a vacuum suction  adapter  (Fig.  9-20).    Wrap  a  small  piece  of  lens  tissue  around  and  over  the  end  of  a  wood  or  fiberglass applicator (Fig. 9-21).  Make sure you leave a cushioned tip over the end of the applicator so that it does not mar the lens surface.  Moisten the lens tissue with acetone and proceed to clean the lens by rotating the applicator in a  circular  motion  starting  at  the  center  of  the  lens  and  cleaning  outward  to  the  edge  of  the  lens  (Fig.  9-22). Repeat  the  above  operation  until  the  lens  is  free  of  dirt.    Lift  lens  from  suction  adapter,  clean  the  top  of  the adapter, turn lens over and repeat the cleaning operation on the other surface.  Before inserting the lens in its cell be  sure  the  cell  has  been  cleaned  of  any  sealant,  washed  in  Dry  Cleaning  Solvent  (exposed  metal)  or  general purpose detergent (painted surface) and dried.  Then properly orientate the lens and insert it into its cell.  Hold the cell up to the light and visually inspect for dirt or lint.  If dirt or lint is present on the lens, use vacuum with proper fabricated adapter (fig 9-23) or lens tissue to remove the contamination. 9-14  Change 6

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