UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) INTRODUCTION
This work package contains Unit Maintenance PMCS requirements for the HET Tractor A/C system. These PMCS
requirements are in addition to those listed in TM 9-2320-360-20. The PMCS tables contain checks and services necessary to
ensure that the truck is ready for operation. Using PMCS listed tables, perform maintenance at specified intervals. Perform
PMCS listed in TM 9-2320-360-10, TM 9-2320-360-20, and chapter 3 before performing these PMCS checks.
GENERAL MAINTENANCE PROCEDURES
WAR N I N G
Solvent cleaning compound MIL-PRF-680 Type II and III may be irritating to the eyes and skin. Use protec-
tive gloves and goggles. Use in well-ventilated areas. Use respirator as needed. Accidental ingestion can
cause irritation of digestive tract and respiratory tract, may cause lung and central nervous system damage.
Can be fatal if swallowed. Inhalation of high/massive concentrations can cause coma or be fatal. First aid for
ingestion: do not induce vomiting. Seek immediate medical attention. First aid for skin contact: remove con-
taminated clothing. Wash skin thoroughly with soap and water. If symptoms persist, seek medical attention.
First at for eye contact: flush with water for 15 minutes or until irritation subsides. If symptoms persist, seek
medical attention. First aid for inhalation: move to fresh air. If not breathing, provide artificial respiration. If
symptoms persist, seek medical attention. Keep away from open flames and other sources of ignition. Fail-
ure to follow this warning may result in injury or death to personnel.
· The flashpoint for type II solvent cleaning compound is 141-198°F (61-92°C) and type III is 200-241°F (93-
· Improper cleaning methods and use of unauthorized cleaning solvents may injure personnel and damage equip-
· Fire extinguishers should be placed nearby when using solvent cleaning compound. Failure to follow this
warning may result in injury or death to personnel.
· Cloths or rags saturated with solvent cleaning compound must be disposed of IAW authorized facilities' proce-
dures. Failure to follow this warning may result in injury to personnel.
· Eye shields must be worn when cleaning with a wire brush. Flying rust and metal particle may cause injury to
· Liquid refrigerant, when exposed to air, quickly evaporates and will freeze skin or eye tissue. Use care to pre-
vent refrigerant from touching your skin or eyes. Serious injury or blindness may result if you come in contact
with liquid refrigerant.
· Refrigerant R-134a A/C systems should not be pressure tested or leak tested with compressed air. Combustible
mixtures of air and R-134a may form, resulting in fire or explosion, which could cause personnel injury or
Cleanliness. Dirt, grease, oil, and debris may cause or cover a serious problem. Use drycleaning solvent (Item 13,
WP 0061 00) on metal surfaces and soapy water on rubber items.
Bolts, nuts, and screws. Check bolts, nuts, and screws for obvious looseness, missing, bent, or broken condition
and tighten or replace as necessary. If they cannot be checked with a tool, look for chipped paint, bare metal, or
rust around bolt heads.
Welds. Look for loose or chipped paint, rust, or gaps on welds. If a bad weld is found, notify the supervisor.
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 shape.
A/C system leaks. Look for A/C lubrication leakage and corrosion, and damage to fittings, hoses, and other com-
ponents. Inspect lowest points of fittings and hoses for indication of lubrication leakage.
Damage. Damage is defined as any condition that affects safety or would make the truck unserviceable for mission