TM 10-3930-675-10-1
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) INTRODUCTION - CONTINUED
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GENERAL PMCS PROCEDURES - CONTINUED
WARNING
Solvent cleaning compound MIL-PRF-680 Type III is an environmentally compliant and low toxic
material. However, it may be irritating to the eyes and skin. Use protective gloves and goggles. Use in
well-ventilated areas. Keep away from open flames and other sources of ignition. Failure to do so may
cause injury or death to personnel.
a. Keep It Clean. Dirt, grease, oil, and debris get in the way and may cover up a serious problem. Clean as you work
and as needed. Use Solvent, Dry Cleaning, Type III (Item 13, WP 0019 00) on all metal surfaces. Use Detergent,
General Purpose, Liquid (Item 3, WP 0019 00) and water when you clean rubber, plastic, and painted surfaces.
b. Rust and Corrosion. Check metal parts for rust and corrosion. If any bare metal or corrosion exists, clean and apply
a light coat of Oil, Lubricating, OE/HDO 10 (Item 10, WP 0019 00). Report it to your supervisor.
c. Bolts, Nuts, and Screws. Check bolts, nuts, and screws for obvious looseness, missing, bent, or broken condition.
You can't try them all with a tool, but look for chipped paint, bare metal, or rust around bolt heads. If you find one you
think is loose, tighten it.
d. Welds. Look for loose or chipped paint, rust, or gaps where parts are welded together. If you find a bad weld, report it
to your supervisor.
e. Electrical Wires and Connectors. Look for cracked or broken insulation, bare wires, and loose or broken connec-
tors. Tighten loose connectors and ensure wires are in good condition.
f. Hoses and Fluid Lines. Look for wear, damage, and signs of leaks. Ensure clamps and fittings are tight. Wet spots
indicate leaks, but a stain around a fitting or connector can also mean a leak. If a leak comes from a loose fitting or
connector, tighten it. If something is broken or worn out, report it to your supervisor.
g. Fluid Leakage. It is necessary for you to know how fluid leakage affects the status of your RTCH. The following are
definitions of the types/classes of leakage you need to know to be able to determine the status of your RTCH. Learn
and be familiar with them, and remember - when in doubt, notify your supervisor.
CAUTION
Operation is allowable with Class I and Class II leakage with the exception of fuel leaks. WHEN IN
DOUBT, NOTIFY YOUR SUPERVISOR. When operating with Class I or Class II leaks, check fluid
levels more frequently. Class III leaks must be reported immediately to your supervisor and/or Orga-
nizational Maintenance. Failure to do this will result in damage to vehicle and/or components.
Leakage Definitions for PMCS
Class I
Leakage indicated by wetness or discoloration, but not great enough to form
drops.
Class II
Leakage great enough to form drops, but not enough to cause drops to drip from
the item being checked/inspected.
Class III
Leakage great enough to form drops that fall from the item being checked/
inspected.
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