TM  10-8110-201-14&P (9) Place the ring (2) on the pressure control and  align  holes. (10) Install the cap screws (1) in the ring and tighten  them  securely. (11) Assemble  and  install  the  remaining  cycl- ing  valve  assembly  by  following  the  procedures  in (1) thru (10) above. 4-22. Pilot Valve. a. Testing. (1) Prepare the drum for filling (para 4-3 a). (2) Block the pressure control off the ground as shown in figure 4-12. (3) Remove the bottom plug (14, fig. 4-11) from the  pressure  control. (4) Connect a pressure gage that reads from 0 to 6 psi (0 to 0.42 kg/sq cm) to the pressure control (fig.  4-12). (5) Start filling the drum (para 4-3  b) and observe the pressure gage during the filling opera- tion. If the pressure gage reaches 5 psi (0.4 kg/sq cm) and the pressure control does not shut off, press the STOP button. Adjust the pilot valve assembly,  paragraph  b below. NOTE The pressure should reach a maximum of 5 psi (0.4 kg/sq cm) just as the wrinkles come out of the drum and it assumes a firm cylindrical shape. (6) If  the  pressure  control  shuts  off  before  the pressure  gage  reaches  4.5  psi  (0.32  kg/sq  cm),  ad- just  the  pilot  vale  assembly  (b below). b. Adjustment. (1) Remove the cap screws (1, fig. 4-13) from the pressure  control. (2) Remove the nuts (15) from the four screws (12) and remove the screws from the pressure con- trol. (3) Separate the housing bodies (11 and 16). (4) Loosen the nut as shown in A, figure 4-14 to allow turning of the valve stem as shown in B, figure 4-14. (5) Turn  the  valve  stem  clockwise  to  increase pressure;  counterclockwise  to  decrease  pressure. NOTE Turning the valve stem out 1/4 of a turn will change the pressure approximately 1 psi (0.07 kg/sq cm). (6) Tighten the nut to lock the valve stem. (7) Place  the  housing  bodies  together,  and  in- stall the capscrew, screw, and nuts by reversing the procedures in  (1) and (2) above.  Tighten  the nuts  to  20  foot-pounds  (2.77  m-kg)  torque. (8) Retest  the  pilot  valve  (a above). (9) Readjust and retest until pressure is 4.5 pounds  per  square  inch  (0.32  kg/sq  cm)  ±0.5 pounds-per square inch (0.04 kg/sq cm). (10) Perform the procedures in (1) thru (4) above and replace the preformed packings (14, fig. 4-13). (11) Perform  the  procedures  in  (7)  above. c. Removal and Disassembly. (1) Remove  the  capscrew  (1,  fig.  4-13),  from  the pressure   control. (2) Remove the nuts (15) from the four screws (12  and  18)  and  remove  the  screws  from  the pressure   control. (3) Separate the housing bodies (11 and 16) and stand  (17). (4) Remove the three screws (10) from the bellows  assembly  (4)  and  remove  the  bellows assembly from the housing body. (5) Remove nut (8) from valve stem (7). (6) Remove  the  preformed  packings  (2  and  3) and seal (5). (7) Grasp the threaded end of the valve stem (7), turn it clockwise and remove the valve stem from the bellows assembly. (8) Remove the retaining ring (6) and valve guide (9) from the valve stem. d.  Cleaning,  Inspection,  and  Repair. (1) Wash the bellows assembly parts in hot, mild  soap  and  water  solution  to  remove  any foreign  matter.  Allow  the  parts  to  dry. (2) Inspect  the  bellows  assembly  for  cracks  or breaks. (3) Inspect burred valve stem or damaged valve  stem  threads. (4) Replace  all  unserviceable  parts  as  authoriz- ed. e. Reassembly  and  Installation. (1) Install the valve guide (9, fig. 4-13) and re- taining ring (6) on valve stem (7). (2) Grasp the unthreaded end of the valve stem,  place  the  threaded  end  in  the  bellows 4-22