TM 5-3895-383-24 O-Ring Face Seal Fittings SMCS Code:  7553 Illustration 2 O-ring face seal fittings (1) O-ring face seal fitting.  (2) O-ring groove.  (3) Nut for the O-ring  face  seal.    (4)  O-ring  seal.    (5)  Straight  thread  O-ring fitting. Table 6 Ferrous Straight Thread O-Ring Fitting Thread Size Inch Standard Torque 9/16 - 18 25 3 Nm (18 2 lb-ft) 11/16 - 16 37 4 Nm (27 3 lb-ft) 13/16 - 16 54 5 Nm (40 4 lb-ft) 1 - 14 86 8 Nm (65 6 lb-ft) 1 13/16 - 12 125 15 Nm (90 11 lb-ft) 1 7/16 - 12 165 15 Nm (120 11 lb-ft) 1 11/16- 12 200 20 Nm (150 15 lb-ft) 2 - 12 225 20 Nm (165 15 lb-ft) Fitting Installation SMCS Code:  7553 NOTE: The   tightening   sequence   of   the   fasteners   that attach  a  tube  assembly  or  hose  assembly  to  the machine  is  very  critical  to  the  proper  function  of the  machine.    The  sealing  surfaces  of  the  tube assembly  or  hose  assembly  should  be  secured squarely.        The    sealing    surfaces    of    the    tube assembly  or  hose  assembly  should  be  tightened to the serviced component (control valve, cylinder,   hydraulic   motor,   etc).      Perform   this procedure   prior   to   the   final   tightening   of   any clamps  or  clips  that  are  used  in  order  to  fasten the  tube  assembly  or  the  hose  assembly  to  the machine. Installation of the Hydraulic Line 1. For a metal tube to hose installation, install the tube  and tighten all bolts finger tight at the rigid end. 2. Install the hose and tighten all bolts finger tight. 3. Put the hose in a position so that the hose does not make contact with the machine or with another hose. 4. Tighten  the  bolts  on  both  connections   to   the   specified torque. 5. Start the engine. 6. Move the implement control levers to all of the positions. 7. Look   at   the   hose   during   movement   of   the   implement. Ensure that the hose is not in contact with the machine or other hoses.  Shut off the engine. 8. If  necessary,  put  the  hose  in  a  new  position  so  that  the hose will not make contact when the machine implement is moved. Assembly of the Fittings with Straight Threads and O-Ring Seals This type of fitting is used in many applications.  The tube end of the fitting will be different in design so that the fitting can be used   in   many   different   applications.      However,   the   same installation  procedure  for  the  fitting  can  be  used.    If  the  tube end  of  the  fitting  body  and  the  illustration  (elbow  or  straight body)  match,  it  is  necessary  to  assemble  the  sleeve  on  the tube before connecting the tube to the end. 4-6