TM 10-3930-671-24 20. Remove seal from housing. 21. Remove set screw from housing. 22. Screw a 1/8" - 24 NC machine screw into end of check ball seat.  Then pull on screw with pliers to lift seat out of housing. 23. Remove two (2) seals from check valve seat. 24. Tip housing to remove check ball and check ball retainer. Parts Inspection Inspect   all   parts   for   damage,   cracks,   broken    parts, damaged threads, corrosion or erosion of surfaces, worn spots, nicks, or scratches. Check all mating surfaces.  Replace any parts that have scratches or burrs that could cause leakage.  Discard all old seals and replace with new ones. Clean all metal parts in clean solvent.  Blow dry with air. Do not wipe dry with cloth or paper towel because lint or other matter can get into the hydraulic system and cause damage.  Do not  use  a  coarse  grit  or  try  to  file  or  grind these parts. If parts are  left  exposed,  cover  them  with  a  clean  cover to prevent airborne dust from collecting on them. Steering Valve Reassembly NOTE Lubricate  all  seals  (with  exception  of new     quad     ring     seal)     with     clean petroleum  jelly  such   as   Vaseline.Do not  use  excessive  lubricant  on  seals for meter (gerotor) section. Make sure all parts are clean and free of dust.  Before assembly, lightly coat all internal metal parts with oil. 1. Use  a  needle-nosed  pliers  to  lower  check  ball retainer into check valve hole of housing.  Make sure  retainer  is  straight  (not  tilted  on  edge)  in housing. 2. Install check ball in housing. 3. Lubricate 5/8" diameter seal and 7/16"  diameter seal.  Install seals on check ball seat, as above. 4. Lubricate  check  ball  seat  and  seals  thoroughly before installing seat in housing.  When installing seat, do not twist or damage seals.  Install check ball seat in housing; insert open end of seal first. Push check ball seat into bottom of hole. 5. Install  set  screw.    Use  a  5/1  6"Allen  wrench  to torque   set   screw   to   100   lb-in   (11   N•m).    To prevent  interference  of  parts,  make  sure  top  of set   screw   is   slightly   below   housing   mounting surface. 6. Assemble spool and sleeve carefully so that the spring slots line up at the same end.  Rotate spool while sliding parts together.  Some spool and sleeve sets have identification  marks;  align  these  marks.    Test  for  free rotation.    Spool  should  rotate  smoothly  in  sleeve  with finger tip force applied at splined end. F-415