(1) If tube assemblies (1 and 2) have not been removed, unscrew and remove tube assemblies (1 and 2). (2) Unscrew and remove elbows (3). (3) Unscrew    and    remove    cylinder    cap    and upper   head   subassembly   (8   though   18) from cylinder (23) and cartridge (19). (4) Remove  screws  (8),  gaskets  (9)  and  dust cover (7) from cap (11). (5) Remove   retaining   ring   (10)   and   separate upper head (13) from cap (11) Remove O- ring (12) from cap (11). (6) While   holding   the   upper   head   (13)   and head  spring  (18),  remove  retaining  screw (14) and disassemble upper perforator (15), lower    head    (16),    head    spring    (18)    and remove O-ring (J 7). NOTE Perform     step     (5)     below     only     when necessary to disassemble lower perforator (21). (7) Remove retainer screw (20), lower perforator     (21),     and     spacer     (22)     from cylinder (23). b. Cleaning  Refer to paragraph 6-3  a    for  general cleaning instructions. (1) Flush the cylinder clean with P-D-680, Type II, or equivalent. (2) Clean   the   upper   head   with   the   flushing agent. (3) Allow the cylinder, head and parts to air dry until odor of the flushing agent disappears. c. Inspection.  Inspect  each  part  as  per  paragraph 6-3.b. (1) Perforator    blades    (15    and    21)    for    any bending or dullness. (2) Spring (18) for breaks or set. d. Repair  or  Replacement    Repair  or  replacement as per paragraph 6-3.c. (1) Replace     a     damaged     cap     or     cylinder. Damaged threads may cause leakage. (2) Replace damaged or dull perforators Defective     perforators     will     not     puncture cartridge. (3) Replace a defective spring. (4) Replace all parts that are worn or damaged to   an   extent   that   will   impair   their   normal function. e. Assembly.      To   assemble   the   air    purification cylinder group, proceed as follows: (1) Assemble spacer (22) and lower perforator (21)  in  bottom  of  cylinder  (23)  with  screw (20) tightened securely. (2) To  assemble  upper  head  assembly  place O-ring  (17)  in  position  on  lower  head  (16) Place O-ring (12) in position on upper head (13)  Assemble  spring  (18)  and  lower  head (16)   on   upper   head   (13),   position   upper perforator (15) and secure with screw (12) (3) Install   this   assembled   group   of   parts   in cylinder  cap  (11)  and  install  retaining  ring (10) Attach cover (7) to cap (11) with screw gaskets (9) and screws (8) Do not install cartridge (19) into cylinder until  ready  for  use  Contamination  of  the cartridge   could   result   from   premature cartridge installation. (4) Install   cartridge   (19)   in   cylinder   (23)   and screw  the   upper   head   assembly   securely onto cylinder (23) hand tight (5) The upper  and  lower  mounting  brackets  (6 and    5)    are    supplied    with    a    dehydrator assembly.  Attach the brackets (6 and 5) to cylinder   (23)   until   ready   for   next   higher assembly. 6-8. CONTROL  PANEL ASSEMBLY, TYPE II (AIR/ OXYGEN) (See Figure 7-5)  The following paragraphs contain    disassembly,    cleaning,    inspection,    repair    or replacement  and  assembly  instructions  for  the  Type  II control panel assembly. a. Type   11   -   Air   section   of   the   Type   II   Control Panel. 6-9