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TM 10-4320-351-14 (14) Remove and discard the shaft seal housing O-ring (18). (15) Inspect and clean O-ring grooves as required.  Any debris or foreign material may prevent the O-rings from seating properly. b. Installation. (1) Lubricate lightly and install O-ring (18) in vane pump housing (19). (2) Lubricate lightly and install O-ring (14) on shaft. (3) Lubricate stationary seal (10) and push into shaft seal housing (4) so that elastomer portion seats against housing. (4) Install  rotating  spring  (12)  on  spacer  (13),  and  install  on  shaft  so  that  lipped  portion  of  seal  faces  out  (to interface with stationary seal installed in previous step). (5) Apply  anti-seize  compound  to  the  five  shaft  seal  housing  screws  (8).    Place  shaft  seal  housing  (4)  over shaft with weep hole facing down and mounting holes aligned, hold housing down against spring pressure, and install the five screws (8) and flat washers (9) that secure shaft seal housing (4) to vane pump housing (19). (6) Rotate shaft by hand to check freedom of rotation.  Some rubbing at the inlet is normal but if the shaft binds or will not turn, remove shaft seal housing (4) and check rotating shaft seal (11) for proper assembly. (7) Install washer (7) and shaft nut (6) on shaft hand tight. (8) Install splined flexible coupling adapter (5) on pump shaft.  Tighten set screw against shaft key (20). NOTE The shaft nut (4) must be torqued to a specific value to provide the proper tension on  the  rotating  shaft  seal  (11).    However,  a  standard  socket  on  a  torque  wrench cannot be used.  A crow foot adapter, as shown in the illustration below, will allow access to the nut but adding the adapter will also cause the torque reading on the wrench to be different from the actual torque applied to the nut.  To calculate the torque  value  to  be  indicated  when  the  required  torque  is  known,  perform  the following procedure: 1.  Measure the distance L1 on the torque wrench to be used. 2.  Install the crow foot adapter and measure the distance L2. 3.  Divide L2 into L1. 4.    Multiply  the  quotient  by  the  torque  specified  for  the  nut.    The  product  is  the  torque value   that   will   be   indicated   on   the   wrench   when   the   specified   torque   has   been reached on the nut. 5-11

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