Procedures; Disassembly - Aqua Lung MDB Technical Manual

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note: Before performing any disassembly, refer to the
exploded parts drawing, which references all mandatory
replacement parts. these parts should be replaced with
new and must not be reused under any circumstances
regardless of the age of the valve or how much use it has
received since it was last serviced.
cAutIoN: use only a plastic (pn 103102) or brass (pn
944022) o-ring removal tool when removing o-rings to
prevent damage to the sealing surface. Even a small
scratch across an o-ring sealing surface could result
in leakage. once an o-ring sealing surface has been
damaged, the part must be replaced with new. Do Not
use a dental pick or any other steel instrument..
90° cylinder Valve connector
maintenance Procedures

Disassembly

1. Remove the cylinder connector (59) from the BC connector by
unscrewing counterclockwise.
2. Remove the gasket (13) and closely inspect it for damage, if dam-
aged replace the gasket. If any debris is found in the groove, use a
clean cloth to remove. Examine the BC connector for any damage.
3. Use the o-ring removal tool (pn 944022) to remove o-ring (1)
from the valve reducing connector (2) and discard the o-ring.
4. Remove the retaining ring (12) using reversible circlip pliers (pn
111100) and discard the retaining ring. Remove the handwheel
(11) and o-ring (8) from the connector (7). Discard o-ring (8).
5. Secure the connector (7) using soft jaw pliers. Use a 5mm hex
key adapter (pn 8367A23) and 3/8" flex handle drive (pn 9-44363)
to turn the valve reducing connector (2) counterclockwise and re-
move it from the connector base (4). Remove the knurled nut (3)
from the valve reducing connector (2) and set aside for reuse.
note: Loctite 414 superbonder is used to hold this part in
place in addition to the torque applied during assembly.
6. Reinstall the valve reducing connector (2) into the connector
base (4). Using soft jaw pliers, hold the connector (7) above the
o-ring groove. Insert the 5mm hex key adapter (pn 8367A23) and
3/8" flex handle drive into the valve reducing connector (2), so that
it is positioned horizontally and to the right. Turn the 3/8" flex han-
dle drive counterclockwise to remove the connector base (4) from
the connector (7). Unthread the valve reducing connector (2) from
the connector base (4).
note: Loctite 414 superbonder is used to hold this part in
place in addition to the torque applied during assembly.
mDB technical manual