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455 Balanced Regulator Installation
O-ring at the regulator end should be cleaned
and inspected whenever the bent tube is
removed.
Replace the bent tube if it is excessively
scratched, dented or compressed deeper than 1/8
inch (3.18 mm). If the helmet has been used for
burning jobs, carefully check for erosion of the
metal or severe corrosion. Replace if any ero-
sion is present or integrity is in question. Keep in
mind the bent tube is a principle component that
routes breathing gas to the regulator system.
If this maintenance is during an annual
overhaul, replace the Teflon
side block end of the bent tube and the
O-ring at the demand regulator inlet side of
NOTE
the bent tube.
Before beginning the first step, ensure that
the jam nut, located on the inlet nipple, is
turned entirely in towards the regulator
body and away from the bent tube. If it is
NOTE
not, rotate jam nut to this correct starting
position for bent tube installation.
2. Lightly lubricate the O-ring on the bent tube
assembly.
3. Inspect the regulator mount nut for
contaminants and damage. Use a tooth brush
to clean threads as needed. Lightly lubricate the
regulator mounting tube threads and the sealing
O-ring with Christo-Lube
© MMXXI Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 210607001
®
O-ring at the
.
®
Bent Tube Assembly and Regulator Installation
4. Install the sealing O-ring, then thread the
regulator mount nut onto the regulator, finger
tight ONLY.
5. Ensure that the Teflon
engage the bent tube nut to the side block fully
until it is hand tight. You may need to gently rock
the regulator body and/or the bent tube to fully
engage the side block nut.
6. Thread the large nut on the bent tube
assembly onto the inlet nipple two to three
threads.
7. Using a torque wrench, tighten the bent
tube mount nut onto the Side Block. ALWAYS
REFERENCE Appendix Contents, Torque Specs
starting on page APNDX-19 in the modular manual to
confirm correct torque
8. Next, fully engage (clockwise) the large nut on
the bent tube into the bent tube adapter hand
tight until resistance is felt. Do not tighten further.
This will ensure the nut is bottomed on the
shoulder of the bent tube.
9. Engage the jam nut fully against the large nut
on the bent tube.
10. Using a 7/8 inch open end wrench hold the
large nut on the regulator end of the bent tube.
Use a torque wrench and torque the jam nut
against the bent tube mount nut to lock it in
place. ALWAYS REFERENCE Appendix Contents,
Torque Specs starting on page APNDX-19 in the
modular manual to confirm correct torque.
O-ring is in place and
®
9
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