Aqua Lung S.E.A. LV-2 Technical Manual page 24

24
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
Table 2: Troubleshooting guide Second Stage
poSSiBlE cauSE
1. High first stage IP (should be 135±20
psi).
2. The LP seat (51) is worn or damaged.
3. The lever (45) is set too high.
4. The lever (45) is damaged.
5. The crown sealing surface on the inlet
fitting (52) is worn or damaged.
6. The poppet (50) is worn or damaged.
7. The poppet spring (49) is damaged.
1. Low IP (should be 135±20 psi).
2. The lever (45) is set too low.
3. The lever (45) is bent.
4. The poppet spring (49) is incorrectly
installed.
5. The IP hose is clogged or obstructed.
1.The IP hose is loose.
2. The IP hose o-ring is damaged.
1. The mouthpiece (58) has a hole.
2. The demand diaphragm (43) is damaged.
3. The exhaust valve (56) is damaged.
4. The diaphragm is improperly seated
between the box bottom (54) and purge
cover ring (41).
5. The box bottom (54) is damaged.
6. The inlet fitting o-ring (53) is damaged.
NOTE: this is a partial list of possible problems and recommended treatments.
For more information contact Aqua Lung technical Service Department for
assistance with problems not described here.
CAUTION:
Recommended treatments which require disassembly of the regu-
lator must be performed during a complete overhaul, according to the pre-
scribed procedures for scheduled, annual service. Do not attempt to perform
partial service.
SEa lV2 Technical Maintenance Manual
TREaTMEnT
1. Refer to First Stage Table 1: Trouble-
shooting Guide on p. 23
2. Replace LP seat
3. Readjust locknut
4. Disassemble second stage
and replace lever
5. Replace inlet fitting
6. Replace poppet and LP seat
7. Replace poppet spring
1.Refer to Table 1: Troubleshooting
Guide First Stage, p. 23
2. Readjust locknut
3. Disassemble the second stage and
replace lever
4. Disassemble the second stage and
reinstall poppet spring
5. Clean or replace hose
1. Tighten hose to 45 in/lbs at second
stage fitting
2. Disassemble and replace o-ring
1. Replace mouthpiece
2. Replace demand diaphragm
3. Replace exhaust valve
4. Disassemble and properly
reassemble (check for distortion)
5. Check exhaust valve sealing
surface, replace box bottom
6. Disassemble and replace o-ring