TM 10-6640-238-13 4-3 Section III.  UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)/LUBRICATION INSTRUCTIONS Alphabetical Index Paragraph Title Paragraph General.............................................................................................................................................................. 4-6 Leakage Definitions For Unit PMCS ................................................................................................................ 4-8 Unit Preventive Maintenance Checks and Services .......................................................................................... 4-7 4-6. GENERAL. Preventive Maintenance Checks and Services (PMCS) means systematic caring, inspecting, and servicing of Mod Lab A equipment to keep it in good working condition and to prevent breakdown.  The operator’s mission is to: a. Perform PMCS each time Mod Lab A is put into operation.  Always perform PMCS in the same order, so it becomes a habit. b. Perform Quarterly (Q) once each 3 months. c. Perform Semi-Annually (S) once each 6 months. d. Perform Annually (A) once each year. e. Perform Bi-Annually (B) once each 2 years. f. If equipment does not perform as required, refer to Section IV, Troubleshooting for possible problems.  Use DA Form 2404 (Equipment Inspection and Maintenance Worksheet) to record any malfunctions or failures that are discovered before, during, and after operation; or refer to DA Pam 738-750.  If a malfunction or failure can not be corrected, report it to direct support maintenance.  Should malfunctions or failures be repaired, they are not required to be recorded. g. General maintenance practices are as follows: (1) Keep It Clean:  Dirt, grease, oil and debris get in the way and may cover up serious problems.  Keep work area clean.  Use soap and warm water when cleaning rubber or plastic material. (2) Bolts, Nuts and Screws:  Check that they are not loose, missing, bent, broken, or corroded.  Tighten any that are found loose. (3) Welds:  Look for loose or chipped paint, rust or gaps where parts are welded together.  Report a bad weld to direct support maintenance or supervisor. (4) Electric Wires and Connectors:  Look for cracked or broken insulation, bare wires and loose or broken connectors.  Tighten loose connections and make sure the wires are in good condition. (5) Hoses and Fluid Lines:  Look for wear, damage, and leaks.  Make sure clamps and fittings are tight.  Wet spots or stains around a fitting or connector indicates a leak.  If a leak comes from a loose fitting or connector, tighten it.  If something is broken or worn out, either correct or report it to direct support maintenance, or as directed by the MAC. h. Perform Unit PMCS procedures for equipment covered by individual TMs, see Appendix A for TM numbers.