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Fig.  3  Drive Gear Rivet Removal
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  8  Differential (Exploded View)
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 16. Drive  the  pinion  assembly  from  the  companion  flange with a soft hammer.  Do not allow pinion assembly to fall. 17. Remove pinion cage "O" ring type seal (Fig.  7). 18. Tap    pinion    from    cage    and    remove    forward    thrust bearing. 19. Remove   the   thrust   bearing   spacer   from   the   pinion shaft. 20. If  it  is  necessary  to  remove  the  rear  thrust  bearing  or the    radial    bearing    from    the    pinion    shaft;    remove    these bearings with a suitable puller. Fig.  7  Removing Pinion Cage Oil Seal CLEANING, INSPECTION AND REPAIR Remove all dirt, old lubricant and gasket material from components of the front axle. Immerse in cleaning solvent and use  a  stiff  brush  if  necessary.    Bearings  should  be  cleaned separately in clean solvent and special efforts taken to protect their finely machined surfaces.  If compressed air is used for drying, do not spin bearings while drying. Never   use   anything   but   brake   fluid   to   clean hydraulic brake cylinders. Examine  all  bearings  for  roughness,  damage  to  wear by rotating each bearing slowly   in   the   hand.      If   in   doubt   as   to   bearing   condition, replace.  Ring gear, drive pinion, differential pinions and any other   gears   should   be   checked   for   damaged   teeth,   worn spots,  or  distortion.    Inspect  differential  case  assembly  for cracks, damage or distortion.  Make sure splined ends of axle shafts are neither twisted or cracked.  Shim packs should be of uniform thickness.  Discard thrust washers and obtain new even  when  only  slight  wear  is  indicated.    Always  use  new gaskets.    Hex  nuts  and  capscrews  with  rounded  corners,  all lockwashers, seals, pins and bushings should be replaced. REASSEMBLY Differential The   principal   adjustments   made   on   the   differential carrier assembly are devised for establishing the proper gear tooth   contact   and   thereby   obtaining   a   long   wearing,   quiet running front axle.  Fundamentally, there are five adjustments to be covered and these are accomplished as the differential carrier     assembly     is     assembled.          To     emphasize     their importance these five steps or adjustments are listed here as well as in the actual assembly procedure.  These adjustments are: 1. Preload the pinion bearings. 2. Establish the pinion nominal dimension. 3. Set gear lash. 4. Preload the differential bearings. 5. Check the gear tooth contact. Refer  to  the  exploded  view  (Fig.    8)  and  reassembly differential carrier as follows. 1. Press rear thrust bearings (6) firmly against shoulder of pinion shaft (12). 2. Press  radial  bearing  (13)  on  stub  end  of  pinion  shaft (12)  and  against  pinion.    Stake  face  of  pinion  evenly  in  six places to secure radial bearing in place (Fig.  9). CTS-2658S  Page 5 PRINTED IN UNITED STATES OF AMERICA

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