TM 10-4320-345-13 Table 2-1.  Operator Preventive Maintenance Checks and Services for Model TWDS20 - cont. Location Item Internal Item to Procedure Not Fully Mission No. Check/Service Capable If: 45 During 20K Collapsible Perform "DURING" PMCS contained Fabric Tanks in the applicable TM DISTRIBUTION POINT 46 During Suction loses a.   Inspect hoses for leaks and loose Class III leak or unlocked couplings b.   Inspect for crimped, collapsed or flattened hose 47 During 125 GPM Pump Perform "DURING" PMCS contained in the applicable TM 48 During Discharge Hoses Inspect hoses for leaks and loose or Class III leak. unlocked couplings b.   Check hoses for kinks.  Unkink hoses 49 During Hypochlorina- Perform "DURING" PMCS contained tion Unit in the applicable TM 50 During Gate Valves Inspect for leaks at valve stem and Class Ill leak (2-inch) coupling 51 During Distribution Inspect for leaks at control handle and Class III leak Nozzles couplings (1-1/2 inch) 52 During Elbow Valves Inspect for leaks at valve stem and Class Ill leak coupling 53 After SUCTION HOSES a.   Inspect couplings for damage and Couplings (6-inch X 10-feet) missing gaskets damaged, gasket damaged or b.   Inspect for torn, punctured or missing, hose damaged hoses punctured or torn c.   Inspect for crimped, collapsed or flattened hose. PUMPING STATIONS 54 After Pipe Fitting Inspect fitting for cracks and external Fitting cracked or (wye) damage. damaged 2-19