14
Cousteau/ SEA First Stage Service & Repair Manual
© 2000 Aqua Lung America, Inc.
Table 1
Troubleshooting Guide
SYMPTOM
POSSIBLE CAUSE
TREATMENT
Restricted airflow/ high in-
1. Cylinder valve not completely opened.
1. Open valve, check fill pressure.
halation resistance through
entire system.
2. Cylinder valve requires service.
2. Connect to a different cylinder.
3. Filter(8d) is installed upside
3. Reinstall or replace filter with new
down or (5 or 8d) is contaminated.
as needed.
4. Insufficient intermediate pressure.
4. See below.
High or unstable intermediate
1. First-stage improperly adjusted.
1. Readjust adjustment screw(31).
pressure
2. HP seat(13) damaged or worn.
2. Replace HP seat.
3. Spring block O-ring(15) damaged
3. Replace spring block O-ring.
or worn.
4. Spring block(17) damaged.
4. Replace spring block.
5. Crown O-ring(12) damaged or worn.
5. Replace crown O-ring.
6. Sealing surface of HP crown(11)
6. Replace HP crown.
damaged.
7. Springblock springs(14a&14b)
7. Replace springblock springs.
weakened or damaged.
Low intermediate pressure
1. First-stage improperly adjusted.
1. Readjust adjustment screw(31).
2. Main spring(29) damaged.
2. Replace main spring.
3. Spring retainer(28 or 32) loose.
3. Tighten to 20
±
2 foot-lbs.
External air leakage
1. Spring retainer(28 or 32) loose.
1. Tighten to 20
±
2 foot-lbs.
(Immersion Test)
2. Diaphragm(26a) worn or damaged.
2. Replace diaphragm.
3. Diaphragm seating surface inside
3. Replace first stage body.
first stage body(10) damaged.
NOTE: This is a partial list of possible problems and recommended treatments. For
more information, refer to the second-stage troubleshooting guide, or contact the
Technical Services Department for assistance with problems not described here.
CAUTION: Recommended treatments which require disassembly of the regulator
must be performed during a complete overhaul, according to the prescribed proce-
dures for scheduled, annual service. Do not attempt to perform partial service.
