TM 5-3895-374-24-2 4. Remove packing gland nuts. 5. Tap shaft forward approximately 1/2 inch and remove pair of half round rings under inner bearing spacer collar.  There is no half round rings on H and HL size pumps. 6. Carefully remove rotor and shaft to avoid damaging bracket bushing. 7. Remove packing gland from side of bracket. 8. Loosen  setscrews.    Two  on  H  and  HL  size  pumps,  four  on all  other  sizes.    With  a  spanner  wrench,  remove  both  end caps with lip seals.  Remove ball bearing.  Refer to Figure 5. 9. Remove packing and packing retainer washer. 10. Clean   all   parts   thoroughly   and   examine   for   wear   and damage.    Check  lip  seals,  ball  bearing,  bushings  and  idler pin and replace if necessary.  Check all other parts for nicks, burrs,  excessive wear and replace if necessary. Wash  bearings  in  clean  solvent.    Blow  out  bearings  with compressed  air.    Do  not  allow  bearings  to  spin;  turn  them slowly  by  hand.    Spinning  bearings  will  damage  race  and balls.    Make  sure  bearings  are  clean,  then  lubricate  with nondetergent  SAE  30  weight  oil  and  check  for  roughness. Roughness   can   be   determined   by   turning   outer   race   by hand. If   bearings   have   roughness,   bearings   will   need   to   be replaced. 11. Casing can be checked for wear or damage while  mounted on bracket. ASSEMBLY 1. Install bracket bushing.  If bracket bushing has a lubrication groove, install bushing with groove at 6:00 o’clock position in bracket.    If  carbon  graphite,  refer  to  Installation  of  Carbon Graphite Bushings, page 11. 2. Coat  shaft  of  rotor  shaft  assembly  with  non-detergent  SAE 30 weight oil.   Start  end  of  shaft  in  bracket  bushing  turning from right to left, slowly pushing rotor in casing. 3. Place packing retainer washer in bottom of packing chamber and pack pump with new packing.  Use packing suitable for liquid  being  pumped.    Install  packing,  staggering  the  joints from one side of shaft to other.  Lubricate packing rings with oil, grease or graphite to aid assembly  A  length  of  pipe  will help to seat each packing ring. 4. Install  packing  gland,  capscrews  and  nuts.    Back  rotor  and shaft  out  of  casing  just  far  enough  to  insert  packing  gland through  side  opening  of  bracket  over  end  of  shaft.    Make sure gland is installed square and nuts are tightened evenly. Tighten nuts wrench tight then back off until gland is slightly loose. 5. Coat  idler  pin  with  non-detergent  SAE  30  weight  oil  and place  idler  and  bushing  on  idler  pin  in  head.    If  replacing carbon   graphite   bushing,   refer   to   Installation   of   Carbon Graphite Bushings, page 11. 6. Using a .010 to .015 inch head gasket, install head and idler assembly  on  pump.    Pump  head  and  casing  were  marked before disassembly to insure proper reassembly.  If not, be sure idler pin, which is offset in pump head, is positioned toward   and   equal   distance   between   port   connections   to allow for proper flow of liquid through pump. If pump is  equipped  with  jacketed  head  plate,  install  at  this time along with new gasket. Tighten head capscrews evenly. If pump was equipped with a relief valve and it was removed during disassembly, install on head with new gaskets.  Relief valve adjusting screw cap must always point toward suction port.  Refer to Figures 1, 2 and 3 on page 1.  For relief valve repair    or    adjustments,    refer    to    Pressure    Relief    Valve Instructions, page 11. 7. Slide inner spacer collar over shaft with recessed end facing rotor.      H   and   HL   size   bearing   spacer   collars   are   not recessed. Place   pair   of   half   round   rings   on   shaft   and   slide   inner bearing  spacer  collar  over  half  round  rings  to  lock  them  in place.  There is no pair of half round rings on H and HL size pumps.  Refer to Figure 5, page 4. 8. Press lip  seal,  lip  facing  end  of  shaft,  in  inner  end  cap  and insert end cap through  shaft  end  of  bracket.    Turn  end  cap clockwise,  looking  at  shaft  end,  until  it  engages  threads. End  cap  spanner  wrench  holes  must  be  facing  rotor.    Turn end  cap  with  spanner  wrench  until  it  projects  slightly  from opening on side of bracket.  End cap must not be turned so far that lip seal drops off end of spacer collar on shaft or end cap becomes  disengaged  from  threads.    Refer  to  Figure  5, page 4. If this happens, remove inner spacer collar, half round rings and end cap and start over at Step 7. 9. Pack   ball   bearing   with   multi-purpose   grease,   NLGI   #2. Place on shaft and push or gently drive in place in bracket. 10. Press lip seal, lip facing end  of  shaft,  in  outer  end  cap  and insert end cap in bracket.  Turn end cap in bracket until it is tight against bearing.  Refer to Figure 5, page 4. 11. Put   lockwasher   and   locknut   on   shaft.      Insert   length   of hardwood or brass through port opening between rotor teeth to  keep  shah  from  turning.    Tighten  locknut  to  100  ft.-lbs. torque.    This  is  equal  to  a  100  lb.    load  applied  at  a  1’ distance  from  locknut.    Bend  one  tang  of  lockwasher  into slot  of  locknut.    If  tang  does  not  line  up  with  slot,  tighten locknut  until  it  does.    Failure  to  tighten  locknut  or  engage lockwasher  tang  could  result  in  early  bearing  failure  and cause damage to pump. Remove length of hardwood or brass from port opening. 12. Adjust   pump   end   clearance.      Refer   to   Thrust   Bearing Adjustment, page 11. 13. Lubricate all grease fittings with multi-purpose grease, NLGI #2. page 3-1215