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 (c) Remove belt guard from compres- sor by unscrewing three bolts (two have spinlock nuts).  Place bolts, washers and nuts with guard and place where it will not be damaged. (d) With two V-belts exposed, check appearance for frayed, worn, or extra hard and shiny edges or breaks in underneath side of belts. If belts show these signs, belts must be replaced in pairs in accor- dance with procedures in para- graph 1, above.  If belts are in acceptable condition, proceed with belt alignment/tension check. (e)  With torque wrench, check tight- ness of bolt holding compressor shaft.  Torque to 500 in-lb. (f)  With normal wrench, check tight- ness of setscrew holding pulley on electric motor shaft.  Setscrew must be wrench tight. (g) Lay a straight edge across top of belts from compressor pulley to electric motor pulley and press down on belts with a thumb.  Belts should depress between ¼  and ½  in.  If belts depress more than this, loosen four bolts holding motor to base plate and move motor away from compressor until belts are within tolerances. Tighten motor bolts, check belt tension, and then check belt align- ment.  If all are acceptable, tighten motor bolts wrench tight. (h) Install belt guard using three bolts, spinnuts, and washers. 7-23