TM 10-4320-345-13 Table 2-1.  Operator Preventive Maintenance Checks and Services for Model TWDS20 - cont. ITEM INTERVAL LOCATION PROCEDURE NOT FULLY MISSION NO. ITEM TO CHECK/ CAPABLE IF: SERVICE 25 Before Elbow Valves a.  Inspect for loose, broken, or Valve cracked, broken or missing hand wheel Rotate hand stuck. wheel.  Valve should turn freely. b.  Inspect valve body for cracks and external damage. c.  Inspect for cracked and bent or broken couplings. 26 Before Nozzle Stands Inspect for broken chains, missing hardware, and bent or cracked legs. 27 During SUCTION HOSES a.  Inspect hoses and coupling clamps Class III leak. (6-inch x 10-feet) for leaks. b.  Inspect for crimped, collapsed or flattened hose. PUMPING STATIONS 28 During Pipe Fitting Inspect fitting and coupling clamps for Class III leak. (wye) leaks. 29 During Butterfly Valves Inspect for leaks at valve stem and Class III leak. coupling clamps. 30 During Suction Hoses a.  Inspect hoses and coupling clamps. Class III leak. for leaks. b.  Inspect for crimped, collapsed or flattened hose. 31 During 600 Gpm Pump Perform "DURING" PMCS contained in the applicable TM. 32 During Check Valve Inspect valve body for leaks. Class III leak. 33 During Pressure Relief Inspect valve body and coupling Class III leak. Valves clamps for leaks. 34 During Discharge Hoses a.  Inspect hoses and coupling clamps. Class III leak. for leaks. b.  Check hoses for kinks Straighten hoses. 2-17