WARNING TM 10-3930-643-10 2-18. PREVENTIVE    MAINTENANCE    CHECKS    AND    SERVICES.-Continued 8. While     performing     PMCS, observe    WARNINGS    and    CAUTIONS    preceding    those    oper- ations    which    could    endanger    your    safety    or    result    in    damage    to    the    equipment. Dry    cleaning    solvent, P-D-680,     is     toxic     and     flammable. Wear     protective     goggles     and     gloves     and     use     only     in          well- ventilated     area. Avoid    allowing    solvent    to    contact skin, eyes,    and    clothes, and    don’t    breathe    vapors.    Do not    use    near    open    flame    or    excessive    heat. If    you become    dizzy    while    using    cleaning    solvent,    get    fresh    air immediately     and     get     medical     aid. If    solvent    comes    in contact    with    skin    or    clothing, wash     with     water. If solvent     gets     in     your     eyes,     flush     eyes     with     water     and     get medical    aid    immediately. Flash    point    of    solvent    is 100°-1380F (38°-590c). a. Keep    it    clean. Dirt,    grease,    oil    and    debris    only    get    in    the    way    and    may cover    up    a    serious    problem. Clean     as     you     work     and     as     needed.     Use     dry     cleaning solvent    (P-D-680)    to    clean    metal    surfaces. Use     soap     and     water     when     you     clean rubber    or    plastic    material. b. Bolts,    nuts,    and    screws. Check    that    they    are    not    loose,    missing,    bent or     broken. Y OU  can't    try    them    all    with    a    tool,    of    course,    but    look    for    chipped paint,    bare    metal    or    rust    around    bolt    heads. Tighten    any    bolt,    nut,    or    screw that    you    find    loose. c.     Welds. Look     for     loose     or     chipped     paint, rust,     or     gaps     where     parts     are welded    together. If    you    find    a    bad    weld, report     it     to     organizational maintenance. d. Electric     wires     and     connectors. Look    for    cracked    or    broken    insulation, bare    wires    and    loose    or    broken    connectors. Report    damaged    or    loose    wiring    to organizational maintenance. e. Hoses    and    fluid    lines. Look    for    wear,    damage    and    leaks. Make    sure clamps    and    fittings    are    tight. Wet     spots     show     leaks,     of     course,     but     a     stain around    a    fitting    or    connector    can    mean    a    leak. If     leakage     comes     from     a     loose fitting    or    connector,    tighten    the    fitting    or    connector.    If    something    is    broken or    worn    out, report    it    to    organizational    maintenance. f. Vehicle     must     be     on     level     ground     in     order     to     get     correct     fluid     level measurement. 9. It     is     necessary     for     you     to     know     how     fluid     leaks     affect     the     status     of     your equipment. The    following    are    definitions    of    the    types/classes    of    leakage    you need    to    know    to    be    able    to    determine    the    status    of    your    equipment. Learn    and be    familiar    with    them    and    REMEMBER    -   when    in    doubt,    notify    your    supervisor. 2-15