TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 GENERAL INFORMATION BALL AND ROLLER BEARING MAINTENANCE Important-In  order  to  assure  bearings  being  free  of  rust,  dirt, or  damage,  the  following  procedure  relative  to  handling,  and installation is recommended: 1. Cleansing and Lubrication of Bearings (a) Use  clean  kerosene  or  Stoddard  Solvent  in  a clean container. (b) Use  clean,  lint  free  rags  or  towels,  and  never use    waste.        Lint    from    waste    may    enter bearing. (Note: Suitable wheel bearing cleaner equipment   is   available,   which   will   facilitate bearing cleansing.  ) (c) Dip bearing in kerosene several times, rocking bearing  race  rings  slowly  to  dislodge  grease from ball sockets. (d) Spin   bearing   while   repeatedly   dipping   into kerosene.      Continue   operation   until   bearing runs  smoothly  and  quietly  or  until  it  is  clean and ready for inspection. (e) If bearing is found satisfactory, dip in a neutral oil  or  thin  grease  and  wrap.  (Note:  Suitable wheel   bearing   grease   packer   equipment   is available, which will produce excellent results. ) 2. Removal and Installation of Bearings (a) Shafts   or   housings   must   be   clean   and   free from burrs. (b) Use  properly  arranged  press  plates  or  arbors for installation or removal of bearings. In pressing bearings into place the pressure or load  should  be  so  applied  that  it  will  not  be transferred through the balls. For    example,    if    bearing    is    applied    to    or removed    from    shaft,    pressure    should    be applied to inner bearing cone. If bearing is being installed in or removed from a  housing  or  case  bore,  pressure  should  be applied to outer bearing cup. (c) Do not hammer on bearings.  Lead or babbitt hammers   may   chip   off   and   allow   pieces   to lodge   in   bearing.      Wooden   hammers   may leave  splinters  in  bearings.    Steel  hammers will chip, crack, or Brinell the bearing. (d) If necessary to heat bearing for installation or removal,   use   a   light   or   medium-weight   oil heated  to  225°F.    Allow  bearing  to  stand  in this oil until thoroughly heated. (e) Upon installation of bearing, lubricate bearing seat with light oil. (f) Apply  steady  pressure.    If  bearing  sticks  or binds, ascertain cause.  Correct fault and then proceed with operation.  A bearing started in a cocked position will bind. Burrs   in   housings   or   on   shafts   will   cause severe binding and sticking. Bearing should rest squarely against shoulder or in recess. (g) Bearing    should    roll    freely    after    installation unless    individual    specifications    call    for    a preload.      Test   bearing   for   bind   or   drag   by holding bearing outer race between thumb and finger,    and    test    for    side    play.        (A    radial clearance of .  0001" will produce side play of approximately .005" to .006") Shafts mounted in bearings should rotate freely after installation unless individual specifications call for    a    preload.        Test    by    revolving    shaft assembly. 3. Intermixing of Component Parts -Roller Bearings Wherever possible, intermixing of roller bearing component parts should be discouraged.  Therefore, where possible, IH parts should be used to service IH assemblies. CTS-2128-L  Page 5 PRINTED IN UNITED STATES OF AMERICA