TM 10-6640-215-13
4-7. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES- continued.
(2) Bolts, nuts and screws: Check that they are not loose, missing, bent or broken. You can't try them all
with a tool, of course, but look for chipped paint, bare metal, or rust around bolt heads. Tighten any
that you find loose.
(3) Welds: Look for loose or chipped paint, rust or gaps where parts are welded together. If you find a
bad weld, report it to you supervisor.
(4) Electric wires and connectors: Look for cracked or broken insulation, bare wires and loose or broken
connectors. Tighten loose connections and make sure the wires are in good condition.
(5) 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 a leak comes
from a loose fitting or connector, tighten it. If something is broken or worn out, either correct it or
report it to direct support maintenance (refer to MAC).
e.
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.
Leakage definitions for unit PMCS
CLASS I
Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
CLASS II
Leakage of fluid great enough to form drops but not enough to cause drops to drip from the item being
checked/inspected.
CLASS III
Leakage of fluid great enough to form drops that fall from the item being checked/inspected
4-8. PMCS PROCEDURES.
Specific procedures for performance of preventive maintenance checks and services are given in Table 4-1.
Individual Equipment Unit PMCS. Unit PMCS procedures for equipments covered by their own individual TMs will be
outlined in those TMs. (Refer to Appendix A for TM numbers).
4-5
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