TM 10-6640-238-13 4-8 Table 4-1.  Unit Preventive Maintenance Checks and Services (PMCS) – CONT Q - Quarterly     S - Semi-Annually     A - Annually     B-Bi-Annually Item No. Interval Item to Inspect Procedures Not Fully Mission Capable If: Q S A B 10 Vacuum System a.   Check vacuum pump for good condition and proper operation. Refer to TM 10-4310-391- 13&P for further PMCS instructions. Vacuum pump inoperative, has missing or loose mounting hardware or fasteners, or loose or broken electrical connections b.   Check system tubing and piping for good condition. System tubing and piping has leaks. c.   Check system valves for good condition. System valves have leaks. 11 Water System a.   Check water pump for good condition.  Refer to TM 10- 4320-321-13&P for further PMCS instructions. Water pump has missing or loose mounting hardware or fasteners, or loose or broken electrical connections. b.   Check water tank for good condition. Water leaks from tank or fittings, or has missing or loose tank mounting hardware or fasteners c.   Check surge tank for good condition. Water leaks from tank or fittings, or has missing or loose tank mounting hardware or fasteners d.   Check water pressure switch and gauge for good condition. Water pressure switch has loose electrical connections or gauge is broken or inoperative. e.   Check water filter for good condition. Water filter has leaks, or missing mounting screws f.    Check water chiller for good condition.  Refer to commercial manual for further instructions. Water chiller inoperative or has leaks.  Water chiller has missing or loose mounting hardware or fasteners, or loose or broken electrical connections. g.   Check water heater for good condition and proper operation. Water heater inoperative, water leaks from heater, fittings, has missing or loose mounting hardware or fasteners, or loose or broken electrical connections.