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Pinion Nominal Dimension
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Differential Bearing Preload
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 19. Run   micrometer   thimble   down   to   measure   distance between  center  of  ring  gear  and  step  plate.    Make  a  note  of this   reading   along   with   the   nominal   dimension   given   in "SPECIFICATIONS".    Locate  on  pinion  the  etched  marking which  indicates  variation  from  zero  cone  setting.    If  it  is  a minus  figure,  subtract  it  from  specified  dimension,  and  if  a plus    figure,    add    it    to    specified    dimension.        Results    of calculation will provide the corrected pinion nominal dimension   to   which   pinion   must   be   set.   Comparison   of corrected   nominal   dimension   with   the   actual   or   measured dimension  indicates  amount  of  change  necessary  for  correct pinion position.  It may be necessary to add or remove shims between cage and differential carrier to provide correct pinion nominal dimension. 20. Remove  gauge  and  prepare  to  install  ring  gear  and differential carrier in differential housing. 21. If drive gear was removed from case, rivet gear to case flanged half. When  reinstalling  ring  gear,  it  is  suggested  that Riveting  Jig  SE-1575  be  used.    This  special  tool  is designed  for  use  with  either  hydraulic  or  mechanical press    equipment.        Rivet    pressures    for    ring    gear installation should be in accordance with those given in "SPECIFICATIONS". 22. Apply axle lubricant to differential case inner walls and all other component parts. 23. Place thrust washer (25) and side gear (26) in flanged half  of  case  together  with  spider  (27),  pinion  gears  (28)  and thrust washers (29). 24. Install    opposite    side    gear    and    thrust    washer    in differential case plain half (24). 25. Align the match marks and join the two differential case halves.    Draw  assembly  together  with  four  equally  spaced bolts (23) and nuts (33). 26. Check   assembly   for   free   rotation   of   side   gears   and pinions  and  if  satisfactory,  install  remaining  differential  case bolts. Tighten to torque specified in "TORQUE CHART". 27. Differential bearings (22) are installed by pressing them squarely onto differential case halves. 28. Prelubricate   differential   bearings   with   axle   lube   and place bearing cups (21) over bearings.      Attach   chain   sling   to   differential   assembly   and install in carrier. 29. Place  bearing  adjusters  (14)  in  carrier  and  turn  hand tight against bearing cups (21). 30. Observe match marks on bearing caps and install caps onto legs of differential carrier (20). 31. Install  bearing  cap  bolts(17)  and  washers.  Tighten  to specified torque.  (See "TORQUE CHART".) 32. Tighten  bearing  adjusters (14)  alternately  until  all  end play is eliminated.  Rotate differential while tightening. Gear Lash 33. A  special  effort  should  be  made  to  set  the  backlash between  pinion  and  ring  gear  to  the  same  amount  as  was originally    built    into    them    .15-.30    mm    (.006"    to    .012"). Generally the amount of backlash is stamped or etched on the ring gear.  When installing new gears, backlash is measured with a dial indicator mounted on differential housing (Fig.  16). To  adjust  the  backlash  move  the  ring  gear  toward  or  away from  the  pinion.    This  is  done  by  backing  off  one  adjusting ring and advancing the opposite ring the same amount. Fig.  16  Setting Correct Backlash 34. When     original     gear     and     pinion     sets     are     being reinstalled,   the   wear   pattern   of   the   gear   teeth   must   be considered in the backlash adjustment.  Gears that have been in service for long periods form running contacts which should not be greatly changed.  If, in CTS-2658S  Page 9 PRINTED IN UNITED STATES OF AMERICA

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