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Page Title: Section III. GENERAL MAINTENANCE INSTRUCTIONS
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para 5-29 para 5-28 para 5-31 para 6-3 para 6-8 para 5-20 para 5-17 para 5-29 Malfunction .— Table    5-1.    Troubleshooting-Continued Probable    Cause I Corrective Action I Section   III. GENERAL   MAINTENANCE   INSTRUCTIONS 5-6.   General This  section  contains  general  repair  instructions which   would   otherwise   have   to   be   repeated   several times. 5-7.   Refrigeration   S y s t em a.    Opening    System. When   the   refrigeration system   must   undergo   maintenance   that   requires   the system   to   be   opened   for   removal   of   parts,   the system   must   first   be   discharged   and   purged   (para 6-3).   After   the   repair   has   been   made   and   all soldering   completed,   the   system   must   be   charged (para   6-3)   and   tested   for   leaks. b.   Removal   of   Parts.   It  may  be   necessary   to remove  some  tubing  and  fittings  with  a  part  that  is to  be  replaced.  The  tubing  and  fittings  can  then  be removed  from  the  defective  part  and  installed  in  the new   part.   Care   should   be   exercised   in   opening joints   or   resoldering   to   prevent   damage   to   other parts  of  the  air  conditioner. c.  Brazing.   Braze   copper   to   copper   joints   with silver  solder  type  3,  4  or  6A  specification  QQ-S-561 and  copper  to  brass  or  copper  to  steel  with  type  4  or 6A   specification   QQ-S-561   per   MIL-B-7883. Solder   melting   point   is   1160°F.   All   brazed   or soldered  joints  shall  be  made  with  an  atmosphere  of inert   gas   to   prevent   internal   oxidation. 5-8.   Insulation   and   Gaskets Replace  damaged  insulation   and  gaskets.  Cement loose  insulation. 5-9.   Hardware Replace   any damaged   screws,   washers,   lock washers   or   nuts.   Use   screws   of   correct   length   to hold   parts   securely.   In   some   applications   screws that  are  too  long  may  hit  bottom  before  the  head  is tight  against  part  it  is  to  hold  or  may  cause  damage to   the   threads   or   other   parts. 5-10.  S h i ms Be   sure   to   remove   all   shims   where   used.   Keep shims   together   and   identify   them   as   to   location. 5-11.    Repairing    Damaged    Threads Damaged   threads  should  be  repaired  by  use  of  a thread  restorer  or  by  chasing  in  a  lathe.  Internal threads  should  be  repaired  with   a  used  tap  of  the correct   size. If   threads   cannot   be   satisfactorily repaired,   replace   the   part. 5 - 1 2 .    R e p a i r   o f     D a m a g e d     M a c h i n e d     a n d Polished    Surfaces Smooth   rough   spots, scores,   burs,   galling,   and gouges   from damaged   machined   and   polished surfaces   so   that   part   will   efficiently   perform   its normal   function.   The   finish   of   the   repaired   part   is to   approximate   that   of   the   original   finish.   In performing   any   of   these   operations,   critical dimensions   must   not   be   altered. 5-13.   Removal   of   Rust   or   Corrosion Remove   corrosion   from   all   parts   of  material.   To remove   rust   or   corrosion,   use   wire   brush,   abrasive cloth,   sand   blast,   vapor   blast   equipment,   or   rust remover   except  on  highly   polished   surfaces.   O n these  surfaces.  buffing  or   the  use  of  crocus  cloth  is recommended. 5-14.   Tubes  and   Fittings Check   tubes   and   fittings   for   cracked   or   split condition.   Check   tubing   for   kinks.   Replace defective   fittings.   Replace   damaged   tubing   with tubing  of  same  size.  Take  care  in  making  bends  in tubing   to   prevent   kinking   of   tubing.   All  tubing  and 5-4

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