TM 10-3930-671-24 12. Remove  the  end  cover  only  if  there  is  need  for further  inspection  and  cleaning  of  contaminants in the valve. To remove, loosen and remove the fasteners   and   lift   the   end   cover   off   the   valve body. Remove the O-ring seals. Cleaning, Inspection and Repair     1. Discard  all  old  seals.  Wash  all  parts  in  a  clean mineral  oil  solvent  and  place  them  on  a  clean surface for inspection. 2. Carefully  remove  any  burrs  by  light  stoning  or lapping.  Be  sure  there  is  no  paint  or  burrs  on mating surfaces of valve bodies. 3. Inspect   valve   spools   and   bores   for   burrs   and scoring.  If  scoring  is  not  deep  enough  to  cause objectionable    leakage,    the    surfaces    can    be stoned or polished with crocus cloth. If scoring is excessive,    valve    body    and    spool    must    be replaced.    Check    each    valve    spool    for    free movement in its bore. 4. Inspect  the  relief  valve  for  damage.  Check  the relief valve for smooth free movement in its bore. The  valve  poppet  should  move  easily  from  only the force of its own weight. 5. Inspect  the  valve  body  to  make  sure  it  has  not been physically damaged. Examine all threads to be   sure   they   are   clean   and   not   damaged   or burred. Inspect all bores and poppet seats. 6. All  springs  should  be  free  of  corrosion  and  not broken or bent. 7. If parts must be left unassembled for a period of time   or   overnight,   cover   with   a   lint-free   clean material. F-469