24
SEa lV2 Technical Maintenance Manual
Table 2: Troubleshooting guide Second Stage
SyMpToM
poSSiBlE cauSE
TREaTMEnT
Leakage or free flow from the
second stage
1. High first stage IP (should be 135
±20
psi).
1. Refer to First Stage Table 1: Trouble-
shooting Guide on p. 23
2. The LP seat (51) is worn or damaged.
2. Replace LP seat
3. The lever (45) is set too high.
3. Readjust locknut
4. The lever (45) is damaged.
4. Disassemble second stage
and replace lever
5. The crown sealing surface on the inlet
fitting (52) is worn or damaged.
5. Replace inlet fitting
6. The poppet (50) is worn or damaged.
6. Replace poppet and LP seat
7. The poppet spring (49) is damaged.
7. Replace poppet spring
low purge or labored breathing
(full cylinder)
1. Low IP (should be 135±20 psi).
1.Refer to Table 1: Troubleshooting
Guide First Stage, p. 23
2. The lever (45) is set too low.
2. Readjust locknut
3. The lever (45) is bent.
3. Disassemble the second stage and
replace lever
4. The poppet spring (49) is incorrectly
installed.
4. Disassemble the second stage and
reinstall poppet spring
5. The IP hose is clogged or obstructed.
5. Clean or replace hose
External air leak
(immersion Test)
1.The IP hose is loose.
1. Tighten hose to 45 in/lbs at second
stage fitting
2. The IP hose o-ring is damaged.
2. Disassemble and replace o-ring
Water entering second stage
1. The mouthpiece (58) has a hole.
1. Replace mouthpiece
2. The demand diaphragm (43) is damaged. 2. Replace demand diaphragm
3. The exhaust valve (56) is damaged.
3. Replace exhaust valve
4. The diaphragm is improperly seated
between the box bottom (54) and purge
cover ring (41).
4. Disassemble and properly
reassemble (check for distortion)
5. The box bottom (54) is damaged.
5. Check exhaust valve sealing
surface, replace box bottom
6. The inlet fitting o-ring (53) is damaged.
6. Disassemble and replace o-ring
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.
