TM9-2320-363-20-1 IGENERAL  INSPECTION INSTRUCTION (CONT) 6. 7. 8. 9. . Scoring. Slight    scoring,    scuffing,    galling,    or   other    surface damage is   identified by   tears or   scratches in   the    direction    of   sliding.    it   starts    in   areas having    the    highest    stress    and speed. This    is   usually    at   the    tip   of   the   teeth. . Burning. Burning    is   indicated by   discoloration    and   loss   of   hardness due   to   excessive temperature. This    is   caused by   too   much   friction   resulting from   overload, overspeed, lack    of   backlash, or   faulty    lubrication. If   discoloring    can    be   wiped    off   with   clean    cloth, such   discoloring usually    can    be   traced    to   oilburn-trains, which    are    not   serious. . Rolling. This    damage occurs    mainly    on   plastic   gears. Rolling    is   when    material is   pushed out   of   shape without    breaking off.   This   is   caused by   heavy, even    loads;    sliding;   or overheating. . Brinelling. This    can    be    identified by   tiny   indentations or   ridges    on   the    shoulder    or   race of   a   bearing. Splines. Inspect    shaft    splines    for   wear, pitting,   rolling,   peening, and    fatigue    cracks. In   many cases, the    same inspection procedure will   apply   to   gears. However, the    problem, if   present, will   often    be    much    less   pronounced. Have a   magnetic    particle inspection performed on   splines, if   needed. Tubes, Hoses, Fittings, and    Connections. Check    all   hose   surfaces for   broken    or   frayed fabric. Check for   breaks caused by   sharp    kinks   or   rubbing   against other parts   of   the   truck. Inspect air   tubes    for   kinks. Inspect    the   fitting   threads    for   damage. Replace any   part   found    defective. Following assembly and    during    initial   operation, check    for   leaking fittings    and   connections by coating fittings    and    connections with   soap    solution.   No   leakage is   permissible. Electrical Parts. Inspect all   wiring    harnesses for   chafed    or   burned insulation. Inspect    all terminal connectors for   loose    connections and   broken    parts. Metal Parts. Visually inspect    all   castings    and   weldments for   cracks. Parts    that    carry    a   great load    should    receive magnetic particle inspection.    Critical    nonferrous parts    may   be    inspected with   fluorescent penetrant. 10. Brake    Drums.    Check    surfaces   of   brake   drums   for   cracks   or   badly   scored   finish   and   for   glossy or   heat   spots.   Check brake   drums   for   external   or   mating   surface    cracks   and   for   balancing   weight. IGENERAL   REPAIR  INSTRUCTION 1. 2. WARNING Drilling    and    grinding operations are    hazardous to   the eyes. Eye    protection is required to   help    prevent injury   to   personnel. Burrs. Remove burrs    from   gear    teeth    with   a   fine-cut    file   or    hand    grinder. Remove burrs   on closely fitted    mating    surfaces by   lapping   the    surfaces    with   abrasive grade    compound. Exterior Parts. or   where parts metal surfaces 2-24 Chassis and    exterior painted    parts   may   be    resurfaced where paint    is   damaged, have been as   required repaired, by   using   an   abrasive disc    driven    by   a   flexible shaft. Paint per   TM-9-2320-363-10.