UNIT PREVENTIVE MAINTENANCE CHECKS AND
SERVICES (PMCS) INTRODUCTION - CONTINUED
GENERAL LUBRICATION PROCEDURES - CONTINUED
Refer to AR 70-12 for use of standardized fuels and lubricants.
Engine, transmission, and hydraulic system oil filters shall be changed when:
they are known to be contaminated or clogged;
at prescribed hardtime intervals.
This equipment is not covered by AOAP. Follow manufacturer's intervals as specified in this manual.
For equipment under manufacturer's warranty, hardtime oil service intervals shall be followed. Intervals shall be short-
ened if lubricants are known to be contaminated or if operation is under adverse conditions (i.e., longer-than-usual oper-
ating hours, extended idling periods or extreme dust).
GENERAL PMCS PROCEDURES
Always perform PMCS in the same order so it gets to be a habit. Once you've had some practice, you'll spot anything
wrong in a hurry. If any deficiency is discovered, perform the appropriate troubleshooting task in Chapter 2 of this man-
ual. If any component or system is not serviceable, or if the given service does not correct the deficiency, notify your
Before performing preventive maintenance, read all the checks required for the applicable interval and prepare all tools
needed to make all checks. Have several clean rags (Item 31, WP 0171 00) handy. Perform ALL inspections at the appli-
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 detergent (Item 11, WP 0171 00) and water when you clean.
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 24, WP 0171 00). Report it to your supervisor.
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.
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.
Electric Wires and Connectors. Look for cracked or broken insulation, bare wires, and loose or broken connec-
tors. Tighten loose connectors and ensure that the wires are in good condition.
Hydraulic Hoses and 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, correct it if authorized by the Maintenance Allo-
cation Chart (WP 0170 00). If not authorized, notify your supervisor.
Fluid Leakage. It is necessary for you to know how fluid leakage affects the status of your machine. The follow-
ing are definitions of the types/classes of leakage you need to know to be able to determine the status of your
machine. Learn and be familiar with them, and remember - when in doubt, notify your supervisor.
Leakage Definitions for PMCS
Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
Leakage of fluid great enough to form drops, but not enough to cause drops to drip from
item being checked/inspected.
Leakage of fluid great enough to form drops that fall from item being checked/inspected.