TM 10-4610-239-10 TM 08580B-10/1 Table 2-3.  Operator/Crew Preventive Maintenance Checks and Services (Unit) (Continued) B - Before D - During A - After H - Hourly Interval Interval Procedures: Equipment Is Item Item to be Check for and have repaired Not Ready/ No. B   D A W Inspected or adjusted as necessary Available If: 15 • • • Color comparator Inspect the color comparator kit, TDS meter kit and TDS meter.  Look for: • Poor condition • Dirty sample cells • Dirty color discs • Cracked or dirty frosted glass • Clean as necessary. Notify unit maintenance if any part is defective. 16 • • • Regulate product Inspect for loose hose con- Valves will not flow valve and nections.  Inspect valves to operate. backwash valve see if they operate freely and do not leak. Tighten loose connections. Notify unit maintenance if valves bind or leak. 17 • • Vent and drain Inspect for leaks and proper Valves will not valves and drain operation operate. Cocks. Notify unit maintenance if you notice anything wrong. WARNING Do not operate ROWPU with an open junction box; it can kill you. 18 • • Junction Box Inspect the junction box for loose power cable connectors. Securely tighten any loose connections. 19 • • Control box Inspect for outside damage Any toggle switch assembly and Clean out dirt and dust collected except PANEL Junction box in them.  Use test indicator lights LIGHT is broken. assembly switch to ensure indicator lamps are functioning properly. 2-25