TM 55-1930-209-14&P-2 Table C-1.  Preventive Maintenance Checks and Services for Seawater System (Continued) B - Before D - During A - After D - Daily W - Weekly M - Monthly Q - Quarterly S - Semiannually A - Annually ITEM PROCEDURES EQUIPMENT ITEM INTERVAL TO BE CHECK FOR AND HAVE IS NOT READY/ NO. INSPECTED REPAIRED OR ADJUSTED AVAILABLE IF B   D   A   D  W  M   Q   S   A AS NECESSARY    If chlorination unit valve CU11 is In OPEN position, turn to CLOSE position    Close seawater valves SW47 and SW48    Use in-line bib to drain excess water from line, then close hose bib    Unscrew filter body and drain Clean or replace filter element.    Replace filter body In housing.    Return CU11 and SW47 and SW48 to OPEN. b. When supplying seawater for generator cooling, 1) Check for normal operation and leaks Class III leaks. 2) Regularly monitor generator cooling strainer input and output pressure gauges(void 4 port on barges 2 and 3 only).    Pressure difference of 2-4 psi between the two groups is normal.    If pressure differences between input and output gauges reaches 8 psi, turn handle on generator cool- ing system to route seawater through clean strainer.    Remove and clean dirty strainer basket c. Remove rust and corrosion.  Touch up or paint in accordance with TB 43-0144 as necessary.  Do not paint thread or labels. d. Lubricate air conditioning cooling pump motor and fittings, if necessary, with grease in each oil hole as specified in the manufacturer's manual. C-8