21
SYMPTOM
POSSIBLE CAUSE
TREATMENT
Leakage or free-flow from the
second stage
1. High first stage MP, should be 145 (±5) PSI /
10 (± 0.3) BAR.
1.
Refer to Table 1: Troubleshooting
Guide.
2.The MP seat (54) is dirty, worn or damaged.
2. Clean or replace MP seat (54).
3. The lever (48) is set too high.
3. Reset valve seat (56) to preliminary
setting and repeat adjustment procedure.
4. The lever (48) is bent.
4. Replace the lever (48).
5. The valve seat (56) seating surface is damaged. 5. Replace the valve seat (56).
6. The spring (52) is worn or damaged.
6. Replace the spring (52).
7. The shuttle valve o-ring (51) is worn or damaged. 7. Replace the o-ring (51).
8. The shuttle valve (53) is damaged.
8. Replace the shuttle valve (53).
Low purge or labored breathing
(full cylinder)
1. Low first stage MP, should be 145 (±5) PSI / 10
(± 0.3) BAR.
1.
Refer to Table 1: Troubleshooting
Guide.
2. The lever (48) is set too low.
2. Reset valve seat (56) to preliminary
setting and repeat adjustment procedure.
3. The lever (48) is bent or catching on the spindle
body (49).
3. Replace the lever (48) or check it was
reassembled correctly.
4. The MP hose is clogged or obstructed.
4. Clean or replace the MP hose (38).
5.
The spring (52) is worn or damaged.
5. Replace the spring (52).
External Air Leak
(Immersion Test)
1.The MP hose (38) is loose or damaged.
1. Re-tighten MP hose (38) at second
stage fitting or replace hose.
2. The MP hose o-ring (21) is damaged.
2. Replace the o-ring (21).
Water entering second stage
1. The mouthpiece (61) is incorrectly fitted or
damaged.
1. Refit or replace mouthpiece (61).
2. The diaphragm (47) is damaged.
2. Replace the diaphragm (47).
3. The exhaust valve (63) is damaged or
improperly seated.
3. Re-seat or replace the exhaust
valve (63).
4.The diaphragm (47) is improperly seated
in the box bottom (59).
4. Disassemble and properly reassemble
(check for distortion).
5. The box bottom (59) is damaged.
5. Check exhaust valve seating surface
and replace box bottom (59).
6. The inlet fitting o-ring (19) is damaged.
6. Replace the o-ring (19).
TABLE 2: TROUBLESHOOTING GUIDE SECOND STAGE
CAUTION:
Recommended treatments which require disassembly of this product must be performed during a complete
overhaul, according to the prescribed procedures for scheduled service. Do not attempt to perform partial service.
NOTE: This is a partial list of problems and recommended treatments. For more information contact the Aqua Lung
Technical Service Department for assistance with problems not described in
Table 1 & 2: Troubleshooting Guides.
