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Figure 4-29.  Soldering Sleeve Bushing to Bellows
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Stripping Insulated Wire.
TM 9-254 4-13. Soldering Techniques - Continued (8) When the temperature of the sleeve bushing (3) and the bellows (5) rises to a point that will cause the solder to melt and flow into the joint, discontinue heating with the torch and apply solder (2) to form an even-continuous fillet around the sleeve bushing and the bellows. NOTE Heat  applied  to  the  bellows  during  the  soldering  operation  will  cause  the  bellows  to  change physical length. (9) After the solder joints have cooled, measure the distance from the shouldered shaft (1) at the threaded end, to the sleeve bushing (3).  The distance measured (A) must be between 0.468 and 0.500 inches. CAUTION Do not score the sleeve bushing when using pliers to make adjustments to the bellows. (10)  If the measurement taken in step (10) is not within tolerance, reheat the bellows (5), do not apply heat to the solder joints.  Grip the sleeve bushing (3) with a pair of pliers and either compress or stretch out the bellows. (11)  Measure the distance (A) again and if necessary repeat step (10) above. (12)  Allow  the  bellows  assembly  to  cool  completely  and  then  remove  all  flux  residue  from  the  solder  joints with a medium stiff bristle brush dipped in alcohol. 4-14. Desoldering Techniques. Solder   may   be   removed   from   conductors   and   terminals   by   mechanical   vacuum   devices,   wicking   with   a   stranded conductor, or shielding braid and flux.  The stranded conductor or shielding braid method will be discussed in this section. (1) A  well-tinned  soldering  iron  tip  shall  be  used  to  melt  solder  connections  when  conductor  wires  are removed from component terminals. (2) To  remove  conductors  from  solder  joints,  preclean  joint  to  be  desoldered  with  a  noncorrosive  solvent such as alcohol. (3) Choose a size of stranded wire or shielding braid that is large enough to do the job properly but not too large.  The larger the stranded wire or shielding braid, the more heat required to desolder the joint and a greater possibility of damaging the circuit. (4) Dip approximately 1/2 inch of the stranded wire or shielding braid into liquid flux or use a commercially available desoldering wick that already contains the flux (app B).  Shake off any excess. Change 4  4-35

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