Attach new o-ring (6), on filter assembly
(5). Install filter assembly (5) into trap
Install reducing nipple (4), tubing adaptor
(3), tubing elbow (2) and adaptor (1).
Second Stage Trap Assembly (See Figure 8-22).
The following paragraphs contain disassembly, cleaning,
inspection, repair and replacement and assembly
instructions for the second stage trap assembly.
Disassembly. Disassemble the second stage
trap assembly only to the extent necessary to repair or
replace a defective part or parts.
Remove two tubing adaptors (1 and 2),
pipe tee (3), nipple (4), and reducing bushing (5), from
trap body (16).
Remove tubing elbow (6), check valve (7),
close nipple (8), reducer (9), elbow (10), street tee (11),
reducer (12) and adapter (13) from trap body (16).
Unscrew and remove trap filter assembly
(14) and o-ring packing (15) from trap body (16).
Cleaning. Refer to paragraph 6-3.a for general
Take care not to damage the fine mesh
Do not allow parts to remain in dry
cleaning solvents for extended periods
of time or rust spots may form.
Thoroughly wash filter screen in solvent,
per Federal Specification P-D-680, Type II.
Allow filters to air dry.
For best results, use ultrasonic cleaner,
NSN 4940-00-164-8977, (Table 2-1), to
clean filter screen.
Wipe out cavity of trap bodies with a lint-
free cloth dampened in solvent, per
Federal Specification P-D-680, Type II.
Allow bodies to air dry.
Inspection. Refer to paragraph 6-3.b for general
Check the filter screen for damage such
as breaks and plugging due to corrosion.
Check o-ring for deterioration, cuts, or
Repair or Replacement. Refer to paragraph 6-
3.c for general repair or replacement instructions.
Do not allow solder to foul filter screw
If screen is undamaged and screen-to-
screw solder joint is broken, use a gas
torch to silver solder screen to screw. Use
rosin residue remover to remove solder
flux residue oil, and residue from trap filter.
If filter screen is damaged, replace the trap
Replace damaged or defective fittings.
Replace a damaged or defective check
Assembly. To assemble the second stage trap
assembly, proceed as follows: (1) Assemble o-ring (15)
and trap filter (14) in top of trap body (16). Install adaptor
(13)in body (16).
Install reducing bushing (12) in body (16),
assemble street tee (11) on bushing (12).
Assemble elbow (10) to run on tee (11).
Assemble valve (7) to nipple (8), to
reducing bushing (9), and install bushing
(9) in branch of pipe tee (11). Assemble
elbow (6) to valve (7).
Install reducing bushing (5) in body,
assemble hex nipple (4) to pipe tee (3),
and install nipple (4) in bushing (5).
Assemble adaptors (1 and 2) to pipe tee
Third Stage Trap Assembly (See Figure 8-23).
The following paragraphs contain disassembly, cleaning.