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 * 5)  Use bridge crane and 2-ton hoist to remove top end assembly from filter housing and place it out of the immediate work area. 6)  Attach a lifting rig to U-bolts of cartridge cage assembly. 7)  Use bridge crane and 2-ton hoist to lift cartridge cage assembly while slowly rotating it to overcome O-ring resis- tance.  As assembly clears housing, attach lines to the assembly to control movement.  Lift assembly vertically and slowly to prevent damage.  Move assembly away from filter housing, lower to deck and remove hoist. * * d.  To install cartridge cage assembly: 1)  Check that O-rings on cartridge cage assembly are in their grooves and lightly lubricated with silicone-based lubricant.  Install new O-rings if dam- aged. 2)  Attach lifting rig to cartridge cage assembly U-bolts.  Use bridge crane with 2-ton hoist to lift assembly and guide it over filter housing. CAUTION Be careful not to damage 0-ring when installing cartridge assembly. 3)  Carefully lower assembly into the filter housing.  Rotate assembly slightly, if necessary, to get O-rings into filter housing without damage. 4)  Attach lifting rig to top end of assembly and lower onto filter housing. Insert tie rods into tie rod holes and align camlock connections. 3-22