TM  5-4220-231-14&P 4.30    Check    Valve   rartridge (CRS). This   task   covers: Replace INITIAL  SETUP Tools Equipment Condition General Mechanics Tool   Kit Bleed    CRS O-ring    Installation     and    Removal Tool Ford   Wrench Materials/Parts Reference Valve,    Check    Cartridge 13229E4580 Para.     4-25,    General Soft   Goods    Kit,  CPV    13230E4946 Silicone    Compound (Item   9,  Appendix D) Nonionic    Detergent Solution (NID)   GP, (Item   17,  Appendix D) a. CHECK VALVE CARTRIDGE (1) Locate which one of  the    two    check cartridge valves on   the    manifold is   to be   removed. For   clarity,    the    following sketches in  both step a   and step b are   showing the   manifold without any external attached connections. The manifold does not need to be removed during these procedures. (2) Position a   wrench on   the check car- tridge valve    (1)   in  the    manifold (2), and turn    clockwise. (Valve has left hand threads). Remove, cut,   arid   dis- card O-ring    (4)   and the   backup ring (3). 1,3,4,5 2 51f Change 5 4-91