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Page Title: ADJUSTMENT OF POPPET ADJUSTING SCREWS (WITH STEERING GEAR INSTALLED ON VEHICLE)
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REASSEMBLY (cont) - TM-5-4210-230-14P-1_985
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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FILLING AND AIR BLEEDING THE SYSTEM
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 STEERING GEAR 48.    Assemble   bleed   screw   (20A)   into   housing   (31),   if applicable and torque to 3.0-3.7 Nm (27-33 in.lbs.). ADJUSTMENT  OF  POPPET  ADJUSTING  SCREWS  (WITH STEERING GEAR INSTALLED ON VEHICLE) 1.   Install  a  suitable  pressure  gage  in  the  line  between the pump and steering valve pressure port. 2.   Actuate steering to provide full travel to wheel stops and  note  pressure  on  gage.  Adjust  adjusting  screw (40) in a clockwise direction to provide a pressure at least   2757   kPa   (400   psi)   below   pressure   noted above.    During  this  adjustment  the  oil  temperature should be approximately 54.4 deg. C (130 deg.  F). Care   must   be   exercised   to   not   hold   pressure   for longer   than   15   seconds   while   this   adjustment   is being  made,  or  damage  to  pump,  from  head,  may result. 3.   Repeat    above    procedure    for    other    direction    of steering.    During  the  above  procedure,  observe  for any tendency of the gear to self steer or motorize.  If self steering does occur, check steering column, slip joint(s) and universal joint(s) for binding or excessive friction.    If  no  problem  is  found  in  these  areas,  the gear should be checked as follows: A.     Is  upper  thrust  bearing  package  (items  11  (2 pcs) and 12) properly installed? If the gear has been assembled with these components out of position  they  probably  will  be  damaged  and should be replaced. B.     Is   valve   sleeve   (15)   "sticky"   on   worm   shaft (17)?  These  two  parts  are  fitted  very  closely and a nick or burr on either part can cause the valve  assembly  to  be  sticky.    Minor  damage can   be   corrected   by   polishing   with   crocus cloth.    If  major  damage  is  evident,  the  valve sleeve  (15),  drive  ring  (16)  and  worm  shaft (17) should be replaced. C.     If (A) and (B) above do not stop the tendency to  self  steer,  the  worm  shaft  (17)  and  valve assembly should be replaced. ADJUSTMENTS   &   REPAIRS   WITH   STEERING   GEAR   ON VEHICLE Removal  of  the  steering  gear  from  most  vehicles  is difficult   and   time   consuming.      It   is   suggested   that   after becoming proficient in servicing the     gear     on     a     bench     as     described     in     this     manual, consideration  be  given  to  performing  adjustment  and  minor repairs without removing the gear from the chassis.  On some vehicles access to the gear may be so restricted that it must be removed for service. 1.    Adjustments: Remove input coupling and pitman arm or  drag  link.    Leave  plumbing  connected  in  normal manner. Engine should be running while adjustments are being made. A.     Adjust sector shaft. B.     Worm  Preload  Adjustment.    Loosen  jam  nut (38),  tighten  adjusting  screw  (39)  to  2.8-3.4 Nm  (25-30  in.lbs.)  and  retighten  the  jam  nut to 95-109 Nm (70-80 ft.lbs.) while holding the adjusting screw so that it does not rotate when the   jam   nut   is   tightened.      Purpose   of   this adjustment   is   to   put   a   light   preload   on   the worm  thrust  bearing  package  items  (11  and 12).      After   the   adjustment   has   been   made, there   should   be   no   perceptible   in   and   out movement    of    the    input    shaft    when    it    is oscilated from right turn to left turn and back. The   input   shaft   should   rotate   smoothly   and without binding thru full travel of the gear with a maximum torque of 3.7 Nm (33 in.lbs.). 2.    Repairs A.     On many installations the trunnion cover (26) can    be    removed    from    the    gear    allowing service  of  the  output  shaft  seal  package  (23 and   24)   and   the   trunnion   cover   seal   (25). Remove   the   pitman   arm   and   clean   gear   in area of trunnion cover so dirt will not get into gear while trunnion cover is removed. Remove   dirt   seal   (27),   clean   dirt   and   paint from shaft.  Remove trunnion cover and shaft seal   package.      Clean   portion   of   shaft   now exposed using fine emery paper if necessary. Cover   shaft   serrations   with   cellophane   tape and reassemble using new shaft seal package (23 and 24), seal (25) and dirt seal (27).  Add fluid to reservoir and bleed system if necessary. B.     If  the  input  shaft  area  is  accessible,  the  input shaft seal assembly, items (7) and (8) can be replaced   with   a   minimum   of   effort   by   the following     procedure.          Remove     the     input coupling    and    clean    the    area    of    the    gear around  the  input  shaft.  Remove  supply  and return    hoses    from    gear    and    plug    hoses. Remove fittings CTS-2717   Page 15 PRINTED IN UNITED STATES OF AMERICA

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