SERVICE MANUAL DESCRIPTION Rigid  (copper)  tubing  and  fittings  of  different  sizes have been used to connect different air devices in the air system.   However,   flexible   hoses   and   nylon   tubing   is gaining increasingly wide usage in place of copper piping on IH vehicles. FLEXIBLE HOSE Any size or length of hose can now be made locally for service requirements. The   hose   is   constructed   of   a   seamless   synthetic rubber  lining  or  tube  reinforced  with  one  fabric  braid  of high  tensile  steel  wire  which  is  covered  with  a  synthetic rubber-impregnated oil-resistant fabric braid. These  hoses  can  be  used  for  air  systems  and  air brake systems, except air line from air compressor to air reservoir,    where    the    temperature    will     exceed     167 degrees C (300 degrees F). The fittings used at the ends of the flexible hose are of  the  swivel  type,  such  as  that  shown  in  Fig.  1.    The swivel    end    permits    one    end    of    the    hose    to    be disconnected and not disturb the complete hose. Fig. 1 Flexible Hose Fitting 1Nut 2Fitting 3Hose Socket CAUTION Do not try to mix different type hoses and hose fittings. In some cases the hose and hose fittings may seem to fit, but   the   ends   may   not   hold   up   under   pressure   which could result in loss of air while vehicle is being operated. If   in   doubt   as   to   the   identification   of   the   hose   and/or fittings which are being repaired, use new IH components to make up a new hose assembly. HOSE ASSEMBLY INSTRUCTION When  the  assembly  procedure  in  making  up  a    hose  is being  performed,  each  step  should  be  finished  carefully to assure proper connections at the hose ends. 1. Remove the hose fitting and nut from socket and hose. Fig. 1 illustrates the swivel hose fitting. So that  the  swivel  nut  and  fitting  can  be  removed from   the   hose   and   socket   assembly,   install   a pipe   adapter   in   the   swivel   nut   and   tighten   it, locking the swivel joint assembly (nut and fitting). The swivel nut and fitting can now be turned out of the hose using a wrench. 2. Separate the hose from the socket. 3. Repeat steps 1 and 2 for the removal of second end. 4. Use a fine-tooth hack saw to cut hose to desired length  (Fig.  2).  Use  care  in  supporting  the  hose so  as  not  to  crush  or  damage  the  hose  during the cutting operation. Fig. 2 5. Lightly clamp the hose socket in a vise. 6. Screw  end  of  new  hose  into  socket  until  hose bottoms  in  fitting  (turn  hose  counterclockwise). Then back off hose 1/4 turn (Fig. 3). Fig. 3 7. Reposition hose and socket in the vise as shown in    Fig.    4.    Lubricate    hose    socket    and    fitting threads. CTS-4079 - CHAPTER XII - Page 3