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 WARNING When bleeding receiver drain cock, ALWAYS use protection shield to protect eyes and face from flying particles.  Wear gloves and avoid skin damage by rolling down shirt sleeves on clothing and closing buttons and collars. e. Open drain cock on bottom of receiver to drain air and water.  Turn small handle clockwise.  When receiver pressure reads 0 psi, close drain cock. f. Open drain valves on bottom of air filters 1 and 2. g. Open air station valves 1 through 5 and 7 by turning counter-clockwise until they stop.  Leave them open. h. Make sure air station valves 6, 8 and 9 are closed. i. Check that receiver pressure gauge indi- Pressure gauge cates no more than 155 psi when com- indicates more pressor set for AUTO.  If pressure than 155 psi. greater, pull test link on air safety valve. If air does not escape, replace safety valve.  Valve cannot be adjusted or repaired.  To replace valve: 1)   Shut down air compressor system. 2)   Redtag power panel 1 circuit breaker 3P5 to indicate, "WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE." 3)   Unscrew safety valve. 4)   Screw in new safety valve (Barge 1 - P/N 9710-5332-00) (Barges 2 and 3 - P/N 91A0331 75-001) wrench tight. 5)   Start air compressor system. 7-13