TM 10-8110-201-14&P (2) Install  a  serviceable  preformed  packing  (5) on the valve stem. (3) Replace any damaged or defective part. d. Reassembly. (1) If removed, insert pin ( 12, fig 4-6) in valve stem (9). Install seat ring (10) and valve stem (9) in the coupler valve body (14). (2) Install  valve  stem  rotor  (8),  spacer  (7),  and retaining ring (6). (3) Install  valve  stem  (4)  and  preformed  pack- ing (5). (4) Apply  anti-seize  compound  (item  2,  App. D) to the retainer (3) and install it in the coupler valve assembly. (5) Install handwheel (2) and secure with nut (1). e. Installation. NOTE Remove dust cap from check valve assembly adapter. (1) Connect  coupler  valve  assembly  to  check valve  assembly  adapter. (2) Connect  hose  assembly  (fig.,  4-2)  to  coupler valve  assembly. (3) Turn  handwheel  (fig.  4-2)  counterclock- wise  to  open  coupler  valve  assembly. 4-15. Check Valve Assembly Adapter. a. Removal. Start  the  pump  assembly  and  pro- ceed  as  follows: (1) Dispense  the  contents  from  the  drum  (para 2-3). (2) Disconnect  coupler  valve  assembly  from check  valve  assembly  adapter. (3) Remove the chain and dust cap from the check  valve  assembly  adapter. (4) Remove the check valve assembly adapter on  the  drum. b. Disassembly. (1) Unscrew and remove spring retainer (4, fig.  4-7),  spring  (5)  and  spring  housing  (6)  using  spring retainer  wrench  (fig.  4-7.1)  Turn  counterclockwise  to remove  spring  retainer. (2) Remove pin guide (1), washer (2), and gas- ket  (3)  from  spring  housing  (6). (3) If necessary, pull dust cap (7) free from the adapter  body  (8). c. Repair. (1) Inspect parts for signs of damage or defects. (2) Replace any unserviceable parts. (3) Replace  all  gaskets. d. Reassembly. (1) If removed, install dust cap (7, fig. 4-7) on adapter  body  (8). (2) Install guide pin (1), and washer (2) and gasket (3) on spring housing (6). (3) Insert spring (5) in spring housing (6) and install spring retainer (4) using spring retainer wrench (fig.  4-7.1).  Turn  clockwise  to  install  spring  retainer. (4) Insert  assembled  spring  housing  into  the adapter  body  (8)  and  install  spring  retainer. e. Installation. (1) Apply  a  coating  of  anti-seize  compound (item 2, App. D) to threads of a serviceable check valve assembly adapter, and install it in the drum (fuel drum only). (2) Install the check valve assembly adapter in the  drum. (3) Install the chain and dust cap on the check valve  assembly  adapter. (4) Connect the coupler valve assembly to the check  valve  assembly  adapter. 4-16. Repair Kits, Type I and Type II. These repair kits are provided for emergency repair of  the  fabric  drum  casing  by  the  operating  personnel. a. Refer to paragraphs 3-7 and 3-8 for emergency repair  instructions  of  the  drum  casing. b. Refer  to  paragraphs  3-13  and  3-14  for  inspec- tion  and  replacement  of  the  repair  kits. Change  9 4-13