TM 10-3930-671-24 Disassembly 1. Take  note  that  the  cylinder  has  right-hand  and left-hand   glands.        Mark    the    glands,    cylinder barrel   and   cylinder   rod   for   installation   in   the same position at reassembly. 2. Carefully  clamp  LH  gland  end  in  a  vise  to  hold while disassembling. 3. Loosen and remove the thru-fastener nuts on the RH  gland  (single  nut)  end.    Hold  thru-fastener from turning with wrench on inner nut on LH end. Remove the thru-fastener threaded rods. 4. Remove  RH  gland  from  cylinder  barrel.    Use  a soft-faced   hammer   to   tap   on   the   gland   and separate   it   from   the   cylinder   barrel.      Pull   the gland off the piston rod. 5. Remove   the   piston   &   rod   assembly   from   the cylinder barrel. 6. Remove the cylinder barrel from LH gland. 7. Remove     the piston seal and piston seal expander from piston.  Replace with new parts at assembly. 8. Remove   the   gland   seal,   rod   wiper   and   gland packing  from  gland  and  discard.    Replace  with new seals at assembly. Inspection 1. Carefully  clean  all  parts  in  an  approved  solvent and place on a clean surface. 2. Check the piston for chips, cracks and looseness.    Check  the  piston  rod  for  damage and    bending.        Look    for    scratches,    grooves, gouges,  pitting,  corrosion  or  other  evidence  of unusual  wear.    Minor  surface  damage  may  be repaired by use of fine abrasion cloth or stoning. Deeper    damage    will    require    replacement    of piston rod assembly. 3. Check piston rod ends and connecting pin holes for  damage.    Make  sure  the  threads  on  thru- fasteners are undamaged. 4. Carefully inspect the cylinder barrel internal bore for wear,  scratches,  corrosion  or  other  damage. Check the outside for damage. 5. Inspect   the   cylinder   ports   and   threads   in   the glands to be sure they are free of contamination and that the threads are not damaged. 6. Check  the  seal  bores  and  groove  of  the  glands to   be   sure   they   are   undamaged.      Check   for corrosion and pitting. 7. Put a light coating of hydraulic fluid on all parts. If  parts  are  to  be  left  disassembled  for  a  period of  time,  e.g.    overnight,  they  should  be  covered with a clean cloth. Reassembly NOTE • Be sure inside of cylinder and all parts   are   clean   and   lubricated before starting reassembly. • Assemble piston and glands into cylinder     carefully     to     prevent damage  to  seal  lips  and  0rings. Seals   may   be   lubricated   with hydraulic oil to assist assembly. All parts should be reassembled in  the  same  position  as  marked at disassembly. 1. Install new piston seal expander and piston seal on piston. 2. Install new gland packing and rod wiper in gland end and new gland seal on each gland. CAUTION Be  sure  the  gland  packing  and  rod seal    are    installed    in    the    correct direction   or   damage   to   equipment could result. 3. Carefully  assemble  piston  and  rod  into  cylinder barrel. 4. Assemble   glands   onto   piston   rod.      Check   for correct position of RH and LH parts. 5. Assemble   glands   into   cylinder   barrel.      Again check for correct positioning of RH and LH parts and cylinder ports. 6. Assemble thru-fasteners into glands.  Hold thru- fasteners  from  turning  with  wrench  on  outer  nut on  LH  end.    Install  and  tighten  fastener  nuts  to torque spec: 30-33 lb-ft (40-45 N•m). NOTE Steer  cylinder  mounting  surfaces  on glands  to  be  parallel  within  .012  in. (0.3 mm). 7. Check the correct positioning of parts and make sure  the  cylinder  rod  and  piston  move  freely  in the cylinder. Bench Test Connect  pressure  source  in  turn  at  each  port.    Extend piston rod at each side and test with internal pressure of 2000 psi.  At this pressure no leakage must occur. F-443 (F-444 blank)