Aqua Lung Legend LX Second Stage Technical Maintenance Manual page 12

12
SYMPTOM
Leakage or freeflow from second stage
Low purge or excessive work of breath-
ing (full cylinder)
Water entering second-stage
Table 1 - Troubleshooting Guide
POSSIBLE CAUSE
1. High first-stage intermediate pres-
sure. (should be 135±5 psi)
2. LP seat (26) damaged or worn.
3. Crown (21) adjusted incorrectly, lever
set too high
4. Lever (25) bent
5. Crown (21) sealing surface dam-
aged.
6. Poppet spring (11) damaged.
1. Low first-stage intermediate pres-
sure. (should be 135±5 psi)
2. Crown (21) adjusted incorrectly, lever
set too low.
3. Intermediate pressure hose (40)
clogged or obstructed.
4. Lever (25) bent
1. Hole in mouthpiece (12).
2. Demand diaphragm (7) damaged.
3. Exhaust valve (13) damaged.
4. Venturi lever o-ring (16) dirty, dam-
aged, or worn.
5. Diaphragm improperly seated be-
tween box bottom (29) and sealing
ring (5).
6. Box bottom damaged. (Check ex-
haust valve sealing surface.)
7. Inlet o-ring (17) damaged.
8. Valve spindle o-ring (20) worn or
damaged
Legend First Stage Service Manual
TREATMENT
1. Refer to first-stage Troubleshoot-
ing Guide.
2. Replace LP seat.
3. Reset crown preliminary set-
tings, and repeat Adjustment
Procedures.
4. Replace lever.
5. Replace crown.
6. Replace spring.
1. Refer to first-stage Troubleshoot-
ing Guide.
2. Reset crown to preliminary
settings and repeat Adjustment
Procedures .
3. Clean or replace hose.
4. Replace lever.
1. Replace mouthpiece.
2. Replace diaphragm.
3. Replace valve.
4. Disassemble and replace o-ring.
5. Remove front cover (3) and
properly reassemble sealing
ring with diaphragm (check for
distortion).
6. Disassemble and replace box
bottom
7. Replace o-ring.
8. Replace o-ring.