TM 55-1930-209-14&P-3 a. Always use new seals and gaskets before reassembling components disassembled for repair.  Be sure to use only the correct seals and gaskets and install them carefully to avoid damage. b. When replacing O-rings, make sure all surfaces are clean and free of dirt, grit, or foreign material.  Prior to installation, apply a thin coat of silicone grease to the O-ring.  Protect O-rings by applying tape over threads, sharp corners, and edges. c. To  ensure  a  leak-proof  joint  when  replacing  gaskets,  make  sure  mating  surfaces  are  clean  and  free  of  old gasket material, adhesive, oil, or grease. d. When   replacing   electrical   components,   follow   proper   procedures   for   soldering   or   crimping   connections. Check  all  grounding.    Make  sure  current-carrying  members  are  properly  insulated  to  avoid  short-circuiting. Check for abrasions and chafing of insulation on wires and cables.  Repair with tape or replace as necessary. Table 4-1.  ROWPU System Troubleshooting Condition Possible Cause Suggested Action 1. Low flow of seawater a. Valve RO18 not a. Open valve RO18 at flow rate indicator F1              fully open b. HP pump engine speed    b. Adjust (paragraph 3-4 not adjusted correctly        steps q-s) with throttle valve R07 c. Seawater system not       c. Troubleshoot sea- providing proper flow water system of seawater (TM 55-1930-209-14&P-2) 2. Seawater appears                     a. Seawater filters           a. Drain filters or very cloudy in clogged or seawater clean seawater seawater pump flow strainers dirty strainers rate indicator Fl (TM 55-1930-209-14&P-2) 3. MEDIA FILTER OK light                a. Bulb burned out            a. Replace bulb (paragraph on control station is out 4-8.1.7) b. Media filters clogged b. Backwash (paragraph 4-7.2) 4. Pressure difference                  a. Media filters a. Backwash filters between pressure                       clogged                       (paragraph 4-7.2) gauges P1 and P2 exceeds 35 psi                      b. Valve RO4                  b. Open valve RO4 improperly positioned 5. CARTRIDGE FILTER                     a. Bulb burned out            a. Replace bulb (paragraph OK light on ROWPU                                                   4-8.1.7) control station is                  b. Cartridge filter           b. Replace cartridge out                                    elements clogged              cage assembly (paragraph 4-7.1.1) 6. Pressure difference                  a. Cartridge filter           a. Replace cartridge between pressure                       elements clogged cage assembly gauges P2 and P3 (paragraph 4-7.1.1) exceeds 12 psig 7. Water sample                         a. Inadequate dose of         a. Increase stroke taken at valve RO8                     coagulant                     on coagulant pump is cloudy b. Coagulant pump off         b. Start pump at control station by turning coagulant pump ON/OFF switch ON c. Coagulant drum empty     c. Replace drum (paragraph 4-7.1.3) and prime pump (paragraph 4-7.1.5) 4-2