Aqua Lung EA-4500 LW 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 the Aqua Lung
Technical Service Department for assistance with problems not described in Table 1 & 2: Troubleshooting Guides.
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.
POSSIBLE CAUSE
1. High first stage MP, should be 145 (±5) PSI /
10 (± 0.3) BAR.
2.The MP seat (54) is dirty, worn or damaged.
3. The lever (48) is set too high.
4. The lever (48) is bent.
5. The valve seat (56) seating surface is damaged. 5. Replace the valve seat (56).
6. The spring (52) is worn or damaged.
7. The shuttle valve o-ring (51) is worn or damaged. 7. Replace the o-ring (51).
8. The shuttle valve (53) is damaged.
1. Low first stage MP, should be 145 (±5) PSI / 10
(± 0.3) BAR.
2. The lever (48) is set too low.
3. The lever (48) is bent or catching on the spindle
body (49).
4. The MP hose is clogged or obstructed.
5. The spring (52) is worn or damaged.
1.The MP hose (38) is loose or damaged.
2. The MP hose o-ring (21) is damaged.
1. The mouthpiece (61) is incorrectly fitted or
damaged.
2. The diaphragm (47) is damaged.
3. The exhaust valve (63) is damaged or
improperly seated.
4.The diaphragm (47) is improperly seated
in the box bottom (59).
5. The box bottom (59) is damaged.
6. The inlet fitting o-ring (19) is damaged.
TREATMENT
1.Refer to Table 1: Troubleshooting
Guide.
2. Clean or replace MP seat (54).
3. Reset valve seat (56) to preliminary
setting and repeat adjustment procedure.
4. Replace the lever (48).
6. Replace the spring (52).
8. Replace the shuttle valve (53).
1.Refer to Table 1: Troubleshooting
Guide.
2. Reset valve seat (56) to preliminary
setting and repeat adjustment procedure.
3. Replace the lever (48) or check it was
reassembled correctly.
4. Clean or replace the MP hose (38).
5. Replace the spring (52).
1. Re-tighten MP hose (38) at second
stage fitting or replace hose.
2. Replace the o-ring (21).
1. Refit or replace mouthpiece (61).
2. Replace the diaphragm (47).
3. Re-seat or replace the exhaust
valve (63).
4. Disassemble and properly reassemble
(check for distortion).
5. Check exhaust valve seating surface
and replace box bottom (59).
6. Replace the o-ring (19).
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