TM 55-1930-209-14&P-19 Table 2-4.  Preventive Maintenance Checks and Services for Seawater System (Continued) B - Before D - Daily Q -  Quarterly D - During W - Weekly S -  Semiannually A - After M - Monthly A -  Annually INTERVAL ITEM PROCEDURES EQUIPMENT ITEM 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. Change 1      2-15