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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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