TM 55-1930-209-14&P-19 Table 7-2.  Preventive Maintenance Checks and Services for Compressed Air 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 i.  Barges 2 and 3 compressor air intake fil- ters.  Clean and replace as described in paragraph 3-7.3.b if the time between deaning has been extended to every other month. j.  Compressor oil change (Barge 1).  When oil change is required as part of semian- nual maintenance services, perform these procedures: 1) Shut down air compressor system. 2) Redtag power panel 1 circuit breaker 3P5 indicating, 'WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE." 3) Unscrew oil drain plug and gasket and drain oil into container. 4)  While oil is draining, remove oil cover nut, seal, and oil cover. 5) Upon completion of draining, install oil drain plug with new gasket. 6) Add oil down oil tube until level can be seen in lower half of sight glass. 7) Install oil cover, seal, and oil cover nut. Tighten nut hand tight. 8) Start air compressor system. 9) When compressor is operating, check drain plug and oil cover for leaks (see paragraph 2-1.4).  Tighten as necessary. 10) Remove red tag from power panel 1 circuit breaker 3P5. k  Check overall operation of system by going thru prestart, start, and operating procedures.  Shut down system and repair or replace components as necessary.  Notify shift leader or barge- master of operating discrepancies. Change 1 7-25