Aqua Lung SEA LV2 Technical Manual page 21

TABLE 2: TROUBLESHOOTING GUIDE SECOND STAGE
SYMPTOM
Leakage or free-flow from the
second stage
Low purge or labored breathing
(full cylinder)
External Air Leak
(Immersion Test)
Water entering second stage
NOTE: This is a partial list of problems and recommended treatments. For more information contact your Aqua Lung
Technical Service Department for assistance with problems not described in the Table 1 & 2: Troubleshooting Guides.
CAUTION: Recommended treatments which require disassembly of the SEA must be performed during a complete
overhaul, according to the prescribed procedures for scheduled service. Do not attempt to perform partial service.
POSSIBLE CAUSE
1. High first stage MP, should be 135 (±20) PSI
/ 9.3 (± 1.4) BAR.
2.The MP seat (55) is dirty, worn or damaged.
3. The lever (60) is set too high.
4. The lever (60) is bent.
5. The crown seating surface on the inlet fitting
(51) is worn or damaged.
6. The spring (57) is worn or damaged.
7. The poppet (56) is worn or damaged.
1. Low first stage MP, should be 135 (±20) PSI /
9.3 (± 1.4) BAR.
2. The lever (60) is set too low.
3. The lever (60) is bent.
4. The MP hose (11) is clogged or obstructed.
5. The spring (57) is worn or damaged.
1.The MP hose (11) is loose or damaged.
2. The MP hose o-ring (25) is damaged.
1. The mouthpiece (49 or 70) is incorrectly fitted
or damaged.
2. The diaphragm (48) is damaged.
3. The exhaust valve (53 or 68) is damaged
or improperly seated.
4.The diaphragm (48) is improperly seated
in the box bottom (54 or 69).
5. The box bottom (54 or 69) is damaged.
6. The inlet fitting o-ring (23) is damaged.
TREATMENT
1.Refer to Table 1: Troubleshooting
Guide.
2. Clean or replace MP seat (55).
3. Readjust locknut (62).
4. Replace the lever (60).
5. Replace the inlet fitting (51).
6. Replace the spring (57).
7. Replace the poppet (56).
1.Refer to Table 1: Troubleshooting
Guide.
2. Readjust locknut (62).
3. Replace the lever (60).
4. Clean or replace the MP hose (11).
5. Replace the spring (57).
1. Re-torque MP hose (11) at second
stage fitting or replace hose.
2. Replace the o-ring (25).
1. Refit or replace mouthpiece (49 or 70).
2. Replace the diaphragm (48).
3. Re-seat or replace the exhaust valve
(53 or 68).
4. Disassemble and properly reassemble
(check for distortion).
5. Check exhaust valve seating surface
or replace box bottom (54 or 69).
6. Disassemble and replace o-ring (23).
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