TM 55-1930-209-14&P-19 Table 3-3.  Preventive Maintenance Checks and Services for ROWPU 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 4)  Clean oil breather element with dry- cleaning solvent, type 2 (A-A-711). Dry thoroughly. 5) Install oil breather element on body. 6) Install oil breather top, flatwasher, lockwasher, and wingnut. 8E RO Block a.  Grease RO block throttling valve R07 as Throttling Valve follows: R07 1)  Clean grease from RO block throttling valve R07 using a clean, lint-free cloth. 2)  Use hand pump grease gun to pump grease (MIL-G-10924) into bearings until grease appears. 3)  Wipe off excess grease. 8F Alternator a. Check alternator belt for looseness, Alternator belt is frays or cracks.  Replace as necessary. loose, frayed If loose, adjust as follows: or cracked. 1)  Remove three nuts, bolts, lockwash- ers, and flatwashers.  Remove alterna- tor guard. 2)  Place straight edges from vibration damper pulley to alternator pulley to adjust. b.  Check alternator for loose mounting hardware and wire connections.  Tighten or replace as necessary. c. Check for damaged alternator.  Alternator If necessary, replace as follows:  inoperable. WARNING To prevent electric shock, ensure battery is disconnected before performing this procedure. 3-28  Change 1