TM 5-3895-374-24-2 4.3.2 SEAL STRIPS Seal  strip  replacement  procedure  is  the  same  for  both Standard Duty and Heavy Duty Roto-Flo Feeders. A. Remove the feeder from the installation B. Remove the chain from the feeder sprocket. CAUTION Neoprene   and   Urethane   seal   strips are  installed  on  the  trailing  edge  of the   rotor.      Teflon,   brass   and   steel strips   are   installed   on   the   leading edge   of   the   rotor.      New   seal   strips must be installed in the same edge as the original seal strips. C.   Turn the feeder sprocket in a clockwise direction (facing the drive end) until one seal is completely clear. D.   Unbolt the seal strip holder and remove old seal strip. E.   After  brushing  off  loose  material  from  the  tip  of the rotor and behind old seal, fit in the new seal strip.    The  Neoprene  and  Urethane  seal  strips have  oversized  holes  furnished  so  that  the  new seal  strip  can  be  placed  as  high  as  possible  on the rotor. The seal strip should be slightly above the feeder inlet so that it will curve back from the direction  of  rotation.    Hard  seal  strips  such  as brass or steel should be installed with clearance. See 4.3.4. F. Install    seal    strip    holder    and    turn    down    cap screws    finger    tight    Tighten    all    screws    with wrench. G.   Advance  the  rotor  to  the  next  position  either  by turning    the    feeder    sprocket    by    hand,    or    by placing a pipe wrench on the sprocket hub.  DO NOT use pipe wrench on rotor shaft. You  will  note  that  the  feeder  will  become  progressively harder  to  turn  with  the  installation  of  each  new  flexible seal, but this tightness is a must if the feeder is to have an  air  tight  seal.    A  few  drops  of  oil  on  each  seal  will reduce the friction and allow the rotor to be turned easier. 4.3.3.  LIP SEALS Roto-Flo  Standard  Duty  Feeders  are  equipped  with  lip seals. A.   After   removing   the   old   seal,   remove   all   loose material and make sure there are no burrs in the seal cavity. B.   Put  a  light  film  of  oil  or  grease  on  the  lip  at  the seal so that it slides onto the shaft easily. C.   Press  the  seal  into  the  seal  cavity  with  the  lip pointing    toward    the    inside    of    the    headplate. Press it in until it bottoms out. D.   Press the bearing back in the same way it came out  Le.    Set  screws  toward  the  outside  of  the headplate. E.   When  the  lip  of  the  seal  reaches  the  diameter that  it  rides  on,  gently  rotate  the  headplate  onto the shaft.  It is important that you don’t invert the lip of the seal and pop off the spring. F.   Bolt  the  headplates  in  place,  set  the  clearances as  specified  in  Section  4.3.4.    or  as  previously set, and then lock the bearing set screws. 4.3.4.  ROTOR REPLACEMENT Roto-Flo Feeders standard rotor end and tip clearance is .007-.008   inches.      The   actual   clearance   for   a   given feeder may be different due to special applications such as  abrasive  service  or  high  temperature.    Consult  the factory for rotor replacement to ensure proper clearances for a specific feeder. CAUTION After completion of maintenance work, reinstall the Roto-Flo Feeder in the    system    making    sure    that    the sprockets and drive chain are properly  aligned  and  the  drive  guard is in  place.    Reconnect  any  air  purge and vent piping. page 3 - 731