Item No. 15. 16. 17. 18. TM10-4610-232-12 Table  4-1.  Unit  Preventive  Maintenance  Checks  and  Services Interval Semi- Annual Semi- Annual Semi– Annual Semi– Annual Item To Be Checked  Or Serviced Booster Pump and  Cover Media Filter Air Blanket Level ln- dicator Media Filter Diesel Heaters and Thermostats Procedure b. Check cable connector, pins, inserts, wires and screws for burnt, damaged, loose or missing parts. c. Check inside housing for cleanliness  and  insects. NOTE Must perform tasks in para- graphs  4-42  and  4-43  for checks. a. Check electrical connector box and cables for tightness and proper  mounting. b. Check cable pins, inserts and wires to screw connectors for burnt, damaged, loose or missing parts. c. Check for loose screws and mounts on pump motor and be- tween  pump  and  motor. d. Check cover for damaged dampening insulation, loose or missing  mounting  hardware. a. Check for filter media in tub- ings from the media filter to the indicator assembly. Clean tubes if any media is found (Para. 4-52). b. Check for media in the indica- tor assembly. Disassemble indi- cator and clean if any media found. c. Test the three switches for continuity after resetting all flags to white (para. 4-52). Check for loose or damaged components and hardware. Check for leaks. a. Check all components for loose hardware, wires and fuel lines. Check for fuel leaks. Not  Mission Capable  If: Connector,  pin,  insert, screw or wire damaged, missing or burnt (Cold weather  operations  only). Any cable connection, pin or insert damaged. Any connector, pin, in- sert, screw or wire dam- aged, burnt or missing. Any bolt loose causing excessive  vibration. Top switch shows conti- nuity. Middle and bottom switches do not show continuity. Any component damaged or leaking that will allow NBC   contamination. Any fuel leaks. Change   2   4-9