TM 10-6640-215-13 Table 4-1.  Unit Preventive Maintenance Checks and Services Item Interval Item To Be Procedure Not Fully Mission No. Checked Or Capable Serviced 10 Quarterly Water System NOTE Refer to TM 10-4320-321-13&P for further PMCS instructions. a.    Check  water  pump  for  damage. Check mounting hardware and electrical connections. Pump does not operate properly.  Mounting hard- ware is loose or missing. missing. b.  Check water tank for leaks. Water tank leaks.  Mount- Check mounting hardware and electrical connections ing hardware is loose or c.  Check surge tank for leaks. Tank or fittings leak. Check mounting hardware. Mounting hardware is loose or missing. d.  Check water pressure switch Switch or gage does not op- and gage for proper operation. erate properly.  Mounting Check mounting hardware and electrical connections hardware loose or missing. . Water tank leaks.  Mount- e.  Check water chiller for leaks. ing hardware is loose or Check mounting hardware. missing. NOTE Refer to TM 10-4130-240- 13&P for further PMCS instructions. f.  Check water chiller for proper Water chiller does not oper- operation.  Check mounting hard- ate properly.  Mounting ware and electrical connection. hardware loose or missing. g.  Check water heater for leaks. Water heater leaks.  Mount- Check mounting hardware and electrical connections. ing hardware is loose or missing. h.  Check electric still for proper Electric still does not oper- operation.  Check mounting hard- ate properly.  Mounting ware and electrical connection. hardware is loose or mis- sing. i.  Check drain tank for leaks. Tank, tubing, piping, or fit- Check mounting hardware and electrical connections. tings leak.  Mounting hard- 4-8