TM 10-3930-671-24 9. Clean   all   parts   in   approved   cleaning   solvent. Inspect    the    bearings    and    bearing    cups    for scratches, cracks, glazing, rust pitting, flat spots and other wear.  Replace damaged parts. NOTE Keep   serviceable   bearing   cups   and cones matched together. Always replace bearing cups and cones as a set. 10. If  bearings  require  replacement,  use  a  standard puller to remove bearing cups from wheel hub. 11. Discard   grease    seal.        Replace    with    new    at assembly. 12. Install new bearing cups by pressing into wheel hub.  Take care to apply an even force to the bearing cup to prevent cracking during installation.  Be sure that each bearing cup is fully seated (bottomed out) against shoulder in hub bore. F-434