TM 10-3930-675-10
0012 00-2
PREVENTIVE MAINTENANCE CHECKS
AND SERVICES (PMCS) INTRODUCTION - CONTINUED
0012 00
GENERAL PMCS PROCEDURES - CONTINUED
WARNING
Dry cleaning solvent P-D-680 Type III is toxic and flammable. Wear protective goggles and gloves and use
only in a well-ventilated area. Avoid contact with skin, eyes, and clothes and do not breathe vapors. Do not
use near open flame or excessive heat. The solvent’s flash point is 200°F (94°C). If you become dizzy while
using dry cleaning solvent, get fresh air immediately and get medical help. If solvent contacts eyes, wash
your eyes and get medical aid immediately.
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 dry cleaning solvent (Item 13, WP 0019 00) on all metal surfaces. Use detergent (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 lubricating oil (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.
Electric Wires and Connectors. Look for cracked or broken insulation, bare wires, and loose or broken connectors.
Tighten loose connectors and ensure that the wires are in good condition.
f.
Hoses and Fluid Lines. Look for wear, damage, and signs of leaks. Ensure that 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 truck. The following are
definitions of the types/classes of leakage you need to know to be able to determine the status of your truck. 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. WHEN IN DOUBT, NOTIFY YOUR SUPERVI-
SOR. When operating with Class I or Class II leaks, check fluid levels more frequently. Class III leaks must
be reported immediately to your supervisor. Failure to do this will result in damage to vehicle and/or compo-
nents.
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.
