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ADJUSTMENT  OF  POPPET  ADJUSTING  SCREWS  (WITH STEERING GEAR INSTALLED ON VEHICLE)
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NORMAL NOISE
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 STEERING GEAR from gear and plug lower most port to minimize loss of   fluid.      Install   special   fitting   (or   combination   of fittings) in other port to allow connection to shop air. Remove  dirt  seal  (4)  and  retaining  ring  (5).    Clean dirt  and  paint  from  input  shaft  using  fine  emergy paper if necessary.  Place a shop rag over input shaft area  of  gear  and  connect  shop  air  to  special  fitting. Air  pressure  should  cause  seal  assembly  items  (7) and (8), back-up washer (6) and some fluid to come out  of  gear.    Be  sure  shop  rag  is  in  place  and  be prepared   to   disconnect   air   as   soon   as   the   seal assembly is out of the cavity. Apply clean grease to O.D.  and I.D.  of seal and to input  shaft.    Install  seal  assembly  (items  7  and  8) and  back-up  washer  with  flat  side  of  seal  assembly out.  Press against back-up washer with soft (brass) probe  until  back-up  washer  is  just  inside  retaining ring groove. Install retaining ring taking care that it is properly   seated   in   groove.      Pack   cavity   above retaining  ring  with  grease  and  install  dirt  seal.    Add fluid to reservoir and bleed system if necessary. C.   Other parts of the gear which may be serviceable on the  vehicle  are  the  end  cover  (37)  and  the  valve housing  (9)  areas.    Familiarity  with  the  gear  should be   gained   by   bench   disassembly   and   reassembly before   attempting   to   service   these   areas.      The portion of the gear to be disassembled should always be cleaned so that dirt is not introduced into the gear. Also,  whenever  the  end  cover  or  valve  housing  is removed  for  service,  care  must  be  taken  to  position the  worm  thrust  bearing  package  (items  11,  12  and 11)   properly   upon   reassembly.      Anytime   the   end cover  is  removed,  the  worm  adjusting  screw  should be   backed   out   to   avoid   jamming   of   components when end cover is reassembled. Always    check    fluid    level    in    the    reservoir    after servicing the gear.  If a significant amount of fluid is added, the system should be bled. FILLING AND AIR BLEEDING THE SYSTEM 1.    Fill  reservoir  nearly  full.    Be  ready  to  add  oil  when engine is started.  Do not let oil drop below outlet to power pump, to insure that power pump will not suck air into system. 2.    Start  engine,  and  let  idle.    Immediately  add  oil  to reservoir as needed to keep reservoir full. 3.    Steer   vehicle   from   full   right   turn   to   full   left   turn several  times.    Poppets  (34)  must  be  adjusted  so they relieve pressure at full right and full left turns in order  to  remove  air  from  system.    This  procedure should  remove  all  air  from  system  unless  steering gear is invert mounted. 4.    To remove air from inverted mounted steering gears, see steps 1, 2 and 3, then determine which direction of  steering  wheel  rotation  is  required  to  pressurize bleed screw (20A).  Turn steering wheel slowly in this direction and loosen bleed screw a few turns.  When all  air  is  removed  from  system,  tighten  bleed  screw 3.4 + .33 Nm (30 + 3 in.lbs.). If bleed screw (20A) is not tight when steering gear is rotated  in  opposite  direction,  air  will  be  sucked  into system. LUBRICANT For  type  of  lubricant  refer  to  LUBRICATION  CTS- 2412. CTS-2717   Page 16 PRINTED IN UNITED STATES OF AMERICA

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