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Page Title: AFFF NITROGEN PRESSURE REGULATOR
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TM 07661B-14/1 APPENDIX A (3) UNPAINTED METAL SURFACES.  Clean all unpainted metal surfaces using dry cleaning solvent, Federal Specification  P-D-680.    Dry  parts  with  filtered,  low  pressure,  compressed  air  or  a  clean,  lint-free  cloth.    Do  not  dry bearings with compressed air or spin bearings While they are not lubricated. (4) PAINTED METAL SURFACES.  Clean painted, metal surfaces as follows: (a) Wash with mild soapwater solution and rinse with clear water. (b) Accumulations of dirt can be scrubbed off with a bristle brush that has been dipped in dry cleaning solvent, Federal Specification P-D-680.  Rinse part in clean solvent to remove remaining residue. (c) Dry parts with filtered, low pressure, compressed air or a clean lint-free cloth. b. Inspection.  Inspect all internal parts for pitting, corrosion, or other damage.  Inspect exterior parts, valve bodies, etc.  for internal wear, cracks, or damaged threads. c. Repair.  Any parts showing wear or damage, making the part unusable, should be replaced.  Replace all o-rings, packings, seals, seats and gaskets at assembly.  Replace any hardware items, nuts, bolts, etc.  with rounded corners, distortion or damaged threads. A 3-31.  AFFF NITROGEN PRESSURE REGULATOR.  (figure 3-16) a. Disassembly. (1) Clean outside of regular A 3-38 tor before disassembling, paragraph 3-30. (2) Remove seal wire (19), loosen lock nut (2), and loosen adjusting screw (1), releasing spring tension. (3) Put body of regulator in a vise with protective jaws.  Use care not to damage ports or machined surfaces. Using an adjustable wrench on hex of housing cap (3), turn the cap counterclockwise to remove it from the body. (4) Remove diaphragm assembly (8), adjusting springs (6, 7), and spring button (5) from housing cap. (5) Using  socket  wrench,  remove  nozzle  (10),  turning  it  counterclockwise  to  remove  it  from  threads  in  bore inside  body.    Lift  out  the  seat  assembly  (12)  and  valve  spring  (13).    Unscrew  seat  assembly  (12)  from  nozzle  (10). Remove and discard the nozzle gasket (11), gland (14), and friction washer (15). (6) Remove and discard the diaphragm slip ring (9). b. Assembly. (1) Be sure all parts are clean, dry and in serviceable condition before assembling. (2) Install new friction washer (15) in center counterbore inside body, followed by gland (14) and valve spring (13).  Put new nozzle gasket (11) on shoulder at base of threaded bore for nozzle inside the body.  Install seat assembly (12) into valve spring.  Install nozzle (10) and tighten securely. (3) Put new diaphragm slip ring (9) in groove on body. A 3-38

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