Cousteau/ SEA First Stage Service & Repair Manual
13
© 2000 Aqua Lung America, Inc.
6.
Repeat the adjustment procedure in step 4 to adjust the
Cousteau/ SEA first stage intermediate pressure to exactly
135 psi. Repeatedly purge the second stage or open and shut
the test gauge bleed valve at least 15 times to ensure that the
intermediate pressure locks up consistently and remains stable
at 135 (
±
5) psi, with no signs of creeping or fluctuation.
7.
Final Assembly – “DRY” Environmental Kit
a.
While the regulator is still pressurized with 2,500 – 3,000
psi, insert the stem of the piston(33) into the hex opening
of the adjustment screw.
b.
Lay the external diaphragm(36) inside the external dia-
phragm retainer(36), and tamp it down past the threads to
ensure that it seats evenly against the sealing surface.
c.
Mate the external diaphragm retainer onto the spring
retainer, and apply the retainer wrench (P/N 0812-47) to
tighten it clockwise until completely snug.
d.
Cycle the regulator to ensure that the intermediate pres-
sure has not dropped below 135 psi. If necessary, depres-
surize the regulator and disassemble the environmental kit
to reset the intermediate pressure, and repeat steps 6-7.
8.
After performing the overhaul and adjustment procedures
outlined in the Aqua Lung Service & Repair Manual provided
for the second stage, connect the first and second stage regu-
lators to perform the following tests:
9.
External Leak Test – Connect the regulator to a cylinder
which contains 2,500 - 3,000 psi, and open the cylinder valve
to pressurize the system. Submerge the cylinder and regulator
in a test tank of fresh water, and observe closely for up to one
minute to check for the formation of bubbles. If a steady
stream of bubbles is present, the system must be disassembled
at the source to check sealing surfaces, assembly sequence,
and component positioning in order to correct the problem(s).
NOTE: Extremely small leaks may be better detected by
applying a soap solution or Snoop™ to the leak area.
Bubble streams will indicate the source of the leak. Before
disassembling to correct any leaks, rinse the entire regulator
thoroughly with fresh water and blow out all residual mois-
ture with filtered, low-pressure (30 psi) air. Disassemble and
remedy the problem, referring to Table 1 – Troubleshooting.
10. Subjective Breathing Test – Depress the second stage purge to
ensure that the volume of airflow is adequate to clear the
second stage. Then, breathe deeply from the mouthpiece. A
properly serviced and adjusted regulator should deliver a
smooth, uninterrupted airflow upon deep inhalation; without
excessive effort, hesitation, or freeflow. If any abnormalities
or problems occur, refer to Table 1 – Troubleshooting.
This concludes the annual service procedures for the
Cousteau/ SEA First Stage.
