TB 9-2320-279-13&P-4
FIELD MAINTENANCE
INTRODUCTION - PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) INTRODUCTION
This section contains PMCS requirements for HEMTT series vehicles. The PMCS tables contain checks and services
necessary to ensure that the vehicle is ready for operation. Using PMCS tables, perform maintenance at specified
intervals. Operator Preventive Checks and Services must be completed before doing Field Level Preventive Checks
and Services.
MAINTENANCE FORMS AND RECORDS
Every mission begins and ends with paperwork. There is not much of it, but it must be kept up. The filled out forms
and records have several uses; they are a permanent record of services, repairs, and modifications made on the
vehicle, they are reports to unit maintenance and to your Commander; and they serve as a checklist to find out what
is wrong with the vehicle after its last use, and whether those faults have been fixed. For more information on forms
and records, refer to DA PAM 750-8. (WP 0079)
GENERAL MAINTENANCE PROCEDURE
Cleanliness: Dirt, grease, oil, and debris only get in the way and may cover up a serious problem. Use
solvent cleaning compound (WP 0083) on all metal surfaces and soapy water on rubber.
Bolts, Nuts, and Screws: Check bolts, nuts, and screws for obvious looseness, missing, bent, or broken
condition and tighten or replace as necessary. They cannot all be checked with a tool, of course, but look
for chipped paint, bare metal, or rust around bolt heads.
Welds: Look for loose or chipped paint, rust, or gaps where parts are welded together. If a bad weld is found,
have it repaired.
Electric Wires and Connectors: Look for cracked or broken insulation, bare wires, and loose or broken
connectors. Tighten loose connectors and make sure wires are in good shape.
Hydraulic Hoses and Fittings: Look for wear, damage, and leaks, and make sure clamps and fittings are
tight. Wet spots show leaks, of course, but a stain around a fitting or connector can indicate a leak. If a
connector or fitting is loose, tighten it. If something is broken or worn out, repair or replace per applicable
procedure.
Damage is defined as: Any conditions that affect safety or would render the vehicle unserviceable for
mission requirements.
FLUID LEAKAGE
NOTE
Equipment operation is allowable with minor leakage (Class I or II). Consideration must be
given to the fluid capacity in the item/system being checked/inspected. When in doubt, notify
the supervisor. When operating with Class I or II leaks, continue to check fluid levels as
required in the PMCS. Class III leaks should be repaired per applicable procedure.
Fluid leakage affects the operational status of fuel, oil, coolant, and the hydraulic systems. The following are
definitions of types/classes of leakage necessary to know in order to determine the status of the vehicle:
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 item being
checked/inspected.
Class III: Leakage of fluid great enough to form drops that fall from the item being checked/inspected.
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