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 NOTE AFTER OPERATION · · For less than 12 hour shutdown: 1.  Turn AUTO-MANUAL switch on electric controller to MANUAL. 2.  Push electric controller STOP button. 3.  Close main supply valve on forward end of receiver by turning handle at right angle to pipe. 4.  Follow procedures a through d below. · For extended shutdown - 12 hours or more follow procedures e through m below. 5 Compressor a. Drain filters 1 and 2 by opening drain valves on bottom of filters. b. Close drain valves when water and mois- ture have drained. NOTE Weekly or after every 40 hours of equipment operation (whichever occurs first). c. Barge 1.  Clean compressor air filter by the following procedures. 1)   Redtag power panel  circuit breaker 3P5 indicating.  WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE." 2)   Shut down air compressor system. 3)   Unscrew by turning clockwise oil cover nut on top of air intake assem- bly on top of compressor. 4)   Remove oil seal and oil cover. Change 1    7-17