TM 10-4320-303-13 Table 2-7.  Operator Preventive Maintenance Checks and Services for TWDS. Location Item No. Interval Item to Check/Service Procedure Not Fully Mission Capable if: LEAD PUMPING STATION 1 Before Suction Hose Assembly Inspect for damage, leaks, and loose connections.  Tighten loose connections. If hose is damaged or Class III leaks are present, notify supervisor. Hose is damaged or collapsed. Class III leak.  Connection is loose. 2 Before 6 Inch Butterfly Valve Ensure butterfly valves on hose assemblies are in open position.  If valve will not open, notify supervisor. Ensure butterfly valve on bypass hose assembly is closed when not in use.  If valve will not close, notify supervisor. Valve on suction and discharge hoses will not fully open.  Valve on bypass hose assembly is open. 3 Before Check Valve Ensure check valve is Check valve is installed properly.  Arrow on not installed body casing must point in properly. direction of water flow.  If Connection is valve is not installed loose.  Class correctly notify supervisor. III leak. Inspect for leakage and loose connections. Tighten loose connections. If Class III leak is present, notify supervisor. 4 Before Discharge Hose Inspect for damage, leaks, Hose is damaged Assembly and loose connections. or collapsed. Tighten loose connections. Class III leak. If hose is damaged or Class Connection is III leak is present, notify loose. supervisor. 2-15