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)  Install hex nuts on tie rods and torque evenly to 10 lb/ft. 6)  Connect camlock coupling. 7)  Close valve RO8. 8)  Return R04 to service position. 7 Cartridge Filter Check cartridge filter element for cracks, Cracks or leaks in Element leaks, and other damage.  If necessary repair cartridge filter element. or replace as follows: NOTE To replace cartridge filter on filter element you will need: 12 new filter elements (P/N 52088) 1 set of socket wrenches and a torque wrench 12 upper seals (spare) (Hydraunatics #52088) 12 lower seals (spare) (Hydrautics #52084) 3 0-rings (spare) (Parker 2-452C557-70) 1 Stiff bristle brush and clean, lint-free cloths. Clean workplace. * * a.  Invert cartridge cage assembly and stand on three U-Bolts. * * b.  Remove three 5/16 hex nuts, six washers , and three springs.  Lift and lower spider from tie rods. CAUTION Do not remove upper and lower seals.  If seals come loose, be sure to install upper seals on upper spider and lower seals on lower spider.  Failure to install seals cor- rectly may result in water leakage. 3-23